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Thanks Jon. I’m using the ASI1600MM-Pro at a gain of 139, offset 21. It was just one of those recommended settings from somewhere (?) and my dark library is mostly at that gain and offset. I really should explore more! The f4 Newt really sucks in the light although with the 1.25” filters there is a bit of vignetting, especially noticeable with the O3 filter. The O3 filter also seems to really highlight what I assume are colimation errors. Waiting on a 2” sight-tube to help sort out the secondary.
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