Product: Opteka 500mm f/6.3 (with 2X- 1000mm) Telephoto Mirror Lens for Nikon F-Mount D6, D5, D4, D850, D810, D800, D780, D750, D610, D600, D7500, D7200, D5600, D5500, D5300, D3500 and D3400 DSLR Cameras
Brand: Opteka
Color: Black
The Opteka mirror lens is incredibly compact and lightweight. The image coming through the lens is bounced off of mirrors before going to the image sensor. This allows the lens to be much shorter than it would need to be without the mirrors. This lens has no diaphragm and is normally used with adjusting the shutter speed to reduce light. Using an advanced reflex design, this lens is perfect for the professional and amateur photographer alike. Using a 2x tele-converter with a 500mm will effectively increase the focal length to 1000mm. A lens set to f/6.3 will now be f/12.6. It's an extremely powerful telephoto zoom lens with the versatility that you need. This lens is great for the wildlife or nature photographer who wants to be hidden while taking photos of the subject. When combined with the included T-mount to fit your camera system, this telephoto works on both "full frame" cameras as well as the "APS-C" style digital SLR cameras. You can use the lens in "M" manual exposure mode or "A" aperture-priority mode only. This lens has a broad diameter and stocky build, making it a bit easier to handle than a normal refractor lens. It also has a much different rendering of out of focus areas than a normal lens; highlights will be doughnut-shaped rings with more saturation and contrast on the edge of the ring than on the center.

 Bright sunlight and a sturdy monopod or tripod is recommend when using this lens.

 Specifications
 Elements/Groups: 7/6
 Focus Modes: Manual Focus
 Minimum Focus: 6.6' (2.0 m)
 Angle of View: 4.1 to 2.7 Degrees
 Aperture: f/6.3
 Filter Size: 95mm Front, 34mm Rear
 Max Diameter: 3.9" (98mm)
 Length: 4.7"
 Weight: 1.55 lb (705g)

 Included Items
 Opteka 500mm f/6.3 Telephoto Lens
 Opteka 2x Tele-Converter
 Opteka T-Mount Lens Adapter
 Opteka Padded Pouch
 Opteka Lens Caps
 Opktea 10 Year Warranty

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ADVANCED OPTICS - Featuring an optimized design, this lens uses mirrors and a series of 7 optical glass elements in 6 groups to reduce chromatic and spherical aberrations. A anti-reflective coating suppresses lens flare and ghosting for increased contrast and color fidelity.
SUPER RANGE - Manual focus 500mm or 1000mm with the 2x converter, this lens is not only a superb long range choice, but also performs well in a variety of scenes from sports and surveillance to everyday shooting.
SOLID CONSTRUCTION - Full metal body and rear mount allow this lens to withstand wear and tear much better than plastic lenses while commanding a rugged, solid feel when using.
COMPACT AND LIGHTWEIGHT - Mirrors allows this lens to be much shorter than it would need to be without the mirrors. At 4.7-inches long, this 500mm f/6.3 is one of the shortest telephoto lenses currently available.
COMPATIBILITY - Can be used on all Nikon FX full frame and DX APS-C cameras including D6, D5, D4, D3, D2, D1, D7500, D7200, D7100, D7000, D5600, D5500, D5400, D5300, D5200, D5100, D5000, D3500, D3400, D3300, D3200, D3100, D3000, D810, D800, D780, D750, D700, D610, D600, D500, D90, D80, D70, D60, D50, D40.

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