Query: aspherical lens canon

title: Canon EF-M 55-200mm f/4.5-6.3 Image Stabilization STM Lens (Black) (Renewed)
text: Product Description The Canon EF-M 55-200mm f/4.5-6.3 IS STM Zoom Lens is compatible with Canon EOS M series digital cameras and offers an extended zoom range perfect for shooting architecture, portraits and more. The advanced 5-group optical system delivers ?superb image quality with impressive Image Stabilization technology to help capture still and motion photography handheld. The speedy STM focusing system provides fast, smooth and quiet operation. Manual focus lets you make fine adjustments on the fly, and is easily accessed with the lens's AF+MF mode. Delivering stellar image quality in a lightweight, compact and easy-to-use package, the EF-M 55-200mm f/4.5-6.3 IS STM is an ideal lens to add to an EOS M series digital camera. Product Description The Canon EF-M 55-200mm f/4.5-6.3 IS STM Zoom Lens is compatible with Canon EOS M series digital cameras and offers an extended zoom range perfect for shooting architecture, portraits and more. The advanced 5-group optical system delivers ?superb image quality with impressive Image Stabilization technology to help capture still and motion photography handheld. The speedy STM focusing system provides fast, smooth and quiet operation. Manual focus lets you make fine adjustments on the fly, and is easily accessed with the lens's AF+MF mode. Delivering stellar image quality in a lightweight, compact and easy-to-use package, the EF-M 55-200mm f/4.5-6.3 IS STM is an ideal lens to add to an EOS M series digital camera.

title: Canon EF-S 10-18mm f/4.5-5.6 IS STM Lens (Renewed)
text: Product Description Canon EF-S 10-18mm f/4.5-5.6 IS STM Lens Product Description Canon EF-S 10-18mm f/4.5-5.6 IS STM Lens

title: Canon EF 17-40mm F/4 L USM Lens 8806A002 - (Renewed)
text: Product Description Canon Certified Refurbished EF 17-40mm f/4L USM EF Lens For Professional and High Amateur SLR EOS Camera Users Wide zoom lens for digital EOS SLR cameras Ultra wide lens for analogue EOS SLR cameras With superb optical performance, super fast AF, dust and moisture seals and a close focusing distance of just 28cm, this lightweight, wide-angle zoom is especially suitable or APS-C and APS-H cameras. While it is an excellent lens when used with an analogue SLR camera, the EF17-40mm f/4L USM is especially well suited for digital SLR cameras with an imaging sensor size smaller than the 35mm format. Indeed on such digital SLR cameras these focal lengths can give an angle of view approximately equivalent to that of a 28-70mm lens used on a 35mm camera, which makes it the ideal standard zoom lens. Features Superb optical performance throughout the zoom range. Fastest AF speed within its class (same as the EF16-35 f/2.8L USM) Highly dust and moisture resistant 28cm minimum focusing distance at all focal lengths Superior optical performance The EF17-40mm f/4L USM has 12 lens elements arranged in 9 groups. Super Spectra Coating on the elements ensures excellent colour balance and minimises ghosting and flare. To provide superb image quality over a 17-40mm zoom range the lens uses three aspheric elements of two different types, while Super UD (Ultra-low Dispersion) glass is used to prevent the chromatic aberrations that often can degrade the subject edge clarity. Extensive set of high-end features The Auto-focus works silently and quickly thanks to a fast central processing unit with an improved AF algorithm. You can override AF mode with manual focus should you wish. Controlled by an electromagnetic diaphragm, it's USM circular aperture can achieve a more attractive appearance to out of focus background areas in a picture. Minimum focusing distance is just 28mm throughout the entire zoom range. The front of the lens does not rotate as you focus. This means, for example, that polarising filters still function effectively as you zoom in and out. At the rear of the lens there's a drop-in gelatin filter holder. Highly resistant to moisture and dust and ideally suited for use in harsh environments. Technical Specifications Focal length : 17-40mm Maximum aperture : 1:4 Lens construction : 12 elements in 9 groups Diagonal angle of view : 104 to 57 degrees (at 30 feet) Focus adjustment : Inner focusing system with USM Closest focusing distance : 0.9 feet Zoom system : Rotating type Filter size : 77mm Dimensions : 3.3 inches in diameter, 3.8 inches long Weight : 1.1 pounds Read more 

title: Canon EF-S 10-18mm f/4.5-5.6 IS STM Lens (Cerified Renewed)
text: Product Description The EF-S 10-18mm f/4.5-5.6 IS STM lens combines optical excellence with cutting-edge performance, providing an ultra-wide angle of view in a compact, portable package, perfect for EOS cameras with an APS-C sensor. It has a 4 group optical zoom system and includes a large-diameter element, an aspherical lens element, a UD lens element and enhanced lens coatings for high-contrast, high-resolution images with minimal glare and aberration. A circular, 7-blade aperture helps ensure fine background blur and the Canon Optical Image Stabilizer system provides up to four equivalent stops of shake correction. The lens has a stepping motor (STM) and a refined focus mechanism for smooth and continuous AF during video recording. It also has a rear focusing system, plus a high speed CPU and improved AF algorithm for high-speed AF; and offers full-time manual focus for quick adjustments. The EF-S 10-18mm f/4.5-5.6 IS STM delivers reliable, speedy and quiet wide-angle performance, making it an ideal lens for everyday photography, travel, stills and video recording. Product Description The EF-S 10-18mm f/4.5-5.6 IS STM lens combines optical excellence with cutting-edge performance, providing an ultra-wide angle of view in a compact, portable package, perfect for EOS cameras with an APS-C sensor. It has a 4 group optical zoom system and includes a large-diameter element, an aspherical lens element, a UD lens element and enhanced lens coatings for high-contrast, high-resolution images with minimal glare and aberration. A circular, 7-blade aperture helps ensure fine background blur and the Canon Optical Image Stabilizer system provides up to four equivalent stops of shake correction. The lens has a stepping motor (STM) and a refined focus mechanism for smooth and continuous AF during video recording. It also has a rear focusing system, plus a high speed CPU and improved AF algorithm for high-speed AF; and offers full-time manual focus for quick adjustments. The EF-S 10-18mm f/4.5-5.6 IS STM delivers reliable, speedy and quiet wide-angle performance, making it an ideal lens for everyday photography, travel, stills and video recording.

title: Canon 50mm f/2.8L Macro - Tilt-Shift DSLR Lens

title: Canon 9522B002, EF-S 24 mm f/2,8 STM lente
text: Descripción del producto Lente de montaje EF-S/formato APS-C de 38 mm (equivalente a 35 mm) un elemento asférico optimizado revestimientos de lente STM AF motor soporta película Servo AF mecanismo de apertura de unidad Micro-Stepping a tiempo completo enfoque manual anulación de diafragma redondeado de 7 hojas diseño delgado mide menos de 1 grosor. Descripción del producto Lente de montaje EF-S/formato APS-C de 38 mm (equivalente a 35 mm) un elemento asférico optimizado revestimientos de lente STM AF motor soporta película Servo AF mecanismo de apertura de unidad Micro-Stepping a tiempo completo enfoque manual anulación de diafragma redondeado de 7 hojas diseño delgado mide menos de 1 grosor.

