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primus96
Joined: 13 Nov 2003
Posts: 225
Location: Yorkshire, United Kingdom
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 Posted: Fri May 12, 2006 9:04 pm Post subject: |
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I have heard of a formula to paste in a spreadsheet that lets you calculate the image circle from the focal length and the coverage in degrees.
I am sure I heard of it through this forum.
Anybody got any idea? |
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Dan Fromm
Joined: 14 May 2001
Posts: 2146
Location: New Jersey
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| Posted: Fri May 12, 2006 10:05 pm Post subject: |
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On 2006-05-12 14:04, primus96 wrote:
I have heard of a formula to paste in a spreadsheet that lets you calculate the image circle from the focal length and the coverage in degrees.
I am sure I heard of it through this forum.
Anybody got any idea?
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Hmm. Didn't you have to learn trigonometry in school? Have you no resources of your own?
Diameter of circle covered = 2* tan(angle/2) * focal length. If you're using Excel, its tan() function wants the angle in radians, so you want tan(radians(angle in degrees)). |
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