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Put at its simplest, deep sky astrophotography, as opposed to planetary, frequently requires exposures of many minutes, and GoTo systems [even when fitted to equatorial mounts] do not have the precision to keep stars absolutely motionless in the frame so that they appear as pinpoints. Obviously, any inaccuracies in the GoTo will result in elongated stars.
raymo
Last edited by raymo; 13-05-2019 at 12:47 PM.
Reason: more text
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