title: Canon EF-M 11-22mm f/4-5.6 STM Lens, Black - 7568B002
text: Product Description Product Description The Canon EF-M 11– 22 F/4– 5.6 is stm wide angle zoom lens is an excellent companion for your EOS M series digital camera. Offering a wide angle of view, it's an excellent lens for taking group photos in tight spaces and landscapes. Built-in image stabilization helps enhance performance, even in low-light situations, and is especially effective when capturing HD movies thanks to the lens's dynamic is. Specialized Canon optics help ensure high-resolution, sharp photos and movies. A refined, quiet autofocus system helps maintain focus with extraordinary speed, helping to ensure sharp photographs and HD movies.&Nbsp; features: 18 - 35 mm comparable focal length on a APS-C format camera.Wide-angle zoom lens for EOS M series digital cameras with optical image Stabilizer for up to three equivalent stops of shake correction.Lens retraction mechanism shortens the length of the lens and a compact, lightweight design allows easy portability.Rear focus system and built-in stepping motor (STM) help provide smooth and quiet continuous autofocus when shooting video with an EOS M series digital camera.Dynamic is (movie shooting mode only) helps deliver a wide image stabilization correction range, making it ideal for shooting while walking.Two aspheric lens elements and one UD lens element deliver superb image quality from the center to the periphery.Circular aperture (7 blades) helps deliver beautiful, soft backgrounds.Full-time manual focus allows manual focus adjustment after auto focusing.Minimum focusing distance: 5.9 in/0.15M.Maximum magnification of 0.30x at the telephoto end. From the Manufacturer EF-M 11–22mm f/4–5.6 IS STM Compact, versatile, speedy and affordable, the new EF-M 11–22 f/4–5.6 IS STM is a terrific complement to an EOS M series digital camera. Offering a wide angle of view, it's an excellent choice whether taking group photos in tight spaces, seeking out the perfect landscape or as an all-around walk-around lens. Built-in Image Stabilization helps enhance performance, even in low-light situations, and is especially effective when capturing HD movies thanks to the lens's Dynamic IS. Specialized Canon optics help ensure high-resolution, sharp photos and movies. A refined, quiet autofocus system helps maintain focus with extraordinary speed, helping to ensure sharp photographs and HD movies. With its remarkable combination of optical excellence and refined performance, all in a sleek package that's easy to bring most anywhere, the EF-M 11–22 f/4–5.6 IS STM is a stellar companion to an EOS M series digital camera. Specifications Focal Length & Maximum Aperture: 11–22mm f/4–5.6 Lens Construction: 12 elements in 9 groups Diagonal Angle of View: 102°10'–63°30' Focus Adjustment: AF with full-time manual Closest Focusing Distance: 0.49 ft./0.15m Filter Size: 2.2 in./55mm diameter Max. Diameter x Length, Weight: Approx. 2.4 x 2.3 in., approx. 7.8 oz. / 60.9 x 58.2mm, approx. 220g Sample Image Click here for larger image MTF Chart Product Description Product Description The Canon EF-M 11– 22 F/4– 5.6 is stm wide angle zoom lens is an excellent companion for your EOS M series digital camera. Offering a wide angle of view, it's an excellent lens for taking group photos in tight spaces and landscapes. Built-in image stabilization helps enhance performance, even in low-light situations, and is especially effective when capturing HD movies thanks to the lens's dynamic is. Specialized Canon optics help ensure high-resolution, sharp photos and movies. A refined, quiet autofocus system helps maintain focus with extraordinary speed, helping to ensure sharp photographs and HD movies.&Nbsp; features: 18 - 35 mm comparable focal length on a APS-C format camera.Wide-angle zoom lens for EOS M series digital cameras with optical image Stabilizer for up to three equivalent stops of shake correction.Lens retraction mechanism shortens the length of the lens and a compact, lightweight design allows easy portability.Rear focus system and built-in stepping motor (STM) help provide smooth and quiet continuous autofocus when shooting video with an EOS M series digital camera.Dynamic is (movie shooting mode only) helps deliver a wide image stabilization correction range, making it ideal for shooting while walking.Two aspheric lens elements and one UD lens element deliver superb image quality from the center to the periphery.Circular aperture (7 blades) helps deliver beautiful, soft backgrounds.Full-time manual focus allows manual focus adjustment after auto focusing.Minimum focusing distance: 5.9 in/0.15M.Maximum magnification of 0.30x at the telephoto end. From the Manufacturer EF-M 11–22mm f/4–5.6 IS STM Compact, versatile, speedy and affordable, the new EF-M 11–22 f/4–5.6 IS STM is a terrific complement to an EOS M series digital camera. Offering a wide angle of view, it's an excellent choice whether taking group photos in tight spaces, seeking out the perfect landscape or as an all-around walk-around lens. Built-in Image Stabilization helps enhance performance, even in low-light situations, and is especially effective when capturing HD movies thanks to the lens's Dynamic IS. Specialized Canon optics help ensure high-resolution, sharp photos and movies. A refined, quiet autofocus system helps maintain focus with extraordinary speed, helping to ensure sharp photographs and HD movies. With its remarkable combination of optical excellence and refined performance, all in a sleek package that's easy to bring most anywhere, the EF-M 11–22 f/4–5.6 IS STM is a stellar companion to an EOS M series digital camera. Specifications Focal Length & Maximum Aperture: 11–22mm f/4–5.6 Lens Construction: 12 elements in 9 groups Diagonal Angle of View: 102°10'–63°30' Focus Adjustment: AF with full-time manual Closest Focusing Distance: 0.49 ft./0.15m Filter Size: 2.2 in./55mm diameter Max. Diameter x Length, Weight: Approx. 2.4 x 2.3 in., approx. 7.8 oz. / 60.9 x 58.2mm, approx. 220g Sample Image Click here for larger image MTF Chart

