Gary Miller (gmphotos@earthlink.net)
Tue, 15 Jun 1999 21:20:16 -0700
I have a few questions about optics and depth of field for those on the list
that are into these areas. I know that we do not discuss optics too often
so maybe this can open up some new areas.
I wanted to know how depth of field varies between formats. Let me
elaborate. I know that DOF decreases as you get closer to an object, hence
one of the difficulties in macro work, and also decrease with longer focal
length lenses. But how would the DOF differ, or not, between the following
three situations;
1) a 35 mm lens on a 35mm camera
2) a 65 mm lens on a medium format camera (35mm equivalent field of view)
3) a 120 mm lens on a 4"x5" camera (35mm equivalent field of view)
All three of these lenses have equivalent fields of view around 55 degrees.
Thanks for enlightening me.
Gary
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