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Cleaned the secondary
Cleaned the coma corrector
Cleaned the protective window on the camera sensor
Took some crude flats last night using a portable led flood light mounted on a bracket about 2m from the end of the OTA. Doubled a white T shirt stretched over OTA
Took an hour of test data on the Star Peacock with moon overhead
Took darks
Took flats using APT flat aid tool at 20000 ADU, 25000 ADU and 30000 ADU
Processed today
No dust donuts
No vignetting
Problem solved and 30000 ADU achieved a cleaner result in the stretched image
Buying an illuminated A3 led drawing pad to achieve a more even distribution of light when taking flats
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