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T3D Re: viewer optics

  • From: abram klooswyk <abram.klooswyk@xxxxxx>
  • Subject: T3D Re: viewer optics
  • Date: Sat, 26 Sep 1998 20:15:00 +0200
Tom Deering wrote (t3d digest 366, 25 Sep 1998 ):
>My taking lenses will be 80mm, but the closest decent 
>surplus lens I've been able to find is 98mm.

98/80 = 1.225  and  1.225 * 35 mm = 42.9 mm
Many viewers for 5P format have 45 mm focal length, so they apply
more than the ratio you want to use. You find them acceptable?
It's not the extra mm but the ratio that counts. It's about angles
remember? :-)

Abram Klooswyk


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