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Field rotation calculator
Guys - Does anyone have a field rotation calculator? I would like to know what the maximum acceptible polar alignment error is for a given CCD, focal length, exposure and declination.
I have a Tak FSQ with an STL which may be some people's idea of heaven but it's not all roses. Field rotation is a harsh mistress with such a big, flat and sharp field. I have been drifting for years but am gearing up to take on the polar scope on the EM-200 mount and want to know if the 2 arc mins it can achieve are enough to get me out of trouble for 15 min exposures. My arcs/pixel is 3.
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