Added 18 frames of Ha. Much more detail and less noise.
NGC 7635 Bubble nebula (C11) Mag. 10, Size 15’x8′ H II region emission nebula Cassiopeia
2018-09-23 21:15-23:07 UT Bright moonlight
200mm f5 Newtonian, MPCC IDAS P2 LPR filter Guided
Atik 460EX, Baader 7nm Ha filter
18 x 300s darks, flats
Nebulosity 4, Photoshop
I did take some RGB colour but as you can see below there is a huge dust mark in it. Normally not a problem as flats will remove it. But when I went to create flats, the dust had disappeared so very difficult to remove. Unless it’s not dust but an out of focus reflection of the bright star? If it is I’ve never seen anything like it in my images before.