Welcome to the Canon 17-40 f/4 L Group. This is a public group with all users of this lens invited to join. Please limit the number of daily uploads to no more than 5. Thanks for joining and do invite others.
Please tag your photos with "Canon 17-40 f/4 L USM Group"
*** NO PHOTOS SHOWING: NUDITY, PORN, DEAD ANIMALS or RELIGIOUS SLANDER ... THIS INCLUDES IMAGES OF ART DEPICTING
THE SUCH _ any will be removed and the group member will be Banned without Warning. ***
Canon 17-40 f/4 L USM quick facts:
Standard zoom lens for digital EOS SLR cameras:
While it is an excellent lens when used with an analogue SLR camera, the EF17-40mm f/4L USM is especially well suited for digital SLR cameras with an imaging sensor size smaller than the 35mm format. Indeed on such digital SLR cameras these focal lengths can give an angle of view approximately equivalent to that of a 28-70mm lens used on a 35mm camera, which makes it the ideal standard zoom lens.
Superior optical performance:
The EF17-40mm f/4L USM has 12 lens elements arranged in 9 groups. Super Spectra Coating on the elements ensures excellent colour balance and minimises ghosting and flare. To provide superb image quality over a 17-40mm zoom range the lens uses three aspheric elements of two different types, while Super UD (Ultra-low Dispersion) glass is used to prevent the chromatic aberrations that often can degrade the subject edge clarity.
