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I am imaging with the MN190 and the stock focuser has an unique internal 2" extension tube which slides out of the focuser, the locking arrangement of the extension was a single screw and there was some slop in the extension system. The stock focuser while adequate stuggled with a combined filter wheel and camera setup, it also lacked a locking system other than cranking up the tension adjustment. The stock focuser is fine for visual use and light imaging gear.
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