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The first pic looks good Gary! Real good!
I agree with Marc, SII needs heaps of exposure..
Also, with narrowband, dont bother with a L channel... use Ha or OIII or a blend of both as a luminance. I've seen methods online of using Tone Mapping to create a Lum channel from SII Ha and OIII data... I would imagine this can be applied to just Ha and OIII if thats all you have to work with... I'll dig up the link for you shortly..
Using Ha Ha OIII OIII as L R G B works well... also you could try blending Ha with OIII with a ratio of say, 70:30 as the green channel, and using straight Ha for R and OIII for B.
There are many techniques out there, and the beautiful thing about narrow band is that none of them is either right or wrong... Just different.
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