title: Canon EF-S 10-18mm f/4.5-5.6 IS STM Lens
text: Product Description Product Description The EF-S 10-18mm f 4.5-5.6 IS STM lens combines optical excellence with cutting-edge performance, providing an ultra-wide angle of view in a compact, portable package, perfect for EOS cameras with an APS-C sensor. It has a 4 group optical zoom system and includes a large-diameter element, an aspherical lens element, a UD lens element and enhanced lens coatings for high-contrast, high-resolution images with minimal glare and aberration. A circular, 7-blade aperture helps ensure fine background blur and the Canon Optical Image Stabilizer system provides up to four equivalent stops of shake correction. The lens has a stepping motor STM and a refined focus mechanism for smooth and continuous AF during video recording. It also has a rear focusing system, plus a high speed CPU and improved AF algorithm for high-speed AF and offers full-time manual focus for quick adjustments. The EF-S 10-18mm f 4.5-5.6 IS STM delivers reliable, speedy and quiet wide-angle performance, making it an ideal lens for everyday photography, travel, stills and video recording. From the Manufacturer EF-S 10–18mm f/4.5–5.6 IS STM The EF-S 10–18mm f/4.5–5.6 IS STM lens combines optical excellence with cutting-edge performance, providing an ultra-wide angle of view in a compact, portable package, perfect for EOS cameras with an APS-C sensor. It has a 4 group optical zoom system and includes a large-diameter element, an aspherical lens element, a UD lens element and enhanced lens coatings for high-contrast, high-resolution images with minimal glare and aberration. A circular, 7-blade aperture helps ensure fine background blur and the Canon Optical Image Stabilizer system provides up to four equivalent stops of shake correction. The lens has a stepping motor (STM) and a refined focus mechanism for smooth and continuous AF during video recording. It also has a rear focusing system, plus a high speed CPU and improved AF algorithm for high-speed AF; and offers full-time manual focus for quick adjustments. The EF-S 10–18mm f/4.5–5.6 IS STM delivers reliable, speedy and quiet wide-angle performance, making it an ideal lens for everyday photography, travel, stills and video recording. Specifications Focal Length & Maximum Aperture: 10–18mm 1:4.5–5.6 Lens Construction: 14 elements in 11 groups Diagonal Angle of View: 107°30' – 74°20' Focus Adjustment: Rear focus system Closest Focusing Distance: 0.72 ft. / 0.22m Filter Size: 67mm diameter Max Diameter x Length, Weight: 2.9 x 2.8 inches, approx. 8.5 oz. / 74.6 x 72.0mm, approx. 240g MTF Charts Product Description Product Description The EF-S 10-18mm f 4.5-5.6 IS STM lens combines optical excellence with cutting-edge performance, providing an ultra-wide angle of view in a compact, portable package, perfect for EOS cameras with an APS-C sensor. It has a 4 group optical zoom system and includes a large-diameter element, an aspherical lens element, a UD lens element and enhanced lens coatings for high-contrast, high-resolution images with minimal glare and aberration. A circular, 7-blade aperture helps ensure fine background blur and the Canon Optical Image Stabilizer system provides up to four equivalent stops of shake correction. The lens has a stepping motor STM and a refined focus mechanism for smooth and continuous AF during video recording. It also has a rear focusing system, plus a high speed CPU and improved AF algorithm for high-speed AF and offers full-time manual focus for quick adjustments. The EF-S 10-18mm f 4.5-5.6 IS STM delivers reliable, speedy and quiet wide-angle performance, making it an ideal lens for everyday photography, travel, stills and video recording. From the Manufacturer EF-S 10–18mm f/4.5–5.6 IS STM The EF-S 10–18mm f/4.5–5.6 IS STM lens combines optical excellence with cutting-edge performance, providing an ultra-wide angle of view in a compact, portable package, perfect for EOS cameras with an APS-C sensor. It has a 4 group optical zoom system and includes a large-diameter element, an aspherical lens element, a UD lens element and enhanced lens coatings for high-contrast, high-resolution images with minimal glare and aberration. A circular, 7-blade aperture helps ensure fine background blur and the Canon Optical Image Stabilizer system provides up to four equivalent stops of shake correction. The lens has a stepping motor (STM) and a refined focus mechanism for smooth and continuous AF during video recording. It also has a rear focusing system, plus a high speed CPU and improved AF algorithm for high-speed AF; and offers full-time manual focus for quick adjustments. The EF-S 10–18mm f/4.5–5.6 IS STM delivers reliable, speedy and quiet wide-angle performance, making it an ideal lens for everyday photography, travel, stills and video recording. Specifications Focal Length & Maximum Aperture: 10–18mm 1:4.5–5.6 Lens Construction: 14 elements in 11 groups Diagonal Angle of View: 107°30' – 74°20' Focus Adjustment: Rear focus system Closest Focusing Distance: 0.72 ft. / 0.22m Filter Size: 67mm diameter Max Diameter x Length, Weight: 2.9 x 2.8 inches, approx. 8.5 oz. / 74.6 x 72.0mm, approx. 240g MTF Charts

title: Canon EF 35mm f/2 IS USM Wide-Angle Lens
text: Product Description Product Description The Canon EF 35mm f/2 IS USM wide-angle lens is incredibly bright and offers image stabilization, superb image quality and construction perfect for use on any EOS digital camera. With a redesigned mechanical and optical structure, this lens features a GMo a spherical lens element for high image quality with improved performance in the periphery. It incorporates a rear focus system and ring-type USM for faster, more precise autofocus performance. Full-time manual focus enables manual focusing while in AF mode, a micro-stepping drive provides quieter operation and a low speed focus drive delivers optimal results for video shooting. Canon Optical Image Stabilizer system delivers the equivalent effect of 4 stops, can detect normal shooting or panning, and automatically switches to optimal IS mode. Compact and lightweight, this lens has an 8-blade circular aperture diaphragm for soft backgrounds plus optimized lens coatings for minimized ghosting and flare. Filter size: 67 mm. From the Manufacturer EF 35mm f/2 IS USM A modern day update to a versatile, compact and lightweight wide-angle lens, the EF 35mm f/2 IS USM is incredibly bright and offers image stabilization, superb image quality and construction perfect for use on any EOS digital camera. With a redesigned mechanical and optical structure, the EF 35mm f/2 IS USM features a GMo aspherical lens element for high image quality with improved performance in the periphery. It incorporates a rear focus system and ring-type USM for faster, more precise autofocus performance. Full-time manual focus enables manual focusing while in AF mode, a micro-stepping drive provides quieter operation and a low speed focus drive delivers optimal results for video shooting. Canon Optical Image Stabilizer system delivers the equivalent effect of 4 stops and can detect normal shooting or panning, and automatically switches to the optimal IS mode. Compact and lightweight, the EF 35mm f/2 IS USM has an 8-blade circular aperture diaphragm for soft backgrounds, a minimum focusing distance of 0.79 ft./0.24m, plus optimized lens coatings for minimized ghosting and flare. Specifications Focal Length & Maximum Aperture: 35mm 1:2 Lens Construction: 10 elements in 8 groups Diagonal Angle of View: 63º Focus Adjustment: Rear focusing system Closest Focusing Distance: 0.79 ft. / 0.24m Filter Size: 67mm Max. Diameter x Length, Weight: 3.1 x 2.5 inches, 11.8oz. / 77.9 x 62.6mm, 335g Sample Image Click here for larger image MTF Charts Product Description Product Description The Canon EF 35mm f/2 IS USM wide-angle lens is incredibly bright and offers image stabilization, superb image quality and construction perfect for use on any EOS digital camera. With a redesigned mechanical and optical structure, this lens features a GMo a spherical lens element for high image quality with improved performance in the periphery. It incorporates a rear focus system and ring-type USM for faster, more precise autofocus performance. Full-time manual focus enables manual focusing while in AF mode, a micro-stepping drive provides quieter operation and a low speed focus drive delivers optimal results for video shooting. Canon Optical Image Stabilizer system delivers the equivalent effect of 4 stops, can detect normal shooting or panning, and automatically switches to optimal IS mode. Compact and lightweight, this lens has an 8-blade circular aperture diaphragm for soft backgrounds plus optimized lens coatings for minimized ghosting and flare. Filter size: 67 mm. From the Manufacturer EF 35mm f/2 IS USM A modern day update to a versatile, compact and lightweight wide-angle lens, the EF 35mm f/2 IS USM is incredibly bright and offers image stabilization, superb image quality and construction perfect for use on any EOS digital camera. With a redesigned mechanical and optical structure, the EF 35mm f/2 IS USM features a GMo aspherical lens element for high image quality with improved performance in the periphery. It incorporates a rear focus system and ring-type USM for faster, more precise autofocus performance. Full-time manual focus enables manual focusing while in AF mode, a micro-stepping drive provides quieter operation and a low speed focus drive delivers optimal results for video shooting. Canon Optical Image Stabilizer system delivers the equivalent effect of 4 stops and can detect normal shooting or panning, and automatically switches to the optimal IS mode. Compact and lightweight, the EF 35mm f/2 IS USM has an 8-blade circular aperture diaphragm for soft backgrounds, a minimum focusing distance of 0.79 ft./0.24m, plus optimized lens coatings for minimized ghosting and flare. Specifications Focal Length & Maximum Aperture: 35mm 1:2 Lens Construction: 10 elements in 8 groups Diagonal Angle of View: 63º Focus Adjustment: Rear focusing system Closest Focusing Distance: 0.79 ft. / 0.24m Filter Size: 67mm Max. Diameter x Length, Weight: 3.1 x 2.5 inches, 11.8oz. / 77.9 x 62.6mm, 335g Sample Image Click here for larger image MTF Charts

