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Pegasus Motor Focus Kit Zero - Celestron SCT, EdgeHD & RASA
Pegasus Motor Focus Kit Zero - Celestron SCT, EdgeHD & RASA

Pegasus Motor Focus Kit Zero - Celestron SCT, EdgeHD & RASA

by Pegasus Astro
SKU PEG-MFKZERO-SCT68925
CA$196.00 - CA$196.00
CA$196.00
CA$196.00 - CA$196.00
CA$196.00
Price Match Policy!
  • Adds automated, zero-backlash focusing to Celestron SCT, EdgeHD, and RASA telescopes
  • Bipolar stepper motor with 1.8° step angle for high-precision adjustments
  • Hold torque 0.8 kg/cm, detent torque 0.18 kg/cm
  • Pulley and belt drive keeps the motor clear of your filter wheel when a focal reducer is used
  • 280 g including the bracket
  • Three versions available with 13 mm or 22 mm pulleys to fit specific telescope models
Compatibility
3 in stock
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  • Description
  • FAQ
  • Specifications
  • In the Box
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  • Warranty

  • Pegasus Motor Focus Kit Zero - Celestron SCT, EdgeHD & RASA

    The Pegasus Motor Focus Kit Zero provides automated, high-precision focusing for Celestron SCT-style telescopes by pairing a zero-backlash bipolar stepper motor with a robust pulley-and-belt drive system. This motor delivers 0.8 kg/cm of holding torque to securely position the primary mirror, moving in 1.8° steps. The whole kit, including the black anodised aluminium bracket, weighs 280 g and is rated for -40 to +80 °C.

    A Motor-Only Kit Requiring a Pegasus Controller

    This is a motor and bracket assembly only; it requires a separate Pegasus Astro motor controller for operation. The included 1 m RJ45 cable connects the Motor Focus Kit Zero to a Pegasus Dual Motor Focus Controller, Ultimate Powerbox v2, or eXternal Motor Controller. Note that the Ultimate Powerbox v1 is not compatible with this motor.

    Zero Backlash & 1.8° Steps for Precise SCT Focusing

    Focusing an SCT involves moving the entire primary mirror, a mechanism prone to image shift and backlash. The Motor Focus Kit Zero eliminates this uncertainty with a bipolar stepper motor that has no gear play, ensuring every command from your software results in exact, repeatable movement. This kit replaces the older, slower Motor Focus Kit SCT, and it is much faster. Pegasus built it for owners who found the old motor slow, and the speed shows during autofocus runs, which move the mirror back and forth many times.

    • Backlash-free drive: the bipolar stepper turns the focus knob through a GT2 timing belt and pulleys, and Pegasus rates the drive as zero backlash. That is what V-curve autofocus needs: small, exact moves in both directions around best focus.
    • Fine steps: the 1.8° step angle, reduced again by the pulley pair, gives your software fine control over the mirror position.

    Belt Drive Keeps the Motor Clear of Your Filter Wheel

    The belt lets the motor sit beside the focus knob instead of on its axis. Pegasus designed it this way so the motor stays away from your filter wheel, and does not collide with it, when you image through a focal reducer. The SCT bracket is the margarita style, made to fit all new Celestron SCTs (Classic and EdgeHD) and the RASA series.

    Choosing Your Version: 13 mm vs. 22 mm Pulleys

    The kit is available in three versions, differentiated by the bore diameter of the large GT2 pulley that fits over your telescope's focuser shaft. Selecting the correct version is critical for a proper fit.

    • PEG-MFKZERO-SCT68925: Includes a 13 mm bore pulley. Fits Celestron Classic & EdgeHD 6", 8", 9.25", and the RASA 8".
    • PEG-MFKZERO-SCT11: Includes a 22 mm bore pulley. Fits Celestron Classic & EdgeHD 11" and the RASA 11" V2. (RASA 11" V1 requires a separate Celestron retrofit kit).
    • PEG-MFKZERO-SCT14: Includes a 22 mm bore pulley. Fits Celestron Classic & EdgeHD 14" and the RASA 14".

    While designed for Celestron, the bracket may also fit some Meade SCTs with a round focus knob. However, compatibility with older SCT models is not guaranteed; the margarita-style bracket is designed for modern Celestron rear cells.

