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I think that's the whole point of the bigger scope, the same result but "in a fraction of the time". I have a 150mm RC that does a good job but at f9 takes 4 times as long to get the same result as my 10" f4'8. Resolution is also a factor to consider, a larger aperture will resolve finer detail (assuming that the scope is well collimated and the camera sensor is a good match for the ota). And I guess the longer focal length of the larger aperture scopes is also better for smaller DSO's.
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