Canon EF 17-40mm f/4L USM Ultra Wide Angle Zoom Lens for Canon SLR Cameras (Certified Refurbished) This Certified Refurbished product is tested and certified to look and work like new. The refurbishing process includes functionality testing, basic cleaning, inspection, and repackaging. The product ships with all relevant accessories, a minimum 90-day warranty, and may arrive in a generic box. Only select sellers who maintain a high performance bar may offer Certified Refurbished products on Amazon.com 17-40mm ultra-wide-angle zoom lens with f/4 maximum aperture for Canon SLR cameras.Diagonal angle of view 104 - 57 30' 3 aspherical lens elements and super UD glass element create superior optics in all conditions, Closest focusing distance : 0.9 feet Powerful ring-type ultra-sonic monitor (USM) produces fast and silent autofocusing, Focuses as close as 11 inches; supports screw-in 77mm filters or up to 3 gel filters Suitable for Wedding/Nature Photography, Weather-resistant construction; measures 3.3 inches in diameter; 1-year warranty