hi brett,
yes i have the same problem as you. i take twilight flats, which isn't too handy in the middle of winter... i need to retake some actually as i've changed a part in the imaging train, and was thinking off attempting t-shirt flats (think bedsheet) in the direction of a closeby flood light... well i'm hoping it will work.
twilight i find just after sunset usually to the south before any stars come up in the flats. avoid cloudy areas or too low to the horizon.
Russ
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