The rigel one says it will work with GSO crayford focusers, like the ones on the Meade Lightbridge (specifcally mentioned). I am guessing it maybe better to buy a GSO Crayford and then add the Nfocus from Rigel. But a cheaper upgrade for my current system would be to just get the Orion AccuFocus + helical adapter and upgrade to a crayford later.
Regards
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