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OK Twiggy. What you have to remember is that both a go to dob and the 8SE are alt az mounted. That means that although they can track an object, they will still not be able to get around field rotation.
These scopes are designed primarily for visual use, which also means the tracking is adequate for that but not super precise.
All that means that only short exposures are possible, which is OK for bright objects (Moon, Jupiter etc) but no good for DSOs
So if I was going to choose I would say get neither, you will probably end up frustrated.
For astro imaging, especially DSOs you need to investigate an equatorial mount, and as a rule get the best one you can afford.
Malcolm
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