Has full-time manual focus. Canon EF 17-40mm f/4L USM. Canon EF 24-105mm F/4L IS USM. With full-time manual focus, you can move the focus ring whilst it is in AF (autofocus) mode. This means that you can make manual adjustments once the AF has finished, without changing to manual mode. Re: Canon EOS 7D + Canon EF 17-40mm f/4 L USM or Canon EF-S 15-85mm f/3.5-5.6 IS USM In reply to Powerdoc • Apr 1, 2012 On my two crop bodies the 17-55 is much better than the 17-40L at 2.8 and at 55mm and the IS seems to be better on the 17-55.
Canon EF. weather-sealed (splashproof) Canon EF 17-40mm f/4L USM. Canon EF 28-135mm F/3.5-5.6 IS USM. The device is protected with extra seals to prevent failures caused by dust, raindrops, and water splashes. Has a metal mount. Canon EF 17-40mm f/4L USM. Canon EF 28-135mm F/3.5-5.6 IS USM. A metal mount is generally superior to a plastic mount
17 40 millimeter ultra wide angle zoom lens with f/4 maximum aperture for Canon SLR Cameras. Diagonal angle of view 104° 57° 30' 3 aspherical lens elements and super UD glass element create superior optics in all conditions, Closest focusing distance: 0.9 feet
17-40 is one of the worst lenses Canon has regarding over all sharpness from the middle out to corners The lens is not good even at F-8 in the corner
What is the difference between Canon EF 17-40mm f/4L USM and Canon EF 11-24mm F4L USM? Find out which is better and their overall performance in the camera lens ranking.
EF17-40mm f/4L USM. This super wide-angle zoom lens allows you to take wide photographs even with digital SLR cameras which have a screen size smaller than 35mm, covering the range from a super wide-angle 17mm to a standard 40mm. Three aspherical lens elements which come in two types deliver both a wide zoom range and high image quality, while
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    • canon ef 17 40mm f 4l review