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Not sure what mount you’re using Peter but when I had an EQ6 I found the 1-2s mark to be optimum.
Suavi is correct, they’re hot spots that will largely be removed when you calibrate the data. You’d be best setting up a dithering pattern for the long term though. Although what you have at the moment will statistically remove hot pixels you may end up with a form of PRNU; walking noise. You won’t notice it until you start stacking for longer integrations and it’ll really limit how much stretching you can do for the fainter signals.
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