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.
Sample Image
MTF Charts
Focal Length & Maximum Aperture
17 - 40mm; 1:4 Lens Construction
12 elements in 9 groups Diagonal Angle of View
104° - 57° 30' Focus Adjustment
Inner focusing system with USM Closest Focusing Distance
0.28m / 0.9 ft. Zoom System
Rotating type Filter Size
77mmMax. Diameter x Length, Weight3.3" x 3.8", 1.1 lb. / 83.5 x 96.8mm, 500g
Focal Length & Maximum Aperture
17 - 40mm; 1:4 Lens Construction
12 elements in 9 groups Diagonal Angle of View
104° - 57° 30' Focus Adjustment
Inner focusing system with USM Closest Focusing Distance
0.28m / 0.9 ft. Zoom System
Rotating type Filter Size
77mmMax. Diameter x Length, Weight3.3" x 3.8", 1.1 lb. / 83.5 x 96.8mm, 500g
560 Trường Chinh, Hà Nội 84-4-35640558 - 0909860886