APS vs FF cropping

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xkaes

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Maybe this has been discussed, but I haven't searched.

Will there be any substantive difference between an APS-sized image and a FF-sized image computer-cropped to APS size -- all other factors being the same (camera, lens, exposure, ISO, image quailty, etc.)? This assumes, of course, a FF camera that has a setting for the APS size.
 
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xkaes

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Thanks, but I don't think that answers my question. I know I can crop a FF image, but if I use the APS setting on a FF camera will the image, in any way, be different from a computer-cropped image.
 

Hassasin

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I don’t think there is one bend that in camera frame ratio crop by any other means but simply using lesser part of available effective pixels. Meaning it’s no different than doing it in post. To me it’s a dumb feature, with only difference being it forces composition within chosen frame ratio.
 
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xkaes

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I agree that it's a feature that is not going to impact camera sales, but it could get more long photos onto a memory card, for example -- because APS images are smaller in "size" -- if that were important.

But that's not why I'm asking.
 

Hassasin

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More photos yes, but image is same except in different frame that is just part of the whole sensor area. It has no effect on how it is recorded otherwise.
 

MattKing

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Two reasons come to mind for the setting:
1) enable practical use of APS designed lenses on a full frame body, with consequent reductions in on-board image processing time; and
2) if the magnification changes in the viewing system, this helps optimize magnification with long lenses - think bird photography - again with consequent reductions in on-board image processing time.
In the latter case, the benefit may only be clear if you are viewing using the built in rear screen - not the optical viewfinder. Of course, if the camera uses an EVF, the benefit would apply to that as well.
 

cerber0s

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No, there shouldn’t be a difference. all the camera does is crop the image for you. If I remember correctly from when I had a camera that could do that, only the jpeg-files came out cropped. The raw files were unaffected.
 
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