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Re: various questions


  • From: erker@xxxxxxxxxxxxxx (Greg Erker)
  • Subject: Re: various questions
  • Date: Wed, 28 Oct 1998 11:00:16 -0600

>Also, regarding the string a while back on small Sputnik aperatures.
>I took my shots at + - f22 and cannot imagine them being sharper.
>I couldn't notice antything I'd term "image degradation."
>I remember reading that at tiny aperatures, the light can
>somehow degrade - but is this really only relevant to the
>absolute size of the pinholed aperature? F22+ on 75mm 6x6
>format is still a much bigger opening than F22 on shorter
>35mm film lens.

  As John B will point out. This is correct when
you are viewing the resulting slide ortho. Angular
resolution (which is what we care about) is dependant
on the size of the hole, not the f#.

  So if f16 is okay on your Realist with 35mm lens,
then f32 is okay on your Sputnik with 75mm lens.
The holes are roughly equal in size (2.2mm vs 2.3mm).

  From the folio. I'd say that f32 shots look fine
and some f45 shots I've seen also looked sharp (in MF).

Greg