title: Canon Cameras US 6310B002 EF 40mm f/2.8 STM Lens - Fixed Black
text: Product Description A unique and indispensable addition to Canon’s series of EF lenses, the new EF 40mm f/2.8 STM offers an ultra-slim and lightweight design. Incredibly compact in size, the EF 40mm f/2.8 STM delivers high image quality from the center to the periphery thanks to its advanced lens configuration including an aspherical element, a bright 2.8 aperture, and optimized coatings that minimize ghosting and flare while providing exceptional color balance. The EF 40mm f/2.8 STM’s unobtrusive design helps the photographer avoid overwhelming their subjects with a large lens and to remain discreet in sensitive shooting situations with no compromise in performance. Its diminutive design is complemented by features such as a newly developed stepping motor for smooth and quiet continuous AF while capturing video with the Canon EOS Rebel T4i DSLR, a circular aperture (7 blades) for beautiful soft-focus backgrounds, and a short minimum focusing distance of only 0.98 feet/0.30 meters. 1 Year Warranty Product Description A unique and indispensable addition to Canon’s series of EF lenses, the new EF 40mm f/2.8 STM offers an ultra-slim and lightweight design. Incredibly compact in size, the EF 40mm f/2.8 STM delivers high image quality from the center to the periphery thanks to its advanced lens configuration including an aspherical element, a bright 2.8 aperture, and optimized coatings that minimize ghosting and flare while providing exceptional color balance. The EF 40mm f/2.8 STM’s unobtrusive design helps the photographer avoid overwhelming their subjects with a large lens and to remain discreet in sensitive shooting situations with no compromise in performance. Its diminutive design is complemented by features such as a newly developed stepping motor for smooth and quiet continuous AF while capturing video with the Canon EOS Rebel T4i DSLR, a circular aperture (7 blades) for beautiful soft-focus backgrounds, and a short minimum focusing distance of only 0.98 feet/0.30 meters. 1 Year WarrantyFrom the manufacturer Canon EF 40mm f/2.8 STM Lens - Fixed A unique and indispensable addition to Canon's series of EF lenses, the EF 40mm f/2.8 STM offers an ultra-slim and lightweight design. Incredibly compact in size, the EF 40mm f/2.8 STM delivers high image quality from the center to the periphery thanks to its advanced lens configuration including an aspherical element, a bright 2.8 aperture, and optimized coatings that minimize ghosting and flare while providing exceptional color balance. The EF 40mm f/2.8 STM's unobtrusive design helps the photographer avoid overwhelming their subjects with a large lens and to remain discreet in sensitive shooting situations with no compromise in performance. Its diminutive design is complemented by features such as a developed stepping motor for smooth and quiet continuous AF while capturing video with the Canon EOS Rebel T4i DSLR, a circular aperture (7 blades) for beautiful soft-focus backgrounds, and a short minimum focusing distance of only 0.98 ft./0.30 m. Read more 

title: Canon TS-E 17mm f/4L UD Aspherical Ultra Wide Tilt-Shift Lens for Canon Digital SLR Cameras
text: Product Description Product Description Product description The widest tilt-shift lens in Canon's lineup, the new TS-E 17mm f/4L lens expands shooting possibilities exponentially on EOS Digital cameras. Designed with UD glass to minimize and compensate for chromatic aberrations, with specially coated aspherical elements for the highest possible glare-free image quality, this tilt-shift lens offers an angle of view of 93 degrees. Closest Focusing Distance: 0.82 feet. From the Manufacturer The widest tilt-shift lens in Canon's lineup, the new TS-E 17mm f/4L lens expands shooting possibilities exponentially on EOS Digital cameras. Designed with UD glass to minimize and compensate for chromatic aberrations, with specially coated aspherical elements for the highest possible glare-free image quality, this tilt-shift lens offers an angle of view of 93 degrees. New TS revolving lets users freely combine tilting and shifting within the range of +/- 90 degrees in the direction of movement. The lens also has an improved tilt & shift knob with an enhanced range of movement of up to +/- 6.5 degrees and revolving lenses for better operability, it uses a circular aperture for beautiful out-of-focus areas and has an SWC lens coating to control ghosting and flare to a far greater degree than with earlier coating technologies. Tilt and shift lens compatible with all Canon EOS cameras Ultra Wide 17mm focal length, ideal for architecture and landscapes High precision lens elements for low distortion and high resolution to the edge of the image +/- 6.5 degrees Tilt and +/-12mm Shift Tilt and shift mechanism rotates +/-90 degrees allowing shift in any direction Tilt mechanism rotates +/-90 degrees allowing tilt in any direction relative to the shift Aspherical and UD lens elements minimise chromatic aberration Sub-wavelength structure and super-spectra coatings minimise ghosting and flare Circular aperture for creative, blurred highlights Floating internal focus mechanism delivers high-image quality throughout focus range. MTF Chart Product Description Product Description Product description The widest tilt-shift lens in Canon's lineup, the new TS-E 17mm f/4L lens expands shooting possibilities exponentially on EOS Digital cameras. Designed with UD glass to minimize and compensate for chromatic aberrations, with specially coated aspherical elements for the highest possible glare-free image quality, this tilt-shift lens offers an angle of view of 93 degrees. Closest Focusing Distance: 0.82 feet. From the Manufacturer The widest tilt-shift lens in Canon's lineup, the new TS-E 17mm f/4L lens expands shooting possibilities exponentially on EOS Digital cameras. Designed with UD glass to minimize and compensate for chromatic aberrations, with specially coated aspherical elements for the highest possible glare-free image quality, this tilt-shift lens offers an angle of view of 93 degrees. New TS revolving lets users freely combine tilting and shifting within the range of +/- 90 degrees in the direction of movement. The lens also has an improved tilt & shift knob with an enhanced range of movement of up to +/- 6.5 degrees and revolving lenses for better operability, it uses a circular aperture for beautiful out-of-focus areas and has an SWC lens coating to control ghosting and flare to a far greater degree than with earlier coating technologies. Tilt and shift lens compatible with all Canon EOS cameras Ultra Wide 17mm focal length, ideal for architecture and landscapes High precision lens elements for low distortion and high resolution to the edge of the image +/- 6.5 degrees Tilt and +/-12mm Shift Tilt and shift mechanism rotates +/-90 degrees allowing shift in any direction Tilt mechanism rotates +/-90 degrees allowing tilt in any direction relative to the shift Aspherical and UD lens elements minimise chromatic aberration Sub-wavelength structure and super-spectra coatings minimise ghosting and flare Circular aperture for creative, blurred highlights Floating internal focus mechanism delivers high-image quality throughout focus range. MTF Chart

