Hi Guys
Ring Nebula RCW104 surrounding WR75. Big version
here This image is with narrowband filters and is very dim and was difficult to process. Not oft imaged, it took over 120 hours of exposure time to get to this a bit noisy effort. The ring nebula (OIII, mapped to blue) is very tenuous. This is in a busy starfield so only bright stars are shown for clarity (in RGB).
Taken on my RCOS 10" RC Scope at f9, SBIG STXL6303E Camera and PME mount at itelescopes Siding Spring Observatory.
Processed with CCDstack, Star Tools and Photoshop.
Several processing features in Startools made processing this possible which would have been very difficult indeed with regular linear processing all other apps use!.