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I tried doing this for a while though not with narrow band. I shot a lot of luminance (KAF8300 CCD) and then used a one shot camera for RGB (Sony ICX694). The problem I had was that my stars from the one shot were larger and wouldn't combine very well with luminance. Perhaps it was the different CCD sensors, or perhaps the lower resolution of the one shot camera, or it may have been poor processing technique on my part. I gave up the idea after trying a few times and being unhappy. Hopefully your trials go better!
Peter
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