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Paul
I capture some flats last night using an A3 led sketching panel which has touch control adjustable illumination
I fashioned a piece of cardboard cut a hole the size of the OTA and sprayed it Matt black then attached it to the panel with a 20mm stand off surround
Manually slew the scope vertical in non tracking mode and sat it on top
Took 15 at 20,000 ADU, 25,000 ADU and 30,000 ADU ( HDR gain 0 )
Flats turned out ok but one corner of the frame is not uniform. The 20,000 ADU seemed to be the best of the three settings
I used these flats in my NGC 104 Tuc 47 image posted today in Beginners AP
Definitely corrected the vignetting and 2 faint dust motes
Cheers
Martin
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