[popo]

[quote name='Brightcolours' timestamp='1288636686' post='3892']

You can ALWAYS disregard "pixel count effects" as they do not exist.[/quote]

I really don't want to go there again. While that is the case for same output size, I just wanted to make that clear I am not looking at pixel level.

To answer your question:

Yes, diffraction "limits" show up at the same DOF. And that can be "calculated" simply by the crop factor. If you notice that you see diffraction softening of the image at a certain print size with FF at an f-stop of f11 for instance, you will notice the same diffraction softening of an image at a similar print size with APS-C at an f-stop of f11 / 1.6 (canon APS-C crop factor) = f6.9, so about f7.1.

That isn't answering the question I posed. Wim made a statement regarding magnification being more important for macro photography. I'm asking if, for the same output magnification, for the same diffraction limiting case, is there a difference between the two formats regarding DoF? Both with and without considering focal length too.



I think I'll have to play with some calculators later... haven't done so so far as I'm not sure if they adequately consider high magnification cases correctly.