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Thanks all. Yep still using the Sampson mount, a great mount for its day and the plastic drive wheel still tracks reasonably well with slow correctable periodic error, but sadly the old synchronous motor and manual slow motion dec means autoguiding is not possible. The off axis guider means flexure isnt an issue so I can go for 15 minute subs and surprisingly the old un cooled 350D still doesn't have too much thermal noise after 15 minutes.
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