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Thanks for this! I believe a lot of imagers have the wrong focal length.The correct length is to the CCD. According to my system I was imaging Jupiter the other day at F15 (C11 F10 + 1.5x barlow) but with the flip mirror & image size I knew it was more then this. I applied Anthony's plate scale and it was F20.2!
From this you can take your correct focal length and divide by your pixel size to get your Arc/pixel.
Jon Bosley
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