"The EF17-40mm f/4L USM is a lightweight ultra wide angle Canon EF zoom lens. It is especially well suited for use with digital EOS SLR cameras with a focal length conversion factor higher than 1." ...

This lens, which has become almost legendary amongst Canon users, has been around for a little while now. There are a number of new or updated contenders on the market in what has been a competitive ...

Last night we took the new 50-megapixel Canon EOS 5Ds with the Canon EF 17-40mm f/4L USM lens to the financial City of London district to test out the 5Ds's long exposure capabilities. Here are 55 ...

We've been trying out the new Sony A7 III full-frame camera with some older Canon f/4 L series lenses - namely the EF 24-105mm F/4L IS USM, EF 17-40mm F/4L USM and the EF 70-200mm F/4L USM - mounted ...