MTF (resolution) The EF 17-40mm f/4 L showed an excellent performance in the lab. It's quite safe to assume that the peak performance in the center exceeded the resolution limits of the 8 megapixel sensor of the EOS 350D. The borders are very good though stopping down a little helps to lift up the resolution almost to center quality.
Pros Ultra-wide field of view. Reasonable price tag. Good center sharpness. Cons Muddy edges and corners at 17mm. Some distortion. Noticeable color fringing. The Canon EF 17-40mm f/4L USM
Canon EF 17-40mm f/4L USM Lens Image Quality (the-digital-picture.com) Side note: I have found the site is a little iffy with lenses shot wide open at f/8 though it seems pretty representative of reality. The above link is shown on the 5Dsr which is 50mp. Looks pretty good.
has a silent focus motor built into the lens. Canon EF 17-40mm f/4L USM. Tamron 28-75mm f/2.8 Di III RXD. Lenses with built-in focus motor focus faster and more quietly than lenses without a focus motor which rely on the camera's body focus motor. minimum focus distance.
Hi everyone, I'm using EF EF 400mm f/5.6L USM lens for about a year now. I'm very happy with the results and want to share my experience. Jump to content Member Albums
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canon ef 17 40mm f 4l review
