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I agree, but I cant seem to get nice looking guide stars, they actually look like a quarter moon and not round. The camera is more than likely not on axis, but yep Ill try on star cluster. BTW what exposure time would you for the sti for use for say mag12 object like a gallaxy. By the way Im going 20sec is not long enough. Maybe I need to check the prism again, but by what Ive read this is not overly critical.
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