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I have a feathertouch 10:1 on the C9.25 - works great!
For the C11 I fitted a SW motor via a small timing belt to the existing knob - now I can control the focus either from a handcontroller or via USB.
BTW the image "slop" during reverse focusing at f10 is less than 4 pixels!
Also, the CFZ ( depth of focus) for 1/4 wave accuracy on a f10 system is 0.22mm (220 micron) - this should easily be obtained with any focuser.....
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