• 17 40 millimeter 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 ultrasonic monitor (USM) produces fast and silent autofocusing, Focuses as close as 11 inches, supports screw in 77 millimeter filters or up to 3 gel filters. Rounded seven-blade diaphragm contributes to a pleasing out of focus quality that benefits the use of shallow depth of field and selective focus techniques
• Suitable for Wedding/Nature Photography, Weather resistant construction, Water and Dust Resistant, measures 3.3 inches in diameter, 1 year warranty