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Thanks 1ponders - that's clearing thing up for me. I must admit the short scope for a big focal length did suggest to the physics kid in me some degradation was inevitable.
Price wise I think the Celestron 127mm is around $220 or so. I'd extend the 8" Dobsonian for ~ $300 if you guys reckon its much better. Am I right in saying the Dobs mount (I laughed when I saw it compared to a lazy susan in the guide on this site!) and it's non-interefered with focal length are the selling points?
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