Sigma 735-101 Review: Sigma 50-500mm f/4-6.3 EX RF HSM Lens for Canon SLR Cameras. I got this lens to replace my 600mm reflector which is fixed aperture with a dreadfully small depth of focus. This lens is spectacular by comparison: excellent focus depth, with F4-6.3 it is light-strong enough to get away with a lot of stuff that reflector lenses don't allow as they suck so much light. I do motorsport and nature photography, so fast exposure times are key, and this lens allows for good flexibility in difficult light conditions or where you need to be super-quick without compromising depht-of-focus. I use this ... Read more »
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