This JMI Motofocus electric focuser is designed for use with all Celestron telescopes using the Celestron 9¼” optical tube. These include the C9¼S Advanced Series, the C9¼S-GT Advanced Series go-to, the CGE925 go-to equatorial, and the discontinued Celestron German equatorial mount CG-9¼ and fork mount NexStar 9¼ and Ultima 9¼. 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 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.
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