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Forum: Pentax SLR Lens Discussion
08-14-2017, 07:38 AM
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It took me a while to get my head around the crop versus full frame thing as far as DOF goes. Yes, the focal length of a lens goes up by 1.5 when you put it on an APS-C camera body. But you also "gain" depth of field because of the smaller image - roughly one f/stop. This means that a 50mm f/1.4 lens will take about the same pictures as a 75mm f/2 on a full frame.
This explains why cell phone cameras have such enormous depth of field - it is down to the teeny tiny sensor. It also explains why a medium format camera is not easy to focus manually - bigger image, less DOF.
Another APS-C vs. 35mm example - a 200mm f/2.8 becomes a 300mm f/4 and not a 300mm f/2.8. As far as DOF goes anyway. The extra light from a faster aperture is still yours to take advantage of. Hope I have it right and that this helps.
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