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I will only add to what Colin wrote, that with a low read noise, given all else being equal, you won't need to expose for as long to capture faint bits as opposed to a camera with a high read noise, even with narrowband imaging. Then the sky glow will be your main source of noise and thus limiting factor as for how deep will you be able to go with your imaging or how long you need to expose for. That's why a low read noise camera with 3nm filters allows for taking pretty decent images with relatively short exposures, including in heavily light polluted areas.
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