At 05:26 PM 10/27/01 -0400, you wrote:
For close up work just multiply your optimum pinhole size, obtained with any
of the formulas available out there, by the "correction factor":
Correction factor = SQRT ( O / I + O )
where O = distance pinhole lens to object being photographed
and I = distance pinhole lens to film
SQRT stands for square root of
Guillermo
Guillermo, I don't remember ever seeing your correction formula before. Is
that theoretical, or have you tested it?
Gregg
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