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Overall not bad. The main critique here is about 2 things. The stars look harsh and lack colour. That to me means the stars are slightly overexposed which seems to be a whole lot easier to do with these CMOS sensors.
Secondly the Ha areas did not come out very well. To keep it in perspective 1:33 hours is a very short exposure time even for CMOS.
What settings are you using with your QHY268C? I have a couple of QHY cameras. The QHY600 is basically the same sensor just larger.
Try mode 2 extended full well mode, gain 0 offset 10. That works with preserving the stars because it makes the full well capacity (how many electrons each pixel can carry) much much larger. Its the full well capacity that affects the star colours more than a lot of other things. Too small and too long an exposure especially with high gain will give you white stars with no colour pretty quickly.
To get the most out of Ha objects perhaps one of those L extreme filters is the go.
Greg.
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