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Re: [OM] Lens angles of view?

Subject: Re: [OM] Lens angles of view?
From: "Paul Farrar" <farrar@xxxxxxxxxxxx>
Date: Wed, 4 Apr 2001 14:03:36 -0500 (CDT)
> 
> 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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