title: Canon EF-S 17-55mm f/2.8 IS USM Lens for Canon DSLR Cameras, Lens Only
text: Product Description From the Manufacturer Designed to meet consumer demands for a fast EF-S zoom lens, the EF-S 17-55mm offers image quality on par with Canon's highly regarded L-series lenses. The lens features a large circular aperture that produces a shallow depth of field, creating background blur that draws special attention to the photographic subject. The lens construction, meanwhile, includes UD and aspherical elements that deliver impressive image quality throughout the entire zoom range. And thanks to the Image Stabilizer lens groups--which shift to compensate for camera shake--the image appears crisp and clear on the image plane, eve in dim light. Finally, the lens offers a ring-type ultra-sonic monitor (USM), inner focusing, and new AF algorithms to help achieve autofocus quickly and quietly, along with full-time mechanical manual focusing that makes it possible to manually adjust the focus even in AF mode. As with all Canon lenses, this lens carries a one-year warranty. Focal length: 17-55mm Maximum aperture: f/2.8 Lens construction: 19 elements in 12 groups Diagonal angle of view: 78 degrees (at 30 feet) to 27 degrees (at 50 feet) Focus adjustment: AF with full-time manual Closest focusing distance: 1.15 feet Zoom system: 5-group helical zoom (front group moves 27mm) Filter size: 77mm Dimensions: 3.3 inches in diameter, 4.4 inches long Weight: 22.8 ounces The EF-S 17-55mm f2.8 IS USM offers image quality on a par with Canon's highly regarded L-series lenses. It has a large maximum aperture which, combined with higher shutter speeds, can minimize subject motion blur. Shallow depth-of-field separation of a subject from its background is much easier to achieve and the f2.8 maximum aperture allows a bright finder and extremely precise focusing with f2.8 compatible AF sensors. The internal stabilization has a sharpness benefit equivalent to a three-stop faster shutter speed, making this lens outstanding in low-light situations. Smaller and lighter than lenses of similar specifications, the EF-S 17-55 mm f2.8 IS USM lens has a 35mm equivalent focal length of 27-88mm and is compatible only with the EOS 30D, EOS 20D, EOS Digital Rebel XT, and EOS Digital Rebel SLRs. To meet user demands for a fast EF-S zoom lens, Canon has specially designed a new lens with a large aperture of f/2.8 for select Canon Digital SLR cameras. The large circular aperture produces a shallow depth-of-field, creating background blur that draws attention to the photographic subject. The lens construction includes UD and aspherical elements, which deliver impressive image quality throughout the entire zoom range. Image Stabilizer lens groups shift to compensate for camera movement so that the image appears steady on the image plane, ensuring clear, crisp images, even in dim light. With a Ring-type USM, inner focusing and new AF algorithms, this lens achieves autofocus quickly and quietly, and with full-time mechanical manual focusing, manually adjusting the focus is possible even in AF mode. Product Description From the Manufacturer Designed to meet consumer demands for a fast EF-S zoom lens, the EF-S 17-55mm offers image quality on par with Canon's highly regarded L-series lenses. The lens features a large circular aperture that produces a shallow depth of field, creating background blur that draws special attention to the photographic subject. The lens construction, meanwhile, includes UD and aspherical elements that deliver impressive image quality throughout the entire zoom range. And thanks to the Image Stabilizer lens groups--which shift to compensate for camera shake--the image appears crisp and clear on the image plane, eve in dim light. Finally, the lens offers a ring-type ultra-sonic monitor (USM), inner focusing, and new AF algorithms to help achieve autofocus quickly and quietly, along with full-time mechanical manual focusing that makes it possible to manually adjust the focus even in AF mode. As with all Canon lenses, this lens carries a one-year warranty. Focal length: 17-55mm Maximum aperture: f/2.8 Lens construction: 19 elements in 12 groups Diagonal angle of view: 78 degrees (at 30 feet) to 27 degrees (at 50 feet) Focus adjustment: AF with full-time manual Closest focusing distance: 1.15 feet Zoom system: 5-group helical zoom (front group moves 27mm) Filter size: 77mm Dimensions: 3.3 inches in diameter, 4.4 inches long Weight: 22.8 ounces The EF-S 17-55mm f2.8 IS USM offers image quality on a par with Canon's highly regarded L-series lenses. It has a large maximum aperture which, combined with higher shutter speeds, can minimize subject motion blur. Shallow depth-of-field separation of a subject from its background is much easier to achieve and the f2.8 maximum aperture allows a bright finder and extremely precise focusing with f2.8 compatible AF sensors. The internal stabilization has a sharpness benefit equivalent to a three-stop faster shutter speed, making this lens outstanding in low-light situations. Smaller and lighter than lenses of similar specifications, the EF-S 17-55 mm f2.8 IS USM lens has a 35mm equivalent focal length of 27-88mm and is compatible only with the EOS 30D, EOS 20D, EOS Digital Rebel XT, and EOS Digital Rebel SLRs. To meet user demands for a fast EF-S zoom lens, Canon has specially designed a new lens with a large aperture of f/2.8 for select Canon Digital SLR cameras. The large circular aperture produces a shallow depth-of-field, creating background blur that draws attention to the photographic subject. The lens construction includes UD and aspherical elements, which deliver impressive image quality throughout the entire zoom range. Image Stabilizer lens groups shift to compensate for camera movement so that the image appears steady on the image plane, ensuring clear, crisp images, even in dim light. With a Ring-type USM, inner focusing and new AF algorithms, this lens achieves autofocus quickly and quietly, and with full-time mechanical manual focusing, manually adjusting the focus is possible even in AF mode.From the manufacturer Canon EF-S 17-55mm f/2.8 IS USM Lens for Canon DSLR Cameras To meet user demands for a fast EF-S zoom lens, Canon has specially designed a lens with a large aperture of f/2.8 for select Canon Digital SLR cameras. The large circular aperture produces a shallow depth-of-field, creating background blur that draws attention to the photographic subject. The lens construction includes UD and aspherical elements, which deliver impressive image quality throughout the entire zoom range. Image Stabilizer lens groups shift to compensate for camera movement so that the image appears steady on the image plane, ensuring clear, crisp images, even in dim light. With a Ring-type USM, inner focusing and AF algorithms, this lens achieves autofocus quickly and quietly, and with full-time mechanical manual focusing, manually adjusting the focus is possible even in AF mode. Read more 

