[vanwonky (Dave)]

Originally Posted by MrB

Found it!
It's on the DSS (Deep Sky Stacker) website:
http://deepskystacker.free.fr/english/theory.htm

Thanks Simon. That is a good read and the roll-over image examples are a great way to see the process.

"This is the reason why you should use as many dark/bias/flat frames as possible. On the practical side, 20 frames is a minimum if you want to not add too much noise, and 50 to 100 will give you really nice and (almost) noise free masters.."

100! That is quite some investment in time there after your subs. Might have to try it one week

Cheers
Dave