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I have, I installed a Robofocus motor and controller to the 4" focuser straight after I received the scope. It is easily the best addition you can make to any scope IMHO. With such a small critical focus zone on my Tak FSQ106ED it is almost a pre requisite and should come from the factory with a digital focuser fitted. The other problem with the FSQ is the focus change with temperature and the Robofocus used with either Focus Max or MaximDL focus routine for temp compensation can easily save an image from the recycle bin.
I wouldn't be without it.
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