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a couple of things come to mind
1. a larger mount might help, find out what the load capacity of the cg5 is , usually for astrophotography its better to be on the safer side, what will pass for visual may not for imaging.
2. try using a focal reducer
3. most mounts are no good without guiding, you might get away with a paramount but not many can do it
4. the guiding is for compensating the periodic error
5. there are methods for imaging the periodic error, phd can also log the corrections which will give you an idea of what is happening
6. Maximum exposure time varies with mount and scope, a longer focal length shows more error and is less forgiving, a higher quality mount has less error. its a bit vague i know but you could aim for 3 min exposures for globs and 5 plus for other stuff.
7.ive noticed on this forum most beginners start imaging with an ed80 and then move up from there, long focal length is challenging i do 1500mm and generally cant go past 6 min subs. theres ways to do longer but most solutions come with a price tag.
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