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Forum: Pentax SLR Lens Discussion
11-06-2017, 07:28 PM
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Wow - this thread took off quickly. Most of what I have is crop for my APS-C kit, however I think actually an argument can be made that a crop camera with a FF lens will perform even better since it is only using the "inner" part of the image circle. Thus no soft corners etc. The F stop thing is just a load of crap. F2.8 is an F2.8, yes F2.8 is different on a full frame vs. crop BUT it is still the same F stop and will perform different just based on the size of the sensor. It doesn't mean me using the D FA 70-200 * on my K-3 II or KP isn't getting the benefit of the fast F stop, F2.8 but rather is behaving like any other F2.8 lens FF or crop on a Pentax APS-C system.
If Pentax had a decent F2.8 that went to 300mm (FF eq.) that was a crop I would have bought it, but FF was my only option. I am pleased with the D FA 70-200 * on my "humble" crop bodies. This is a load of crap - moving on.
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