Thread: pixel to object mapping formula
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Old August 21st 11, 05:45 AM posted to sci.astro.amateur
Chris L Peterson
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Default pixel to object mapping formula
On Sat, 20 Aug 2011 20:35:04 -0700 (PDT), Ron Cuaz
wrote:

tangent of (12.7arcmin/2) is 0.1113 and multiply it by 2 * 5 is
1.113m. I wonder how you got 0.018 m?

tan(12.7 arcmin / 2) = tan(0.1058 deg) = 0.0018. Times 2 times 5
meters is 0.018 m.