This JMI Motofocus electric focuser is designed for use with the 11” Celestron CPC1100 Schmidt-Cassegrain. These scopes have an orange ring around the base of the focus knob. To be certain if this is the correct The focuser consists of a plastic replacement focusing knob, a plastic focusing collar, DC focus motor, hand control, and all necessary mounting hardware.
A coiled cord permanently attached to the focus motor plugs into small hand control box. The control box holds a 9-volt battery (supplied) that powers the focuser for 6 to 8 months of normal use. Pushbuttons on the box control the direction of focuser travel, while a 3-position slide switch adjusts the focusing speed. When the slide switch is set for either the fine focus or ultrafine focus speeds, holding down either pushbutton for a few seconds will cause the motor to speed up to the fast focusing rate for as long as the pushbutton is kept depressed. This allows you to quickly make major focus changes without having to reset the focusing speed slide switch.
To install the focuser, the telescope focusing knob is removed using the supplied Allen wrench and the supplied plastic focusing knob is mounted in its place. The exposed shaft that the new knob fits on measures 21.8mm (0.858") 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 #2411 if the shaft measures 19mm (0.748") 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 focusing collar attaches in minutes to the rear cell of the telescope around the new focusing knob, using a small Phillips head screwdriver, not supplied. The push-on DC motor slips over the focusing collar. A rubber O-ring inside the motor securely grips the focusing knob that is centered within the focusing collar. The motor is held firmly in place on the focusing collar by a nylon thumbscrew in the motor housing, so that pushing the buttons on the hand control causes the motor to turn the telescope focusing knob, rather than simply spinning the focus motor uselessly on the collar.
The motor can be easily removed for traveling or storage. 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. 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.
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