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Formula for calculating the FoV of lenses?

 
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jan normandale



Joined: 13 Nov 2007
Posts: 30
Location: Toronto Canada

PostPosted: Tue Oct 27, 2009 7:46 pm    Post subject: Formula for calculating the FoV of lenses? Reply with quote

I know we all talk about image circles and lens sizes but I'd like to calculate the field of view of lenses. I went to our FAQ's and most of the formulae regard hyperfocals, image circles etc

Can someone steer me to a set of formulae for determining FoV for various lenses using a 4x5 back? Better still would be one of those websites that have calculators built in.

thanks Jan
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45PSS



Joined: 28 Sep 2001
Posts: 3229
Location: Mid Peninsula, Ca.

PostPosted: Tue Oct 27, 2009 8:02 pm    Post subject: Reply with quote

See fcalc @ http://www.tangentsoft.net/
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Dan Fromm



Joined: 14 May 2001
Posts: 1887
Location: New Jersey

PostPosted: Tue Oct 27, 2009 9:40 pm    Post subject: Reply with quote

If the lens covers 4x5, the angle that the film will see, in Excel, is =2*degrees(atan(76/f)), where f is the lens focal length in mm.
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jan normandale



Joined: 13 Nov 2007
Posts: 30
Location: Toronto Canada

PostPosted: Wed Oct 28, 2009 12:26 am    Post subject: Reply with quote

45PSS, thanks for the link it looks like a good one

Dan, I had a hunch I'd hear from you. Thanks for the XL formula. How've you been? Did you get any photography in this summer?
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