|
I would say that it is likely to be fixed pattern noise that isn’t entirely being removed. I’d suggest that it is due to the 2 pixel dither being a bit small when stacking 2000 odd frames.
The checkerboard pattern was something I noticed with both the ASI1600 MM-S V2 and QHY163M but it’s also been chatted about with other CMOS sensors. The other question is whether or not you use bias for calibration? It can be better to skip bias altogether and purely use darks.
|