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I think your on a path to gold at the moment Dan,
If your thinking though to do photography though your guide refractor, go the ED yes it is expensive, but you will not regret the purchase.
Im not sure about the toucam, but it has been used for some great results on the planets, have you thought about a imaging sorce DMK one shot colour or bw?
I know a cannon Dslr 350 can achieve prime focus with the 1.25" - 2" adaptor with the 1.25" adaptor unscrewed with plenty of travel, im not sure of the Nikkon Dslr thread but im sure you can get something.
just have a look on the net for what thred it uses and if it is compatable. The reason why most people upgrade there focusers is due to 2 reasons, to get more in travel without shortening the Optical Tube, and to get better stability/focus. Ive seen the SW Crayford style work well!
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