    Bipolar Stepper Motor with 0.8 kg/cm Hold Torque

    Pegasus describes this stepper as having the torque needed to focus an SCT with great precision. The figures: 0.8 kg/cm hold torque while powered and 0.18 kg/cm detent torque, the resistance the motor keeps when unpowered. Enclosure size is 52 x 58 x 35 mm.

  • Which controller do I need for the Pegasus Motor Focus Kit Zero?

    The Motor Focus Kit Zero requires a Pegasus Astro controller. It is fully compatible with the Dual Motor Focus Controller, Ultimate Powerbox v2, and the eXternal Motor Controller. It is not compatible with the original Ultimate Powerbox v1.

    Will the Motor Focus Kit Zero fit my older Celestron C8 from the 1990s?

    Maybe not. Pegasus notes that some older SCT series do not accept the SCT bracket. If you are unsure, send Pegasus (or us) a photo of your focuser before ordering, and we will check it with you.

    Why does the Motor Focus Kit Zero use a belt instead of a direct drive?

    The pulley and timing belt let the motor sit beside the focus knob. Pegasus chose this layout so the motor stays away from your filter wheel, and does not collide with it, when you use a focal reducer.

    What is the difference between the three versions of the Pegasus Motor Focus Kit Zero?

    The versions differ in the bore of the metal pulley and in the length of the screws in the package.

    • 6, 8 and 9.25 in SCTs and RASA 8: 13 mm bore pulley (PEG-MFKZERO-SCT68925).
    • 11 and 14 in SCTs, RASA 11 V2 and RASA 14: 22 mm bore pulley (PEG-MFKZERO-SCT11 or PEG-MFKZERO-SCT14).

    Pick the kit made for your aperture so both the pulley and the screws fit.

    Is the Motor Focus Kit Zero difficult to install on a Celestron EdgeHD 11?

    Installation is straightforward. You will need to remove the rubber grip from the focuser knob, attach the margarita bracket using the three provided screws, slide the large 22 mm pulley onto the knob's shaft, and then attach the motor assembly. The final step is to slide the motor on its bracket to apply light tension to the belt before tightening the final screws.

    Why is a "zero backlash" motor important for focusing my SCT?

    SCTs focus by moving the primary mirror, so every focus move should be as repeatable as possible. Autofocus routines step through focus in both directions and fit a curve to the star sizes. A motor and belt drive with zero backlash adds no play of its own, so the positions your software commands are the positions it gets.

    Can I use the Ultimate Powerbox v1 with the Motor Focus Kit Zero?

    No. The Motor Focus Kit Zero is explicitly not compatible with the original Ultimate Powerbox (v1). You must use an Ultimate Powerbox v2 or another compatible Pegasus controller like the Dual Motor Focus Controller or eXternal Motor Controller.

    Will this kit fit my Meade SCT?

    It might. While the bracket was designed for Celestron telescopes, it has been observed to fit some Meade SCTs that have a similar round focus knob. Compatibility is not guaranteed, so you should compare your Meade's focuser assembly to the product photos before purchasing.

  • Motor Type Bipolar stepper motor, zero backlash
    Step Angle 1.8 deg
    Hold Torque 0.8 kg/cm
    Detent Torque 0.18 kg/cm
    Drive System Pulley and timing belt (GT2 pulley)
    Bracket Material Black anodised aluminium SCT bracket (margarita style)
    Controller Required Dual Motor Focus Controller, Ultimate Powerbox v2, or eXternal Motor Controller
    Incompatible Controllers Ultimate Powerbox v1
    Pulley Bore 13 mm (for 6, 8, 9.25 in models) or 22 mm (for 11, 14 in models)
    Motor Cable RJ45 to RJ45, 1 m length
    Dimensions (Enclosure) 52 x 58 x 35 mm
    Weight (Total) 280 g (including bracket)
    Operating Temperature -40 to +80 °C
    SKU (6/8/9.25") PEG-MFKZERO-SCT68925
    SKU (11") PEG-MFKZERO-SCT11
    SKU (14") PEG-MFKZERO-SCT14

    • Motor Focus Kit Zero

      × 1

    • Black Anodised Aluminium Margarita Bracket

      × 1

    • Timing Belt

      × 1

    • GT2 Pulley (13 mm or 22 mm bore)

      × 1

    • M3x6 mm Screws

      × 4

    • Metric Screws & Plastic Washers

      × 3

    • RJ45 to RJ45 Cable (1 m)

      × 1

  • Pegasus Astro 2-Year Warranty