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Remember to distinguish exposure time from guiding interventions. When I say 100 to 500 ms for an exposure, this is in the context of a 1 to 3 second guiding interval, and determines how many frames I stack with the ASI120MM (and how bright and well characterized the guide star is). Note, if you can't see any guide stars at 500 ms with your ST-i, then something is wrong - you should be seeing lots. I suspect, as noted above, that you are WAY out of focus.
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