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Shooting w/different line filters make for interesting pics on their own as well as a supplement to the RGB data.

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When your finished w/stacking an Ha image this is what you'll see after an initial stretch (your raws will look similar)-top pic.
At this point you'll want to extract the red channel and get rid of the green and blue channels(very little "good" signal mostly noise) and convert to grayscale-bot pic

The top pic is the discarded green chan. and bot blue chan.. Both pics have been stretched to see what if any thing is there.
Ah, now I get it. Very neat.

Dave

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