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Thanks for the nice comments guys.
Yes - there are nice tight stars - an FWHM of 2.2 arc seconds on Ha really helped.
That is the best I ever measured in Melbourne
Greg has a good idea with adding blue.
I may revisit the processing - I always re-process every image eventually.
The Ha was combined as 50% luminance so it affects all RGB channels.
I find the FWHM of Ha is always better than any of LRGB & adds real punch to any nebula picture.
The 50% of real luminance combined helps to decrease the noise of Ha narrow band -
filling in the gaps between the noise "dots"
I found most of the RGB signal was in the red channel so that is why
the overall result has an orange colour.
The result of increasing the blue was shown in a pic below.
It is perhaps better but I'm still deciding.
I looked around the internet & some people have a lot of blue
yet the ESO link I gave shows their effort has an orange colour as
well as many other pics that I found.
Looks like I need an O3 & an S2 filter too for all narrow band .
cheers
Allan
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