CANON EF 17-40MM F4.0L USM

Web Code: 010CAN070

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Overview

Ultra-wide-angle Zoom Lens
Ideal for film & digital SLRs
Super Ultra-low Dispersion Glass
Filter Diameter: 77mm
Three aspherical lens elements
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
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
Offers weather-resistant construction similar to other high-end L-series lenses

Specs

Lens Performance

Lens Type:	Digital SLR Lenses
Focal Length:	17-40mm
Maximum Aperture:	f/4.0
Aperture (Max. & Min.):	Max: f/4.0, Min: f/22
Camera Mount Type:	Canon EF
Camera Format:	Full-Frame
Angle of View:	104-57 degrees
Minimum Focus Distance:	0.28m
Maximum Close-Up Magnification:	0.24x
Groups/Elements:	9 Groups/12 Elements
Diaphragm Blades:	7