I wonder if you could do some cheat, like an ROI frame around bright stars and then somehow used that to calibrate out aberrations... or instead of star focus do a field focus?
just thinking out loud.. you're right, it would be aligned but i guess some creativity could help clean it out besides the usual PI tricks
Field focus I can test here in a moment, but I dont think it will have any effect at all.
I think the lesson on Vega is, dont image Mag 0 stars. It wont end well. Alnitak is Mag 2 so would have less of a chance of causing the problem. I do think its fascinating that the TOA130 produced very prominent grid effects with the IMX455 while the KAF-16803 had to crank the exposure time up.
The per um^2 read noise of these cameras isnt that different:
- FLI 16803 - 9 micron (81 micron squared) - 8e noise - 0.10e noise per micron
- ASI 6200 - 3.76 micron (14.14 micron squared) - 1.6e noise (at 100 gain, bin 1x1) - 0.11e noise per micron
The QE is different, but I am not so sure that is enough to cause the discrepancy. The 16803 is much further away from the filters, which may be providing a dampening effect on the appearance of the grid pattern.
Edited by rockstarbill, 30 September 2020 - 10:07 PM.