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Hi Peter
Well, if you have tracking problems at 10 secs, you really MUST polar align better 1st. Whilst polar aligning, aim for 5mins without the star moving too much. You really need to do this 1st. Guiding will help, but good polar align is a critical 1st step. Then, with only tracking, you can take reasonable 30 sec subs (actually, you could go longer with the short FL ED80/DSLR combo). Very quickly after that, you will need to add guiding to get typical 5 min killer exposures.
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