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Peter,
What flat panel are you using for your Flats ?
Does it have adjustable brightness levels ?
Are you stretching a white T shirt over the end of the OTA wth a rubber band ?
I use a Huion led dimmable light panel and usually set t lowest brightness or just slightly above.
Photo my little 6” newt in Sydney taking Flats with APT
I set my panel brightness to lowest , Open CCD Flats Aid , Open the Histigram set it to Local , set APT Flats Aid to say 21000 target ADU , press Run then watch the Histogram move around until it stops. If it stops say between 8500 and 35000 ADU value where it says “Range” and the first peak ( RGB ) is located off the left hand side just away from blackpoint , 2nd peak in the middle and 3rd peak no further than halfway along the Histogram then I check Flats exposure value. For no filter used Flat are usually 0.2 sec to 0.5 sec , with L Extreme filter they can be 5 sec to 10 sec long
If the Histogram is not in the correct range then I adjust the light panel brightness ever so slightly or drop the ADU target range to 21,000 or even 20,000 sometimes
The Histogram Range is the key
Hope the above helps
Martin
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