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The comments are very useful guys.
I had thought about going to a crayford with 10:1, but you can't motorise them easily, unless you are paying big bucks. I am interested in the JMI, but it'll cost me $640, and I won't get away with that sort of expenditure at the moment!
The main reason was to make focusing easier when using the web cam. Not really at the point where autofocus is a requirement yet, but playing with the focus manually is a pain. I have an EQ6 mount, but avoiding manual touching has to improve things all-round.
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