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What Rick wrote makes sense to me. I have found that with my camera (4e read noise) there is not much benefit in going longer than 15 minutes (with narrowband imaging) for the fainter DSOs, also due to shallow wells and sky glow. For bright DSOs, such as Carina, 1 to 2 minute subs with narrowband filters is really plenty with my camera.
Maybe the next generation of sensors for low light applications (that will also be affordable) will have near zero read noise? That would be very nice.
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