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- ...before the motion of the stars is noticeable in the image is approximately 500 divided by the focal length of the lens used. So for a 50 mm lens, you can ...a and telescope give you approximately 1 arcsecond per pixel resolution at 500 mm focal length, at 1,000 mm focal length this will be 0.5 arcseconds per p6 KB (1,114 words) - 17:33, 8 April 2019
