[graham.hobart (Graham stevens)]

from memory only one single 300sec sub in B was bin 1x1 but I will check. I wonder whether the B is just too dominant to stack as a 1/1/0.8 ratio so I might try with lum then different number s of rgb frames.
It was a QSI 683 camera and astronomik filters.
The lum frames are all good SNR.
Cheers
Graham