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just adjust the weight of the red in the image Mark... 3 hours vs 10 hours is easily noticeable... I've tried it a few times.. I've got 20hrs (mixed between OSC and Ha) of M8... If I stack just 2hrs Ha + 1hr OSC the result is far less pleasing than the 8.5hrs Ha + 11.5hrs OSC. What you get as far as illumination of dim areas etc might not change much unless you increase the sub exposure duration, what does change is the smoothness and the ability to run more aggressive sharpening routines without destroying data..
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