angle = 2*arctan(R/F)
where F is focal length and R is radius on the film
R = 12mm vertical
18mm horizontal
21.5mm diagonal
diagonal 75deg for 28
47deg for 50
18deg for 135
for lenses longer than 50mm you can use 2400/F as a good approximation
Thanks Paul, and Robert G, for your replies. I shall file this
little gem Paul.
Chris
--
~~~~>-}^
Chris Barker
mailto: cmib@xxxxxxxxxxxxxxx
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