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.
SPECIFICATIONS
Focal
Length & Maximum Aperture:
17-40mm 1:4
Lens
Construction:
12 elements
in 9 groups
Diagonal
Angle of View:
74° - 29°
Focus
Adjustment:
Inner focusing
system with USM
Closest
Focusing Distance:
0.28m / 0.9
ft.
Zoom
System:
Rotating Type
Filter
Size:
77mm
Max.
Diameter x Length, Weight:
3.3" x 3.8",
1.1 lbs. / 83.5mm x 96.8mm, 500g
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