17-40mm ultra-wide 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.
- Optical coatings optimized for digital cameras
- Close focus to 11 inches
- Super UD and three Aspherical lens elements ensure superior image quality
- Dust- and moisture-resistant, constructed for professional use
-
Filter Size :
77 mm
-
Focal Length (Maximum) :
40 mm
-
Focal Length (Minimum) :
17 mm
-
Focal Length (Minimum) :
0.67 in
-
Lens Type :
Aspherical
-
Maximum Aperture (Minimum f-number) :
4
-
Product Weight :
500 kg
-
Product Weight :
1102.31 lbs
-
Warranty :
1 Year
-
Lens Construction :
12 elements in 9 groups
-
Diagonal Angle of View :
104 - 57 Deg 30'
-
Focus Adjustment :
Inner focusing system with USM
-
Closest Focusing Distance :
0.28 m
-
Zoom System :
Rotating type
-
Max. Diameter x Length :
3.3 x 3.8 inch
-
Maximum Magnification :
0.24 at 40 mm
-
Field of View :
234 x 365 - 100 x 150 mm at 0.28 m