I decided to image the eagle nebula next. I was able to get about an hour of Ha data last night as I wrapped up the elephant trunk nebula.
I had a couple clear nights in a row and was able to capture 50 300s subframes in each Ha, SII, OIII. I applied a dynamic background extraction to each channel as well as a contrast boost before running pixel math to generate the SHO image.
Here is a zoomed in crop of the central nebula region:
| imaging camera | ZWO ASI 1600MM Pro |
| guide camera | ZWO ASI290mm Mini |
| mount | Skywatcher EQ6-R pro |
| telescope | Explore Scientific ED102 APO |
| exposure settings | Optolong Ha 7nm 1.25″ filter exposure: 300s gain: 139 cooling: -15C |
| stacking | 50 Ha lights 50 SII lights 50 OIII lights 30 darks 30 flats 30 flat darks |
| processing | PixInsight |