This JMI Motofocus electric focuser is designed for use with classic black and orange tube Celestron 11” Schmidt-Cassegrain telescopes only. A full list of telescopes this focuser will work with is at the bottom of this copy.
The focuser consists of a plastic replacement focusing knob, a plastic focusing collar, DC motor, hand control, and all necessary mounting hardware.
The telescope focusing knob is removed using the supplied Allen wrench and the supplied plastic focusing knob is installed in its place. The exposed shaft that the new knob fits on measures 19mm (0.748") in diameter. Do not order this focuser if your focuser shaft is larger than this measurement. Order the appropriate other C11 focuser as determined by the diameter of the focuser shaft that you measure (#2411NEX if the shaft measures 22.8mm (0.898") in diameter and #241CPC1 if the shaft measures 21.8mm (0.858") in diameter. The focusing collar attaches in minutes to the rear cell of the telescope, around the new focusing knob, using a supplied Allen wrench. The push-on DC motor slips over the focusing collar. A rubber O-ring inside the motor provides a secure grip on the focusing knob that is centered within the focusing collar. The motor is held in place on the focusing collar by a nylon thumbscrew in the motor housing. The motor can be easily removed for traveling or storage. The motor has electromagnetic braking for very precise control. The O-ring gripping the focusing knob acts as a slip clutch to prevent damage if the normal telescope focuser travel is exceeded. The telescope focuser can still be used manually if the electric focus motor is removed from the focusing collar, which can be done in only 10-15 seconds.
A small hand control box plugs into the coiled cord permanently attached to the push-on motor. The control box holds a 9-volt battery (supplied) that will power the focuser for 6 to 8 months of normal use. Pushbuttons control the direction of focuser travel, while a variable speed control adjusts the focusing speed.
Celestron telescopes this focuser will work with:
fork mount C11 and Ultima 11
German equatorial mount CG-11 (using the Losmandy G-11 mount); and
German equatorial mount CM-1100 (using the Celestron CI-700 mount).
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