title: Canon EF 50mm f/1.4 USM Standard and Medium Telephoto Lens for Canon SLR Cameras, Fixed
text: Product Description Product Description Standard lens Featuring superb quality and portability. 2 high-refraction lens elements and new Gaussian optics eliminate astigmatism and suppress astigmatic difference. Crisp images with little flare are obtained even at the maximum aperture. Filter size: 58 mm, Closest Focusing Distance: 1.5 feet. The 50mm f/1.4 standard lens is a terrific choice for both casual and professional photographers. The lens is outfitted with 2 high-refraction lens elements and new Gaussian optics, which combine to eliminate astigmatism and suppress astigmatic difference. As a result, the lens obtains crisp images with little flare even at the maximum aperture. The lens's f/1.4 speed, meanwhile, is perfect for available-light shooting. And as a bonus, this lens is the only lens in the EF system to offer an extra-small Micro Ultra Sonic Motor (USM) while still providing a full-time manual focusing option. Other features include a close focusing distance of 1.5 feet, a 58mm filter size, and a one-year warranty.what's in the boxCanon Normal EF 50mm f/1.4 USM Autofocus Lens, E-58U 58mm Snap-On Lens Cap, Lens Dust Cap E (Rear) and 1-Year Warranty. Specifications. Amazon.com The 50mm f/1.4 standard lens is a terrific choice for both casual and professional photographers. The lens is outfitted with two high-refraction lens elements and new Gaussian optics, which combine to eliminate astigmatism and suppress astigmatic difference. As a result, the lens obtains crisp images with little flare even at the maximum aperture. The lens's f/1.4 speed, meanwhile, is perfect for available-light shooting. And as a bonus, this lens is the only lens in the EF system to offer an extra-small Micro Ultra Sonic Motor (USM) while still providing a full-time manual focusing option. Other features include a close focusing distance of 1.5 feet, a 58mm filter size, and a one-year warranty. what's in the box Canon Normal EF 50mm f/1.4 USM Autofocus Lens, E-58U 58mm Snap-On Lens Cap, Lens Dust Cap E (Rear) and 1-Year Warranty. Specifications Focal length: 50mm Maximum aperture: f/1.4L Lens construction: 7 elements in 6 groups Angle of view: 46 degrees Focus adjustment: Overall linear extension system with USM Closest focusing distance: 1.5 feet Filter size: 58mm Dimensions: 2.9 inches in diameter and 2 inches long Weight: 10.2 ounces Warranty: 1 year Product Description Product Description Standard lens Featuring superb quality and portability. 2 high-refraction lens elements and new Gaussian optics eliminate astigmatism and suppress astigmatic difference. Crisp images with little flare are obtained even at the maximum aperture. Filter size: 58 mm, Closest Focusing Distance: 1.5 feet. The 50mm f/1.4 standard lens is a terrific choice for both casual and professional photographers. The lens is outfitted with 2 high-refraction lens elements and new Gaussian optics, which combine to eliminate astigmatism and suppress astigmatic difference. As a result, the lens obtains crisp images with little flare even at the maximum aperture. The lens's f/1.4 speed, meanwhile, is perfect for available-light shooting. And as a bonus, this lens is the only lens in the EF system to offer an extra-small Micro Ultra Sonic Motor (USM) while still providing a full-time manual focusing option. Other features include a close focusing distance of 1.5 feet, a 58mm filter size, and a one-year warranty.what's in the boxCanon Normal EF 50mm f/1.4 USM Autofocus Lens, E-58U 58mm Snap-On Lens Cap, Lens Dust Cap E (Rear) and 1-Year Warranty. Specifications. Amazon.com The 50mm f/1.4 standard lens is a terrific choice for both casual and professional photographers. The lens is outfitted with two high-refraction lens elements and new Gaussian optics, which combine to eliminate astigmatism and suppress astigmatic difference. As a result, the lens obtains crisp images with little flare even at the maximum aperture. The lens's f/1.4 speed, meanwhile, is perfect for available-light shooting. And as a bonus, this lens is the only lens in the EF system to offer an extra-small Micro Ultra Sonic Motor (USM) while still providing a full-time manual focusing option. Other features include a close focusing distance of 1.5 feet, a 58mm filter size, and a one-year warranty. what's in the box Canon Normal EF 50mm f/1.4 USM Autofocus Lens, E-58U 58mm Snap-On Lens Cap, Lens Dust Cap E (Rear) and 1-Year Warranty. Specifications Focal length: 50mm Maximum aperture: f/1.4L Lens construction: 7 elements in 6 groups Angle of view: 46 degrees Focus adjustment: Overall linear extension system with USM Closest focusing distance: 1.5 feet Filter size: 58mm Dimensions: 2.9 inches in diameter and 2 inches long Weight: 10.2 ounces Warranty: 1 yearFrom the manufacturer Standard Lens EF 50mm f/1.4 USM The EF 50mm f/1.4 USM delivers superb quality and portability. Equipped with a maximum aperture of f/1.4 and made with lens elements to help suppress distortion, it provides crisp images with minimal flare. With a fast and accurate focusing system, the lens brings high performance in a compact size. Previous page Maximum Aperture of f/1.4 Fast Maximum Aperture The EF 50mm f/1.4 USM provides easy use in low-light venues and produces a shallow depth of field. Great in Low Light The EF 50mm f/1.4 USM’s wide aperture means it can capture more light during low-light situations. Beautiful Background Blur The EF 50mm f/1.4 USM is fast, making it easy to create beautiful bokeh and bring portraits to life. Next page 1 Fast Maximum Aperture 2 Great in Low Light 3 Beautiful Background Blur Fast, Precise Focus To help capture every movement, the EF 50mm f/1.4 USM uses an inner focusing ring USM (ultrasonic motor) system to help deliver fast, precise and near-silent performance. For even more refinement, the EF 50mm f/1.4 USM offers full-time manual focus as well. EF 50mm f/1.4 USM Compare Lenses 1:1.4 Maximum Aperture 1:1.8 7 elements/6 groups Lens Construction 6 elements/5 groups USM Focus Drive STM 1.5 ft. Min. Focus Distance 1.2 ft. 58mm Filter Size 49mm 2.9 x 2.0 in. Diameter x Length 2.7 x 1.6 in. 10.2 oz. Weight 5.7 oz. 1:1.4 Maximum Aperture 1:1.2 7 elements/6 groups Lens Construction 8 elements/6 groups USM Focus Drive USM 1.5 ft. Min. Focus Distance 1.5 ft. 58mm Filter Size 72mm 2.9 x 2.0 in. Diameter x Length 3.4 x 2.6 in. 10.2 oz. Weight 19.2 oz. Previous page EF 50mm f/1.8 STM EF 50mm f/1.2L USM Next page Learn More Learn More 

