Quote:
Originally Posted by Andy01
The original is superb, even more so considering it's taken from suburbia.
Interesting as it is, I'm not sure the Ha is really adding much to the story of M83 though - the red nebulosity present in the original is quite pronounced already, and the overall colour suffers with the Ha RGB blend.
NGC 300 for example, on the other hand seems to benefit from adding in the Ha, so maybe it's just a galaxy by galaxy thing?
A wonderful image regardless. 
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Thanks for your input Andy. I'm not happy with the data for other reasons, not the least of which was variable seeing over the period when I captured the RGB.
Vastly different FWHM's made the star colours rather ordinary.
The H-alpha data proved useful in the end, as I since found when suitably masked, it enhanced the Ha regions without affecting the overall colour.
....but the RGB needs re-visiting, unlikely anytime soon with the Moon now well past 1st quarter. Gotta love this pursuit eh?