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Comparing flats take at f5 v's f15
A question....
Have you ever compared your flats, taken at fast f ratios to flats obtained at higher f ratios???
I'm cleaning my cameras, ASI 1600MM and ASI 174MM....
Usually used with ED80 (f7.5) and sometimes with x2.5 PM (f19) for solar imaging.
I find a "good" flat taken at f7.5 looks terrible (!!!) when taken at f19.
The slower f ratio seems to show up ANY dust/ motes on the sensor/ cover plate.
Have you found the same?????
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