In that case, FF and aps format would be the SAME DOF,
neither one would have "deeper" dof.
And print size is not a factor either.
For me print size is definitely a factor.
When considering if something is adequately in focus, or within acceptable
DOF, it is really the final result that interests me. Of course not only
print size, but viewing distance affects the overall 'enlargement' of the
image... Certainly the average 10x15 print may be viewed a lot closer than a
2m x 3m wall print, and this can change what CoC is acceptable, and what
falls within acceptable focus.
Still, in the majority of cases, where I'm considering a 10x15 vs an A4 vs a
web image, the viewing distance is similar, and acceptable CoC (and
therefore DOF) varies with enlargement size.
I think, for me, unless I'm contact printing from film (or sensor :), the
original format is less relevant than the overall enlargement of the
'system' - that is sensor, print, viewing distance considered as a whole.
- Peter
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