| Correct again. I have done some more focused observations based on the
| comments posted here and indeed I have discovered that the field is
| not in focus as much as I had thought it was (strange how my
| perception based on informal use was different than when I really
| focused (pardon the pun) on the issue). But I still maintain that the
| DOF you see in the viewfinder during normal focusing is greater than
| what you see in a final print if you shoot wide open. I'm puzzled as
| to why this is, but I appreciate everyone's comments. There is no
| reason this should be camera or lens specific is there?
Perhaps the focusing screen is more tolerant of slight misfocus than
is the film emulsion itself; particularly away from the center, which is
designed to support more critical focusing.
One possibility for this is that the depth of the light-intercepting grain
structure of the focusing screen is probably greater than that of the
film emulsion, and would therefore tend to 'smudge' precisely in-focus
points to look much like the slightly out-of-focus points.
Another possibility is that the lateral dimensions of the grain structure
of the focusing screen are greater than the grain structure of the film
emulsion, blurring the distinction between totally in-focus and slightly
out-of-focus points.
Other than that, your guess is as good as, or possibly better than,
mine 8^)
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