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by dakr
765 days ago
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The issue is rotation of the sky about the line of sight axis. Whether the exposures are short or long, over time the sky will rotate more than what an in-camera system can compensate for (the amount of rotation depends on location/time/direction). Over these timescales a rotator that can perform larger movements is needed. This can be provided by an equatorial mount or an internal rotator. |
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