CANON EF 17-40mm f/4L USM SPECIFICATION

CANON EF 17-40mm f/4L USM SPECIFICATION
CANON EF 17-40mm f/4L USM
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..
SPECIFICATION
Focal Length & Maximum Aperture
Lens Construction
Diagonal Angle of View
Focus Adjustment
Closest Focusing Distance
Zoom System
Filter Size
Max. Diameter x Length, Weight
17 - 40mm; 1:4
12 elements in 9 groups
104° - 57° 30'
Inner focusing system with USM
0.28m / 0.9 ft.
Rotating type
77mm
3.3" x 3.8", 1.1 lb. / 83.5 x 96.8mm, 500g
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