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Slit width - Distance to fim plane

  • From: Robert Durn <Robert.Durn@xxxxxxxxx>
  • Subject: Slit width - Distance to fim plane
  • Date: Mon, 28 Jun 1999 07:50:40 +0100

Hello to all,
Does any one have any thoughts or answers to how wide a slit should be and
how far it should be from the film plane? I have been building a camera with
a 24mm Nikon lens using 120 film stock and a 1mm slit placed 10mm from the
film plane. 
I still can't get a really sharp image even at f16. The film transports
around a drum omega style and has an image of 149.5mm for 360 degrees.
Also, I know that the rule says 2 x focal length x Pi or 150.796mm but is
149.5mm close enough?
 
Can any one help?
Many thanks, Rob Durn Stockport UK

also at Robert.Durn@xxxxxxxxxxxxxxxxxxxx