Canon EF 17-40mm f/4L USM Ultra Wide Angle Zoom Lens for Canon SLR Cameras
Canon EF 17-40mm f4L USM Ultra Wide Angle Zoom Lens for Canon SLR Cameras
A new and affordable L-series ultra-wide angle zoom lens that is ideal for both film and digital SLR cameras. Superior optics are assured by the use of three aspherical lenses, in addition to a Super UD (Ultra-low Dispersion) glass element. The 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-manual focus and a powerful ring-type USM for fast and silent AF. It is a constant f / 4 maximum aperture, and offers the choice of screw 77 millimeters 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. Focal Length 17 - 40mm Maximum aperture 1:4 Lens construction 12 elements in 9 groups Diagonal angle of 104 ° - 57 ° 30 'Focus of the inner focusing system with USM Closest Focusing Distance 0.28m / 0.9 ft. Zoom System Rotating type Filter size 77 millimeters Maximum diameter x length 3.3 "x 3.8", 1.1 pounds / 83.5 x 96.8 mm Weight 500g