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Many thanks. The camera downloads each sub to the laptop as soon as it is taken so I can briefly check it if I need to but I can usually tell if it will be good or not by the guiding, I can usually get the guidestar to sit right on the virtual reticle to the limit of the seeing.
I have the image very highly magnified so each pixel is a few mm across on the screen and usually have a star bright enough for exposure times of less then 100 milliseconds with the ZWO guide cam. If it is windy though the guidestar bounces around so I really need fairly calm nights to image
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