Hi Magnus,

I tried capturing flats in two ways but am not satisfied with the results:
1) point the scope vertically with several squares of white paper over the extended dewshield of my William Optics GT71
at an overhead LED rectangular panel in my laundry room. Run Ekos to automate the exposure time in the capture module.
When I do this, there is some kind of periodic interference pattern that shows up as horizontal banding and a very short exposure time.
2) similar to 1) but point the uncovered end of the dewshield flat against a laptop display of a white image and similar
banded results and short exposure time
3) I went back to scheme 1) and manually set the exposure time to 1 sec after trial and error. Attached is a sample as
seen in ASIFitsView

I use one of the Siril scripts to automate processing my OSC lights against bias, flats and darks. When I use these
flats, I see minor noise reduction improvement in my final processed lights.

I have a USB dimmable LED tracing pad from amazon coming today ( tinyurl.com/y36c6gev ) to try out. I plan
on using a small diameter embroidery hoop with white t-shirt fabric to diffuse the LED light.

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