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Peter,
I agree wholeheartedly with Doug, the QHY8 can do Ha without too many issues. Nope, it possibly isn't as good as a dedicated mono, but it does work, and I have quite a few images that will attest to this. Didn't get as far as trying the O3 though.
Think about 20 minute exposures though, I routinely did 20, and often 30 minute shots.
Great fun.
Gary
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