title: Canon EF 17-40mm f/4L USM Ultra Wide Angle Zoom Lens for SLR Cameras
text: Product Description Product Description Broaden your perspective with the Canon EF 17-40mm ultra-wide-angle zoom lens. Ideal for both film and digital SLR Cameras, the lens offers three aspherical lens elements in addition to a Super UD (ultra-low dispersion) glass element, creating superior optics in all conditions. Broaden your perspective with the Canon EF 17-40mm ultra-wide-angle zoom lens. Ideal for both film and digital SLR Cameras, the lens offers three aspherical lens elements in addition to a Super UD (ultra-low dispersion) glass element, creating superior optics in all conditions. In addition, the lens focuses as close as 11 inches (0.28mm), and offers both Canon's full-time manual focus and a powerful ring-type ultra-sonic monitor (USM) that produces fast and silent autofocus. Other features include a constant f/4 maximum aperture, the choice of screw-in 77mm filters or a holder in the rear of the lens for up to three gel filters, and optical coatings optimized for use with digital Cameras. Boasting weather-resistant construction similar to other high-end L-series Cameras, the lens carries a one-year warranty. About half the price of the 16-35 f/2.8 lens, this L-series lens has an entirely new optical design with three Aspherical elements and a Super UD-glass element. The combination provides superb contrast and sharpness, even at the widest settings. It's ideal for both film and digital SLRs, and features the same weather-resistant design, rear gel filter holder, and high-speed Ultrasonic Motor as the EF 16-35mm lens. What's in the box: Canon EF 17-40mm f/4L USM Lens,E-77U 77mm Snap-On Lens Cap,Lens Dust Cap E (Rear),EW-83E Lens Hood,Lens Case LP1319 and 1-Year Warranty. Broaden your perspective with the Canon EF 17-40mm ultra-wide-angle zoom lens. Ideal for both film and digital SLR cameras, the lens offers three aspherical lens elements in addition to a Super UD (ultra-low dispersion) glass element, creating superior optics in all conditions. In addition, the lens focuses as close as 11 inches (0.28mm), and offers both Canon's full-time manual focus and a powerful ring-type ultra-sonic monitor (USM) that produces fast and silent autofocus. Other features include a constant f/4 maximum aperture, the choice of screw-in 77mm filters or a holder in the rear of the lens for up to three gel filters, and optical coatings optimized for use with digital cameras. Boasting weather-resistant construction similar to other high-end L-series cameras, the lens carries a one-year warranty. About half the price of the 16-35 f/2.8 lens, this L-series lens has an entirely new optical design with three Aspherical elements and a Super UD-glass element. The combination provides superb contrast and sharpness, even at the widest settings. It's ideal for both film and digital SLRs, and features the same weather-resistant design, rear gel filter holder, and high-speed Ultrasonic Motor as the EF 16-35mm lens. What's in the box: Canon EF 17-40mm f/4L USM Lens,E-77U 77mm Snap-On Lens Cap,Lens Dust Cap E (Rear),EW-83E Lens Hood,Lens Case LP1319 and 1-Year Warranty. From the Manufacturer Broaden your perspective with the Canon EF 17-40mm ultra-wide-angle zoom lens. Ideal for both film and digital SLR cameras, the lens offers three aspherical lens elements in addition to a Super UD (ultra-low dispersion) glass element, creating superior optics in all conditions. In addition, the lens focuses as close as 11 inches (0.28mm), and offers both Canon's full-time manual focus and a powerful ring-type ultra-sonic monitor (USM) that produces fast and silent autofocus. Other features include a constant f/4 maximum aperture, the choice of screw-in 77mm filters or a holder in the rear of the lens for up to three gel filters, and optical coatings optimized for use with digital cameras. Boasting weather-resistant construction similar to other high-end L-series cameras, the lens carries a one-year warranty. Focal length: 17-40mm Maximum aperture: 1:4 Lens construction: 12 elements in 9 groups Diagonal angle of view: 104 to 57 degrees (at 30 feet) Focus adjustment: Inner focusing system with USM Closest focusing distance: 0.9 feet Zoom system: Rotating type Filter size: 77mm Dimensions: 3.3 inches in diameter, 3.8 inches long Weight: 1.1 pounds A new and affordable L-series ultra-wide-angle zoom lens that's ideal for both film and digital SLRs. Superior optics are assured by the use of three Aspherical lens elements, in addition to a Super UD (Ultra-low Dispersion) glass element. Optical coatings are optimized for use with digital cameras. This lens focuses as close as 11 inches (0.28m), and offers both Canon's full-time manual focus and a powerful ring-type USM for fast and silent AF. It has a constant f/4 maximum aperture, and offers the choice of screw-in 77mm filters or a holder in the rear of the lens for up to three gel filters. Finally, it offers weather-resistant construction similar to other high-end L-series lenses. About half the price of the 16-35 f/2.8 lens, this L-series lens has an entirely new optical design with three Aspherical elements and a Super UD-glass element. The combination provides superb contrast and sharpness, even at the widest settings. It's ideal for both film and digital SLRs, and features the same weather-resistant design, rear gel filter holder, and high-speed Ultrasonic Motor as the EF 16-35mm lens. What's in the box: Canon EF 17-40mm f/4L USM Lens,E-77U 77mm Snap-On Lens Cap,Lens Dust Cap E (Rear),EW-83E Lens Hood,Lens Case LP1319 and 1-Year Warranty. Product Description Product Description Broaden your perspective with the Canon EF 17-40mm ultra-wide-angle zoom lens. Ideal for both film and digital SLR Cameras, the lens offers three aspherical lens elements in addition to a Super UD (ultra-low dispersion) glass element, creating superior optics in all conditions. Broaden your perspective with the Canon EF 17-40mm ultra-wide-angle zoom lens. Ideal for both film and digital SLR Cameras, the lens offers three aspherical lens elements in addition to a Super UD (ultra-low dispersion) glass element, creating superior optics in all conditions. In addition, the lens focuses as close as 11 inches (0.28mm), and offers both Canon's full-time manual focus and a powerful ring-type ultra-sonic monitor (USM) that produces fast and silent autofocus. Other features include a constant f/4 maximum aperture, the choice of screw-in 77mm filters or a holder in the rear of the lens for up to three gel filters, and optical coatings optimized for use with digital Cameras. Boasting weather-resistant construction similar to other high-end L-series Cameras, the lens carries a one-year warranty. About half the price of the 16-35 f/2.8 lens, this L-series lens has an entirely new optical design with three Aspherical elements and a Super UD-glass element. The combination provides superb contrast and sharpness, even at the widest settings. It's ideal for both film and digital SLRs, and features the same weather-resistant design, rear gel filter holder, and high-speed Ultrasonic Motor as the EF 16-35mm lens. What's in the box: Canon EF 17-40mm f/4L USM Lens,E-77U 77mm Snap-On Lens Cap,Lens Dust Cap E (Rear),EW-83E Lens Hood,Lens Case LP1319 and 1-Year Warranty. Broaden your perspective with the Canon EF 17-40mm ultra-wide-angle zoom lens. Ideal for both film and digital SLR cameras, the lens offers three aspherical lens elements in addition to a Super UD (ultra-low dispersion) glass element, creating superior optics in all conditions. In addition, the lens focuses as close as 11 inches (0.28mm), and offers both Canon's full-time manual focus and a powerful ring-type ultra-sonic monitor (USM) that produces fast and silent autofocus. Other features include a constant f/4 maximum aperture, the choice of screw-in 77mm filters or a holder in the rear of the lens for up to three gel filters, and optical coatings optimized for use with digital cameras. Boasting weather-resistant construction similar to other high-end L-series cameras, the lens carries a one-year warranty. About half the price of the 16-35 f/2.8 lens, this L-series lens has an entirely new optical design with three Aspherical elements and a Super UD-glass element. The combination provides superb contrast and sharpness, even at the widest settings. It's ideal for both film and digital SLRs, and features the same weather-resistant design, rear gel filter holder, and high-speed Ultrasonic Motor as the EF 16-35mm lens. What's in the box: Canon EF 17-40mm f/4L USM Lens,E-77U 77mm Snap-On Lens Cap,Lens Dust Cap E (Rear),EW-83E Lens Hood,Lens Case LP1319 and 1-Year Warranty. From the Manufacturer Broaden your perspective with the Canon EF 17-40mm ultra-wide-angle zoom lens. Ideal for both film and digital SLR cameras, the lens offers three aspherical lens elements in addition to a Super UD (ultra-low dispersion) glass element, creating superior optics in all conditions. In addition, the lens focuses as close as 11 inches (0.28mm), and offers both Canon's full-time manual focus and a powerful ring-type ultra-sonic monitor (USM) that produces fast and silent autofocus. Other features include a constant f/4 maximum aperture, the choice of screw-in 77mm filters or a holder in the rear of the lens for up to three gel filters, and optical coatings optimized for use with digital cameras. Boasting weather-resistant construction similar to other high-end L-series cameras, the lens carries a one-year warranty. Focal length: 17-40mm Maximum aperture: 1:4 Lens construction: 12 elements in 9 groups Diagonal angle of view: 104 to 57 degrees (at 30 feet) Focus adjustment: Inner focusing system with USM Closest focusing distance: 0.9 feet Zoom system: Rotating type Filter size: 77mm Dimensions: 3.3 inches in diameter, 3.8 inches long Weight: 1.1 pounds A new and affordable L-series ultra-wide-angle zoom lens that's ideal for both film and digital SLRs. Superior optics are assured by the use of three Aspherical lens elements, in addition to a Super UD (Ultra-low Dispersion) glass element. Optical coatings are optimized for use with digital cameras. This lens focuses as close as 11 inches (0.28m), and offers both Canon's full-time manual focus and a powerful ring-type USM for fast and silent AF. It has a constant f/4 maximum aperture, and offers the choice of screw-in 77mm filters or a holder in the rear of the lens for up to three gel filters. Finally, it offers weather-resistant construction similar to other high-end L-series lenses. About half the price of the 16-35 f/2.8 lens, this L-series lens has an entirely new optical design with three Aspherical elements and a Super UD-glass element. The combination provides superb contrast and sharpness, even at the widest settings. It's ideal for both film and digital SLRs, and features the same weather-resistant design, rear gel filter holder, and high-speed Ultrasonic Motor as the EF 16-35mm lens. What's in the box: Canon EF 17-40mm f/4L USM Lens,E-77U 77mm Snap-On Lens Cap,Lens Dust Cap E (Rear),EW-83E Lens Hood,Lens Case LP1319 and 1-Year Warranty.From the manufacturer Canon EF 17-40mm f/4L USM Ultra Wide Angle Zoom Lens for Canon SLR Cameras L-series ultra-wide-angle zoom lens that's ideal for both film and digital SLRs. Superior optics by the use of three Aspherical lens elements, in addition to a Super UD (Ultra-low Dispersion) glass element. Optical coatings are optimized for use with digital cameras. This lens focuses as close as 11 inches (0.28m), and offers both Canon's full-time manual focus and a powerful ring-type USM for fast and silent AF. It has a constant f/4 maximum aperture, and offers the choice of screw-in 77mm filters or a holder in the rear of the lens for up to three gel filters. Finally, it offers weather-resistant construction. Read more 

