Hi Guys
Starless Nebula NGC6188 in narrowband (click for big)..Mapped as Ha SII Ha OIII (LRGB)
Taken on an RCOS 10" RC Scope at f9, SBIG STXL6303E Camera and PME mount at itelescopes Siding Spring Observatory.
22hrs of 3nm Ha 9hrs of OIII bin2 and 6 hrs of SII bin2.
Processed with CCDstack, Star Tools and Photoshop.
Ha 40min subs, OIII, SII 20min subs.