Quote:
Originally Posted by Bassnut
If you havent got Lum, just combine RGB you have for Lum, its the same thing.
I like Ha as lum for several reasons, but yes it can cause damage and is becoming less popular. If there is SII and OIII outside Ha regions, then those 2 will be suppressed with Ha as lum. If Ha is zero in a spot with SII or and OIII, those 2 will be invisible.
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Quote:
Originally Posted by gregbradley
I agree Fred. Sometimes you can blend in a bit of Ha as luminance and it adds something. Not a lot say 10-15% opacity.
Best done probably as a hide all layer mask and selective add in for detail.
Greg.
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Thanks for that advice. However, the RGB was taken with 4+ arcsec seeing, so any luminance that I can extract will be poorly resolved and not compatible with the <2 arcsec Ha. Will have to try again next year. Or maybe I should bite the bullet and really go to the dark side - and get an OIII filter.
regards ray