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Most photos I see arent at 2.5m focal length. Sure you need good tracking at that focal length and a G11 would deliver - even then though perhaps it might be pretty tricky I would have thought (what scope and f ratio by the way - would that be getting heavy for even a G11??).
For what its worth Ive seen some great photos with Eq6s and VC200Ls (1.8m focal length).
Adding an autoguider to a Eq6 will have a big impact on a Eq6s performance still at a much lesser cost than a G11 which may suit some people. Have a friend who tells me his Eq6 pro has quite gradual changes in periodic error and autoguides well. If my scope were just an ED80 I would find it hard to justify the cost of a G11.
Personal views only.
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