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Mono flats
Sorry about the stupid question but I'm new to mono imaging. Do I need to take flats through all filters - RGBSHO.
I've seen threads saying definitely yes. Fair enough, but I'm imaging at F4 and the filters are more than 20mm away from the sensor. Surely the filter is far enough from the sensor that it'll have no effect, so could just do it on the L filter to take care of vignetting and sensor dust?
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