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Forum: Pentax SLR Lens Discussion
07-20-2015, 09:40 AM
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Thanks, this "the above underlined" is where I fail to understand, I thought 58mm focal length is the same no matter what (that 58mm comes with a native perspective - which is really what I am aiming at, not 'compressed' as in 87mm in crop mode (true or not true?). I can understand the exposure (shutter) would be different since it will be metered on a larger view. Note: I am not referring to maintaining the same FOV comparing FF to APS-C by getting closer subject distance; I am talking about 'cropping' the FF image to get the same FOV as the APS-C image.
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Forum: Pentax SLR Lens Discussion
07-20-2015, 07:41 AM
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Interesting discussion here... enjoy all the views of different posters (mostly not fully understand but slowly getting to it). I always have a burning question to ask since I enjoy using a FF lens (Topcor 58f1.4 converted to m42 mount) on my k-3. My understanding is very simple, because of the APS-C sensor, with this lens the FOV will be 87 on my viewfinder as if it is cropped from FF to APS-C size . And the resulting image taken with the k-3 would be same (?) as if it is taken with a FF except that it is already cropped in the camera standing from the same position (if I have a FF to compare).
Now, assuming that the pixel density and photosite characteristics on k-3 and the future FF are the same (this FF camera would have to be somewhere around 48MP), would I expect the DOF and even exposure (shutter, ISO) be the same in both cases if I keep the aperture the same at say f1.4? Thanks...
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