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i used the JMI Motofocus/PC focus with a GSO 10:1 and i was suprised how well it worked for a cheap setup.
its not going to give you instant repeatable focus to the same spot for each filter like the expensive ones but if you focus by numbers it takes no time anyway. i actually miss it since i started using the Tak instead of my 6" newt
the GSO 10:1 can be a bit smoother if you re-grease it but its not really needed if using the motofocus, that doesnt really care how smooth or not the focusser is aslong as its not really bad.
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