Taken with TAL-250K (Klevtsov's system 10" reflector) during 22 nights between 11.04.2022 and 7.08.2022, on my balcony in Brisbane, Bortle 7 city sky.
I shot it in an hour interval between other main objects so only took about 1.5 hour per night.
Total exposure time 34h (H-alpha 8h, LRGB: 26h)
Sub-exposures:
L: 549x2min
R: 85x2min
G: 78x2min
B: 75x2min
Ha 25x20min
More tech details and Full version + Halpha overlay:
https://www.astrobin.com/b4q2oj/
About "H-alpha minus Red" version
By subtracting the red channel from the hydrogen with the images correctly normalized in brightness, we can completely remove the stars, including their galactic background stars that is not resolved. (Some residual artifacts always left, but they are easily removed manually)