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Celestron Focus Motor A for SCT and EdgeHD Telescopes

SKU : CE-94155-A

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  • Enables electronic focusing. 
  • Self-powering.
  • Compatible with most Celestron Schmidt-Cassegrain, EdgeHD, and Rowe-Ackermann Schmidt Astrograph optical tubes.
  • Motor controls include multiple speed rates, automatic GoTo indexed focuser position, and focuser backlash compensation.
  • Focuser Utility software.
  • Enables auto-focusing with a camera and third-party software via ASCOM.
  • Indexed focus position.


Product Details

  • This Focus Motor is designed for Celestron Schmidt-Cassegrain (SCT) and EdgeHD telescope optical tube assemblies.

    When this focus motor is installed, you will be able to bring celestial objects into sharp, precise focus using your telescope's hand controller or a computer instead of using the focuser knob.

    A focus motor is great for visual observers who want to dial in exact focus (especially those with dexterity issues), and a must-have accessory for astro-imagers. With a motorized focuser installed, an astro-imager no longer needs to be physically near the telescope to focus an image. Combined with computerized control of the mount and camera, the focus motor enables the imager to gather data remotely from a telescope right outdoors or one located in a remote observatory where they have control.

    As an added bonus, port covers protect the ports while they are not in use, and the covers cannot be lost due to a tethered design.

    Compatible Optical TubesCelestron Focus Motor -for SCT and EdgeHD Telescopes-BACK

    The focus motor is compatible with:
    • SCTs from 6-inch to 14-inch in aperture that have been produced since the year 2006.
    • 8-inch Rowe-Ackermann Schmidt Astrograph (RASA).
    • 36 cm RASA.
    • 7-inch Maksutov-Cassegrain.
    • All of the EdgeHD optical tubes (Now including the 9.25-inch).
    • 11-inch RASA - but requires the Focuser Retrofit Kit.   

     It is not compatible with:

    • 5-inch SCTs or older models.
    • For 6-inch Schmidt-Cassegrain telescopes only - the Off-Axis Guider (#93648) cannot be used when the focus motor is installed due to mechanical interferences.


    Power Options

    There are three options for powering your Celestron Focus Motor:
    • When using a Celestron computerized mount, you can power and control the focus motor through the mount using the supplied AUX cable. This allows control from the mount’s hand controller (NexStar+ or StarSense) or a computer.
    • If you are not using a Celestron mount, you can power and control the focus motor from a computer USB port. You will need a user-supplied USB A-to-B cable.
    • You may also opt to use an external 12V DC power source which plugs into the motor’s power jack. Compatible Software Celestron offers a free Focuser Utility program for computer control. The Celestron PWI software can also control the focus motor. To use third-party focuser control software, an ASCOM driver is needed.


  • specifications

    AUX Port PowerCelestron computerized mount AUX port/ connecting cable supplied
    CD Jack Power12V DC 1A/ 5.5mm/ 2.1 mm tip positive plug
    Focuser ShaftCoupler/ Aluminum clamping sleeve
    Focuser Steps per Revolution1000 steps
    Free ShippingYes
    Gear Diameter35.2mm
    Gear Ratio1:1
    Gear Teeth42
    Gear TypeSpur/ Brass
    MicroprocessorNXP Kinetics serice/ Arm coretex~M4 core
    Motor Speed Rates8/32/ and 128 degrees per second
    Motor TypeDC servo motor
    USB Port PowerUSB3 or USB2 with at lease 900 mA
    Weight15 ounces (0.42 kg)
  • included items

    .Celestron Focus Motor -for SCT and EdgeHD Telescopes-8-INCLUDED 

    • Motor:  DC servo motor.
    • Spur gears:  Brass, 1:1 gear ratio, 35.2 mm diameter, 42 teeth.
    • Focuser shaft coupler:  Aluminum clamping sleeve.
    • Microprocessor:  NXP Kinetis series, Arm Coretex-M4 core.
    • AUX port power:  Powered by Celestron computerized mount AUX port, connecting cable supplied.
    • USB port power:  USB3 or USB2 providing at least 900 mA.
    • DC jack power:  12V DC, 1A, 5.5 mm/ 2.1 mm tip positive plug.


Product Reviews

Customer Reviews
4.8 Based on 10 Reviews
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United States United States

Great service, great product

So far, so good. Will need more time to fully tryout

United States United States

Celestron Focus Motor - Rasa 8

Installation is straightforward for the Rasa 8. The instructions are clear. Calibration using an Ascom user interface leads you to hav to enter a backlash figure and the suggested number (50 or so) is way too high. Using the CPWI (I have my Rasa mounted on an AVX), makes it a breeze and calibration went on smoothly with no issue, and CPWI figured out the backlash on its own (I have no idea what it is, nor does it seem to matter). I use NINA to image and autofocus worked like a charm using CPWI as the ascom connection. Overall, quite happy with this focuser.

United States United States

focus motor does its job

On a C-14 SCT it works fine. Handblock has to have the latest firmware. My only issue is that when in focus mode, the slow motions don't work.Since it is moving the mirror, the star moves in the field and you can't bring it back without going oout of focus mode. A minor inconvenience. OPT as always delivered in a timely fashion.

A OPT Telescopes Customer
Michael W.
United States United States

Fine focusing experience

Allowed me to get a precise focus without causing the scope to shake. Very well made!!

OPT Telescopes Celestron Focus Motor A for SCT and EdgeHD Telescopes Review
Jeff P.
United States United States

A nice addon

I put this on my Nexstar 6SE. Fairly easy to install. I got it the first time. Fairly quiet. The real benefit is using it on a Celestron mount which supplies the power and a hand control for focusing manually if you do not want to be tied to a PC. In stock and prompt shipping from OPT!

Matthew H.
United States United States

Perfect for Celestron SCT

Now that celestron has modified the design slightly, it actually fits on my 9.25 edge. The original was a couple MM too large and had to be sent back. This is a solid and verges to install focus motor and works fine with Ascom drivers or their own software. Installation was under 5 minutes, msot of which was just reading the instructions. If you own a Celestron SCT, this is a solid and affordable focuser.