"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." ...
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 ...
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