The Bubble nebula (NGC 7635) in Casseopia is such an amazing target! Its bubble is formed by a super hot star emitting radiation outward in the HII region. It is a magnitude 10 target (rather dim) and so I was not sure if I could get much data from it, but I am pleased that the bubble was so well-formed in the result! The light pollution filter under dark skies allows for longer exposures and more HII data to get through without blowing out the exposure from skyglow.

13" Reflector
Skywatcher EQ6-R equatorial mount
Canon 6D unmodded
CLS filter

A one hour integration of 100-second shots. Stacked in Deep Sky Stacker. Finished in Photoshop