Just got this camera and had first light last night. Was processing my flats and noticed really weird checker pattern.
Gain111, 10 offset, -10C, 0.58sec, USB2 (shouldn't matter with ram buffer), ZWO usb cables, flat via LED light panel.
This shows up only in the flats, not the dark flats. Never saw this with my ASI533.
Showing the a zoomed section of the stacked, calibrated flat because it shows the checker really clearly, but it is present in all filter channels, in the raw, uncalibrated frames.
My first intuition is that these are discrete LEDs of the panel, but that doesn't make sense with the density of these and the panel appears to be an edge lit. Plus, with the telescope focused at infinity, even if discrete, they should not be this well resolved.
Full frame showing preview area, and zoomed preview to show checker.
Edited by DrGomer, 16 May 2020 - 01:37 PM.