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I have one of the Celestron focusers on my C9.25 for photographic work and it is a godsend. I am not sure if they would be as useful for visual work but anything that keeps you from having to touch the tube is a good thing. The only thing it is missing is a temperature sensor.
For manual focus or automated, you always want the final focus move to have the mirror going up the tube against gravity, as Dunk mentioned.
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