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Is that a planet orbiting that star?
Hmm not sure how you would go about collimating using this method, it seems a little long timed. Compared to say a visual star test or laser. Wouldnt your mount have to be taken into account aswell? I dont think there is any mount available that could track this well to perform such a test over that period of time exposure. Maybe shorter say 5s on a brighter star maybe? but then you may get blow out which would give you inaccurate results too. Then again, I may be barking up the wrong tripod here.
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