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Focus rules of thumb


  • From: Sarah Morgan <sarah_morgan@xxxxxxxx>
  • Subject: Focus rules of thumb
  • Date: Mon, 12 Jun 2000 16:00:00 -0400


What are the general rules of thumb when adjusting focus and exposure to go
from regular color film to IR film (EIR 135-36 exp).  Is there a difference
in the angle the wavelengths of light strike the film in visible v. IR
range?  How critical is the exposure.  These questions are for shooting
around 10 foot away from subject (not aerial shots).  

What filtration effects does an overcast day have v. a sunny day or partly
cloudy day.  What setting must you change for each circumstance?

Cheers,
Sarah
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