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However, if I put a reducer on my modest 4" f/6 scope and make it work at f/4.5, while keeping the same camera, I should be capturing data more quickly. Or I do misunderstand something fundamental here?
Some other factors that come to my mind that might be worthwhile consideration are refractor vs reflector with similar apertures (loss of light at mirrors), and working at really fast f-ratios with 3nm filters (wavelength shift).
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