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Mark,
As the Helix is primarily a narrowband target ( emission ) and at magnitude 7.8 ( very faint ) theres not much value in capturing LRGB with a short focal length rig as it only assists to achieve some colour balance
To pull out the finer detail I would shoot purely Ha , Oiii and Sii with 5 mins subs with at least 8 to 10 hours of data integration
I’ve captured the Helix many times both in OSC RGB and OSC narrowband ( L Extreme) on my newts and the narrowband data is the key to pull out fine detail even with a OSC
Just my 2 cents ……….
Attached image of Helix from 2020 using 6” newt ( focal length 900mm ) under Bortle 8 Sydney LP with L extreme filter , waxing moon and neighbours lights. 2600MC OSC with 135 x 3 mins subs dithered (inc calibration )
Cheers
Martin
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