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There is an IIS member who regularly posts pictures taken with his 12" lx90, that is alt azimuth mounted , using exposures around 20 -30 seconds and they are very good. He uses 100's of subs. If you accurately align your telescope During setup you too should be able to manage such exposures at iso 1600. Your telescope has half the light gathering power of a 12" but you should still achieve some good pictures at those exposures.
Regards philip
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