The Dark Tower, Magakian 683, Dark Nebula HMSTG 343+2
(Thanks to Ben, Patrick and Mike)
HaRGB and (dramatic) starless Ha versions.
GSO RC6 CF model
2600MM Chroma 3nm Ha, RGB filters
AM5n mount
Astrobin links...
https://app.astrobin.com/i/nj5gts
https://app.astrobin.com/i/moki6w
Cheers
Doug