>
> Hello all
>
> Please would someone send me the angles of view of these 3 lenses:
> 28. 50 and 135. Hans v V's site is down for the moment, and Paul
> Farrar's site does not i nclude this information.
>
> I am doing a practice lesson on Friday (I'm on a flying instructor's
> course, and they want me to demonstrate that I can give a
> groundschool lesson) and I have decided to teach my colleagues how to
> select the "right" lens for a documentary photograph.
>
> Thanks chaps and chapesses ...
>
> Chris
> --
> ~~~~>-}^
> Chris Barker
> mailto: cmib@xxxxxxxxxxxxxxx
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
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