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I have the same scope. Mine is complete with original mount and is a Powerstar 4. I am sure there were other version which were very similar on other mount version of the scope, the Ultima , the Polaris etc.
I use a Celestron issued version of the JMI motofocus which is simply a DC motor and tube backer which slips over the focusser assembly and plugs into the mount handset. Works fine and 8 am not really worried about minor image shift.There is a version which has its own controller from JMI and it can also plug into a Shoestring USB focus controller which I have but don’t really use.
They also made a zero shift SCT model for the visual back but more expensive and complex.
You can buy the Celestron Motofocus second hand but it will cost $100US and then you need to get the right model for the eight inch size focus shaft.
You can PM me or post if you want photos of mine.
Cheers
Ray
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