Thanks guys, will play with raw and see what happens. I still don't see why there's so much noise from the stacked pair, especially when noise in the individual images is far less. I'll put it down to my lack of understanding and knowledge on astro imaging ;-)
I only tried a bit of imaging last night because a mate who'd come over said 'go on give it a go'. Since I've had problems with the focuser on the Equinox, I've really lost a lot of the interest that I had in imaging initially. I was pretty happy to be able to focus last night, nay, I was REALLY happy. I'm limited to ten seconds it seems, 15 seconds results in elongated stars due to poor alignment.
Next time I get the scope out, I'm going to give it a try again.
Dave
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