This JMI Motofocus electric focuser is designed for use with all MeadeCassegrain telescopes (except ETX models and 16" scopes) that have a somewhat hexagonal focusing knob (six sides, three flat and three curved) that is 0.975" in diameter. See the feature image to confirm this is the shape of the focusing knob on your scope. If your scope has a round focusing knob 0.865" in diameter, this is not the correct focuser. Orderthe #2405 round knob focuser instead.
The focuser consists of a plastic replacement focus knob, a plasticfocus collar, a variable speed DC motor, a hand control, and allnecessary mounting hardware.
The telescope focus knob is removed using the supplied Allen wrench andthe supplied JMI plastic focus knob is installed in its place. The focuscollar attaches in minutes to the rear cell of the telescope, aroundthe new focus knob, using a supplied Allen wrench. The push-on DC motorslips over the focus collar. The motor has electromagnetic braking forvery precise focus control. A rubber O-ring inside the motor provides asecure grip on the focus knob centered within the focus collar. TheO-ring gripping the focus knob acts as a slip clutch to prevent damageif the normal telescope focuser travel is exceeded. The motor is held inplace on the focus collar by a nylon thumbscrew in the motor housing.The motor can be easily removed for traveling or storage. The telescopefocuser can still be used manually if the electric focus motor isremoved from the focus collar, which can be done in only 10-15 seconds.
The cable permanently attached to the motor plugs into the supplied handcontrol. The hand control holds a 9-volt battery (supplied) that willpower the focuser for 6 to 8 months of normal use. Pushbuttons control the direction of focuser travel, while a slide switch changes the focus speed from standard to ultra-fine. In addition, if a major focus change is needed, holding down either directional focus pushbutton for more than two seconds will switch the motor into a very high speed mode for gross focus changes until the push button is released. The motor reverts to its fine-focusing speed the next time the pushbutton is depressed.
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