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Off to a good start. Auto dark subtract would be a single dark taken after the first sub. I guess that's not bad but ideally a master dark would be made from something like 16 subexposures. Then again the 8300 chip is pretty clean usually. -20C is bit on the warm side though.
Your STT should be capable of a bit better than that all year round (which is convenient so the master dark is useful all year round with the exception that darks can go stale after a longish period).
Stars are quite good but I'd say at a guess your polar alignment could take a tad more refinement to make them even rounder.
Greg.
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