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Flats - can I resize binnedx2 flats?
I've made a concerted effort lately to sort out my flats for the QHY9, where the main issue is getting decent ADU counts (no higher than say 23000 usually for this camera I believe) for each filter while keeping exposure time >3secs to avoid shutter artefacts.
When I go to shoot flats for binnedx2 the exposures need to be quite a bit shorter however, potentially less than 3 secs as I can't dim my light box enough. I've thought about adding layers of T Shirt or changing wiring, but is it really going to matter if I shot all my flats binnedx2 (assuming I made box dim enough) then resized them up for unbinned work? Surely the vignetting change across the FOV is fairly smooth?
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