Michael K. Davis' Depth of Field Excel spreadsheet at
http://home.online.no/~gjon/mdofcal9.xls
which should "resolve" all questions by theoretical experimentation.
Especially read the Introduction and the notes sheets for a very fine
discussion of methods to calculate and control DoF, and the limitations due
to film, lens and eye limits.
tOM
------------------- http://groups.yahoo.com/group/ottawa-
photo-clubs
tOM A. Trottier, ICQ:57647974 http://abacurial.com
758 Albert St, Ottawa ON Canada K1R 7V8
+1 613 860-6633 fax:231-6115 N45.412
W75.714
"The moment one gives close attention to anything,
even a blade of grass, it becomes a mysterious,
awesome, indescribably magnificent world in itself --
Henry Miller, 1891-1980
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