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Rene,
I use the processing software Startools V1.7 ( latest ) which has a Compose module designed for processing OSC Duoband or multiband data
It creates a synthetic luminance file and combines with RGB to make a composite which can be used with many presets made consisting of Ha S11 OIII variations etc.....
It works pretty well but its not true narrowband like from a Mono and individual filters and will never be as good either , but at least you can image under horrible skies and create a decent image ( nebulas only of course)
Here’s an image/s of NGC 3372 Carina I captured in March under Sydney Bortle 8 light polluted skies and an 80% moon using my 2600MC and an Optolong L Extreme filter processed in Startools V1.7 Composite module OSC narrowband
Cheers
Martin
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