FM Reviews - Canon EF 17-40mm f/4L USM - fredmiranda.com: Specialized in Canon - Nikon SLR Cameras,

I bought this lens used when I moved to full frame and could no longer use my Sigma 10-20 (which I loved). The 17-40mm range is perfect for shooting functions in tight spaces on a full frame body. Sharpness is excellent but not up to the best 'L' lenses.

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