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Forum: Pentax DSLR Discussion
02-29-2016, 09:10 AM
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Forum: Pentax DSLR Discussion
02-29-2016, 08:44 AM
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Look at any DoF calculator. if all other variables are held constant and you only change sensor size, the smaller sensor has a narrower DoF.
Lets say you have a FF with an 85mm lens and an APS-C with 55mm lens. If you are holding FoV as a constant then you have to be changing the focal length of the lens (55mm vs 85mm) or you are changing subject distance. If you change from an 85mm to a 55mm you age going to a shorter focal length which gives you more DoF. If you keep the same 85mm lens and put it on an APS-C then you have to back up to keep the same FoV. Increasing subject distance increases the DoF. A 55mm lens can't render like an 85mm lens regardless of sensor size, but they are close enough that most people don't care. Changing the subject distance also changes the compression of the image regardless of sensor size, but again probably not enough that anyone will care. Then you have the compression effect of magnification that has to happen when you enlarge the APS-C image to match the FF.
Actual DoF though can be totally controlled with any size sensor. You just need the right glass.
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Forum: Pentax DSLR Discussion
02-29-2016, 07:52 AM
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As much as I have bitched about Pentax not having a FF, I have to buy one.
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Forum: Pentax DSLR Discussion
02-29-2016, 07:32 AM
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You have 100% control of DoF with either format. Technically smaller sensors have a narrower DoF when controlling for all other variables.
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