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Message: <blockquote data-quote="Clovishound" data-source="post: 789998" data-attributes="member: 50197">Doing a little napkin math, at 10 seconds, the proper F stop for the moon at ASA 100 would be approximately 10 stops down from F16. This is assuming you use the sunny 16 rule for the sunlit moon surface. All the F stop charts I see usually stop at F64.  This would be way beyond that. My point is movement of the moon is not an issue for pictures exposed properly for the moon. Stars, requiring so much more exposure, are a different ballgame, despite moving more slowly. Now, if you are using a shorter focal length lens, are exposing for stars or some other much dimmer subject, and are not interested in any detail in the moon itself, then you could get into shutter speeds that produce an arc or an oval vs a dot.</blockquote>