title: Canon EF 20mm f/2.8 USM Wide-Angle Fixed Lens
text: Product Description Product Description The Canon EF 20mm f/2.8 USM is an ultra wide-angle lens for serious applications. Plus it’s easy to hold and carry at 14.3 oz. (405g). A floating rear focusing system gives sharp images at all subject distances and an ultrasonic motor (USM) enables fast, smooth and quiet autofocus. Full-time manual focus override allows for precise manual focus even when in AF mode. The minimum focus distance is 9.8 inches. Filter size: 72 mm, Closest Focusing Distance: 0.8 feet. From the Manufacturer Wide-angle lenses let you capture more of the image by broadening the angle of view and increasing the depth of field, thereby bringing more of the area into focus. The lenses also provide a unique perspective by expanding the apparent distance between the foreground and the background. This Canon 20mm f/2.8 is no exception, with such additional features as a floating rear focusing system with an Ultra Sonic Motor (USM), a 0.8-foot close focusing distance, and a 94-degree diagonal angle of view. As with all Canon lenses, the 20mm lens carries a one-year warranty. Specifications Focal length: 20mm Maximum aperture: f/2.8 Lens construction: 11 elements in 9 groups Angle of view: 94 degrees Focus adjustment: Rear focusing system with USM Close focusing distance: 0.8 feet Filter size: 72mm Corresponding mounts: Canon Dimensions: 3.1 inches in diameter and 2.8 inches long Weight: 14.3 ounces Warranty: 1 year Ultra-wide-angle lens for serious applications. Easy to hold and carry at 14.3 oz. (405g). Floating rear focusing system. Sharp images are obtained at all subject distances. The optical performance, fast f/2.8 speed and ultra-wide-angle coverage make this a great choice for many applications, like interiors, scenics, travel and photojournalism. It uses a "floating" optical system for excellent sharpness even at its minimum focusing distance of under 10 inches (0.25m), and with a ring-type USM and full-time manual focusing capability, offers the speed and handling pros expect. Wide and Fast If you need an ultra-wide angle and a large aperture, one of the following lenses will fit the bill. Ultra-wide-angle lenses can capture scenes beyond your natural field of vision. The EF 15mm f/2.8 Fisheye, the widest of them all, has a 180∞ angle of view. For more normal-looking wide-angle shots, there are longer wide-angle lenses up to 35mm with the maximum aperture you need. Product Description Product Description The Canon EF 20mm f/2.8 USM is an ultra wide-angle lens for serious applications. Plus it’s easy to hold and carry at 14.3 oz. (405g). A floating rear focusing system gives sharp images at all subject distances and an ultrasonic motor (USM) enables fast, smooth and quiet autofocus. Full-time manual focus override allows for precise manual focus even when in AF mode. The minimum focus distance is 9.8 inches. Filter size: 72 mm, Closest Focusing Distance: 0.8 feet. From the Manufacturer Wide-angle lenses let you capture more of the image by broadening the angle of view and increasing the depth of field, thereby bringing more of the area into focus. The lenses also provide a unique perspective by expanding the apparent distance between the foreground and the background. This Canon 20mm f/2.8 is no exception, with such additional features as a floating rear focusing system with an Ultra Sonic Motor (USM), a 0.8-foot close focusing distance, and a 94-degree diagonal angle of view. As with all Canon lenses, the 20mm lens carries a one-year warranty. Specifications Focal length: 20mm Maximum aperture: f/2.8 Lens construction: 11 elements in 9 groups Angle of view: 94 degrees Focus adjustment: Rear focusing system with USM Close focusing distance: 0.8 feet Filter size: 72mm Corresponding mounts: Canon Dimensions: 3.1 inches in diameter and 2.8 inches long Weight: 14.3 ounces Warranty: 1 year Ultra-wide-angle lens for serious applications. Easy to hold and carry at 14.3 oz. (405g). Floating rear focusing system. Sharp images are obtained at all subject distances. The optical performance, fast f/2.8 speed and ultra-wide-angle coverage make this a great choice for many applications, like interiors, scenics, travel and photojournalism. It uses a "floating" optical system for excellent sharpness even at its minimum focusing distance of under 10 inches (0.25m), and with a ring-type USM and full-time manual focusing capability, offers the speed and handling pros expect. Wide and Fast If you need an ultra-wide angle and a large aperture, one of the following lenses will fit the bill. Ultra-wide-angle lenses can capture scenes beyond your natural field of vision. The EF 15mm f/2.8 Fisheye, the widest of them all, has a 180∞ angle of view. For more normal-looking wide-angle shots, there are longer wide-angle lenses up to 35mm with the maximum aperture you need.