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I hate to be a wet blanket but isn't this a rather lenghty way to solve a simple mathmatical problem that can be handled by two steps on a hand calculator.
Divide the eyepiece manufacturers listed FOV (in deg) by the magnification F1/F2 to get the true field in degrees.
Or is it something I have missed. I could not run the program on my computer because it needed another .net program download as well.
Barry
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