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Some direct experience.
12" f8 RC with SBIG STXL11000 which is about 0.76" per pixel
12' f4 Newt with QSI683 which is about 0.92" per pixel.
The image scales are not too dissimilar.
Same target to get similar looking results.
12" RC 39 hours
12" Newt 15 hours
Imaging speed does appear make a difference at similar image scales.
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