Hi David. I'm learning about DSS, and, when I'm able to do images longer than a minute, spend more time working on it. The first time I tried stacking 5 x 40 second images, it came out greeny\bluey, and it took a while to work out the colour. But I then found out that you can stack the images to collect as much data then process the colours, brightness, etc, on say MSN Photo Gallery.
This is an early image of Carina using a Nikon D7000 on a 10 inch reflector taken from Heathcote.
Cheers!