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Improving DSS scores and how many stars needed to stack
I am having mixed results so far. For some objects, I can stack no problems. Heaps of stars, scores in the 1000s, etc... but when I turn my attention to a galaxy... I can see the galaxy fine when imaging off a 30 second exposure. I then take dozens of 30 second images. They are a few brightish stars in the FOV. I then go to stack in DSS and get only 3 or 4 stars per image and scores of 100-150. Hence, it won't stack more than one light. Do I simply need to expose for longer? My set up has a long focal length (2350mm) and lots of flex in the guide scope, so I am having trouble with long exposures.
What length of exposure do most people find is ideal to balance being in town, with low-medium budget equipment, no permanent mount and being able to stack ok - when it comes to galaxies?
Pity, since the object (NGC 3166) had potential when you view just a single 30 sec exposure...
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