Added 18 frames of Ha. Much more detail and less noise.

Object IDNGC 7635 Bubble nebula (C11)
Mag. 10, Size 15’x8′
H II region emission nebula
Cassiopeia
Details2018-09-23 21:15-23:07 UT
Bright moonlight
Telescope200mm f5 Newtonian, MPCC
IDAS P2 LPR filter
Guided
CameraAtik 460EX, Baader 7nm Ha filter
Exposure(s)18 x 300s
darks, flats
CaptureAPT
ProcessingNebulosity 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.