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F2.8-4 Vs f4 constant?
F2.8-4 Vs f4 constant? A camera shop recently told me my sigma 18-50/17-70 f2.8-4 (I run 2 mounts and have one on each camera) should be replaced with a constant f4 lens. This conversation came about when they tried to sell me f2.8 and I wasn't interested due to weight and cost, and more importantly having 0 issues with what I'm running. They insisted the f4 would be ...
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