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That's a good result for a 450D that's not modded, the QE of those older cameras is about 40%, compared to the new CMOS cameras of 90% QE. You may have to add another 5hours to what you have to bring out more red (Ha signal)
I am curious as to why you took bias sub frames, when you also had dark flats. There is no requirement to take bias frames when you have dark flats, you do not want to subtract the bias twice from your light sub frames.
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