the subs for the shown picture was taken in Aug-2015, during several clear nights in the Copenhagen/ Denmark area.
It is composed as a LRGB picture with Ha, OIII, SII subs blended into the R, G, B channels.
Exposure time range was from few sec. up to 300 sec, in total ~11 hours. Equipment used: LX200ACF 16", Atik 460ex mono camera, and Baader filters.
Kind regards Niels