I have an 8"f6 Dob and a scopetronics setup for my digital camera. I am
able to take 1/30 second shots of say Jupiter and Saturn. Unfortunately I
do not have a guiding system to track so stacking multiple images becomes a
problem.

There are fantastic images taken by others where a 1000 images are stacked
and the detail is incredible.

I have tried to stack multiples of the same image with little luck in
obtaining anything but an over exposed image. A couple of image stacks may
bring out some detail. I understand that multiple images can reduce
background noise and grabbing a group of saved images during a window of
great seeing can also help.

For me to try stacking do I set the shutter speed to say 1/250 sec and
although the image, when dumped to the computer, is very faint would I then
stack 100 copies to grab the detail and increase the brightness?

Not sure if I have worded my question correctly but I am hoping someone will
know what I mean.

Regards
Brian