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P3D Re: focal length


  • From: "Ray Moxom" <raymoxom@xxxxxxxxxxx>
  • Subject: P3D Re: focal length
  • Date: Thu, 11 Feb 1999 04:28:35 PST


In P3D-3194 Rod Sage <rsage@xxxxxxxxxxxxxxxxxxxx> asked: 
"Could someone one the list tell me if there is a formula for converting 
close up lenses to focal length. For example, what is the focal length 
of a +1,+2 etc. close-up lens. I guess these are diopters. Should I be 
asking how to convert diopters into focal length. I want to order some 
lenses from Edmund Scientific."

Yes the +1, +2 etc are dioptres. Just divide the dioptre into 1,000 and 
you have the focal length in mms. Also when the camera lens is focused 
at infinity the focal length of the CU lens is the distance that the 
subject should be from the film plane. (Australia uses UK English)

Ray Moxom <raymoxom@xxxxxxxxxx>


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