Done in RGB before, narrowband this time.

Object ID Medusa nebula
PK205+14.1, Abell 21, Sharpless 2-274
Details Planetary nebula, Gemini
Surface brightness about 16
20-04-13 22:06 UT ->
Telescope 250mm f4.8 Newtonian
Camera Atik 460EX @-15C
Exposure(s) 10x300s each Ha, OIII
Capture APT
Processing APP, Photoshop