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In regard to imaging, the pixel size of your camera matters. If I have an 10" f10 scope and camera combination imaging at 2" per pixel and then go to a 10" f5 and a new camera with half the pixel size, then I will still be imaging at 2" per pixel, so we get the same number of photons hitting each pixel well for both setups, and there will be no difference in speed between the two combos. (As long as the QE of both cameras is the same, which is unlikely, so this throws in another complication.)
Geoff
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