Quote:
Originally Posted by Atmos
How have you calibrated them? Bias subtracted the darks and bias subtracted the flats?
Do you turn of Dark Optimisation when calibrating?
When taking your bias’, are they the shortest possible exposure or 0.3s? For some reason, exposures shorter than ~0.3s have some issues that cannot be calibrated out.
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Thanks Colin.
Yes re bias subtraction and turning off optimsation. I even, for the flats, used some darks of the flat duration. But bias was short (0.01s). I will try with longer (and more, as Greg suggests).
As I added in my edit though, it's kind of weird that it seems to be the mix of the two nights that causes the issue. Each night by itself seems ok. To that end, I'm cheating and mixing the centre part of the image from the total stack and using the outer part from the first night alone (which was the moonless night). Will update the image on Astrobin with that. But will also try to update biases as suggested.
Do you use superbias?