Fifty hours on the Crescent Nebula

I was looking through some old data and realized I had a couple of sets of data on the Crescent Nebula that I could combine. Thankfully, I archive all of my flats, darks and lights so I can go back and recombine old and new data to make new images. This one is just about 50 hrs total exposure and brings out some detail I wasn't able to see before especially in the oxygen shell.

The Crescent Nebula (also known as NGC 6888, Caldwell 27, Sharpless 105) is an emission nebula in the constellation Cygnus, about 5000 light-years away from Earth. It is formed by the fast stellar wind from the Wolf-Rayet star WR 136 (HD 192163) colliding with and energizing the slower moving wind ejected by the star when it became a red giant around 250,000 to 400,000 years ago. The result of the collision is a shell and two shock waves, one moving outward and one moving inward. The inward moving shock wave heats the stellar wind to X-ray-emitting temperatures.

Technical Details

Integration time: 50 hrs of exposures from my Bortle 4/5 backyard near Halifax, NS

Telescope: Skywatcher Esprit 120 ED APO

Imaging Camera: ZWO ASI 294MM

Guiding: Starfield 50mm guide scope with ZWO ASI290MM guide camera

Filter: Optolong Ha,Oii and RGB for the stars

Mount: Skywatcher EQ6R-Pro

Calibration: Flats and flat darks

Hardware Control: ASIAIR Pro, Pegasus Power Box and ZWO EAF

Processing: The selected images were pre-processed and processed using Pixinsight.

As always constructive criticism is welcome and appreciated. I am always looking for ways to improve my image capture and processing skills. Thanks for looking.