Chuck raises a good point. Though FL has a minimal effect on total dof
the distribution around the focal plane is altered. I believe it is
close to 60/40 distribution rear to front at super WA and approaches
50/50 at longer FL. So when the dof calculator asks for the FL, I will
put it in.
Mike (attentive student of Dr. Focus)
In the meantime, when your DOF calculator asks you for the focal ratio
AND the focal length don't refuse to tell it the focal length on
grounds
that it's immaterial. :-)
Chuck Norcutt
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