Sigma SAFZ4356 Review: Sigma 17-35mm f/2.8 EX Aspherical HSM Lens for Pentax SLR Cameras. I recently started wedding photography, and I must say this was a great purchase to handle my group portraits. I don't use the f2.8-4.0 range. I mainly use f5.6 or f7.1 for my group shots. This lens is very sharp at f4.0 but for group purposes f6.3 is my target. I use this lens on my Pentax K5 and Kr. The high ISO ranges on my cameras compensate for not having the steady f/2.8. In today's DSLR market, if a camera has pretty ISO ranges, having a steady f/2.8 is ... Read more »
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