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davidgate, i can vouch for the Orion Accufocus about 90$ from Bintel. Though my first one had some issues, it was promptly replaced no fuss for one that works quiet well. You can read many reports about it on the cloudynights forums (US based). Most people seem to have commented positively about it. Considering that alternative commericial options are 3 times the price and more this is a very affordable option and its well recived by the community.
Regards
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