Sorry if this is a topic that has been hammered to death. I did research it and didn't find much, and what I did find was at least a year old, often much older.
Up until recently I'd been using a DMK41 for my solar h-alpha imaging. I recently acquired an asi178mm. Love the camera (the small pixels work great when using a reducer to get full disk images), however when pushing the wavelet sharpening as much as I did with the DMK, I get some very obvious pattern noise. I can add blur in wavelets to remove it, but then I lose a decent portion of the sharpening. What I did find while researching seemed to indicate that pattern noise manifests itself when using USB3, but is diminished with USB2, but obviously the latter is a much slower frame rate than the former.
Included is a sample of what I'm talking about. I've pushed it a bit further than what I could normally do with the DMK just to make it extra obvious. Is this a known issue? If so, is there a simple remedy, or do I need to revert to using usb2? Or is this just a natural limit of the camera and all is working as intended?
Capture was on a lunt 100, no reducer or powermate. During the capture I used max frame rate, USB 3.0, gain of 0, I forget the shutter speed but it was on the very low end, histogram pushed to the right without clipping, and a ROI of about 75% of max, giving me about 50-60fps. Image is a stack of about 750 frames.
Let me know if you need any additional information, and thanks in advance!
Edited by ammonthenephite, 02 April 2020 - 07:51 PM.