[g__day (Matthew)]

So lets say I had planned to image a Nebula in LRGB for a total of 24 hours - how much time would folk suggest I allocate to each filter for a non broadband target - are there any rules of thumb - like 40% of time allocate to Luminance data and 20% to each of Red, Green and Blue?

Secondly if one where planning to get say 10 hours of Luminance data - would you go for all the same image duration or split it into something like

1 hour of 60 second shots
2 hours of 120 second shots
3 hours of 180 second shots
4 hours or 240 second shots (presuming this didn't fill your camera light wells)

And for the RG and B filters do the same - but go for longer duration shots by 30% - 50% duration as filters let less light though?

Many thanks for folks suggestions