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June 24th: Store is closed for Quebec National Holiday. Orders placed that day will ship on June 25th.
ZWO EAF Bracket for Celestron C8/C9.25
ZWO EAF Bracket for Celestron C8/C9.25

ZWO EAF Bracket for Celestron C8/C9.25

by ZWO
SKU ZWO-EAF-C8-C925
$39.00 - $39.00
$39.00
$39.00 - $39.00
$39.00
Price Match Policy!
  • Connects a ZWO EAF to Celestron 8" and 9.25" SCT, EdgeHD, and RASA OTAs
  • Enables precise, automated focusing for astrophotography
  • Includes both 5 mm and 4 mm flexible couplings for broad EAF model compatibility
  • CNC-machined aluminum for a secure, lightweight fit
  • All necessary M4 and M3 mounting hardware is included
3 in stock
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • ZWO EAF Bracket for Celestron C8 and C9.25

    This ZWO EAF Bracket enables precise, automated focusing on your Celestron C8 or C9.25 telescope by providing a rigid mounting point for a ZWO electronic focuser. The kit includes both a 5 mm and a 4 mm flexible coupling to connect to various EAF models. All necessary hardware, including two M4-8mm and three M3-14mm screws, is supplied for a direct, secure installation.

    Automated Focusing for 8" and 9.25" Celestron OTAs

    This bracket replaces the manual focus knob on Celestron 8" and 9.25" Schmidt-Cassegrain, EdgeHD, and RASA optical tubes, allowing direct control with a ZWO EAF (sold separately). By automating focus, you eliminate the image shift and vibrations inherent in manual adjustment, achieving repeatable, critical focus for high-resolution imaging. This is a dedicated solution; once installed, focusing is handled electronically via the EAF.

    CNC Machined Bracket with 4mm & 5mm Couplings

    The bracket is CNC machined from a solid block of aircraft-grade aluminum, ensuring a perfect fit and rigid connection that won't flex or slip during a session. ZWO includes two different flexible shaft couplings to ensure compatibility across their EAF lineup. The 5 mm coupling fits the standard EAF-5V, while the 4 mm coupling is for the newer EAFN and EAF Pro models.

    Direct Installation with Included M3 & M4 Hardware

    Installation is straightforward, completely bypassing the telescope's original focuser mechanism for a direct-drive connection. The kit contains all the required fasteners for the job. The three M3-14mm screws secure the bracket to the telescope's rear cell, and the two M4-8mm screws mount the EAF motor body to the bracket itself.

  • Which ZWO EAF models are compatible with the Celestron C8/C9.25 bracket?

    This bracket is compatible with all ZWO EAF models. It includes two separate couplings to ensure a proper fit: the 5 mm coupling for the standard ZWO EAF (5V version) and the 4 mm coupling for the ZWO EAFN and EAF Pro models.

    Will this ZWO EAF bracket fit my older Celestron C8 from the 1990s?

    This bracket is designed for modern Celestron SCT, EdgeHD, and RASA models manufactured from the mid-2000s onward. It is not compatible with older models that may have a different rear cell or focuser assembly design. Please verify your telescope's manufacturing date before purchasing.

    Can I still use the manual focus knob after installing the ZWO EAF bracket?

    No. Installing this bracket requires the removal of the telescope's original manual focus knob. The EAF motor connects directly to the focusing shaft, so all focus adjustments must be made electronically through the EAF controller or software.

    Does installing the ZWO EAF bracket on my RASA 8 require permanent modifications?

    No, the installation is fully reversible. The bracket attaches using existing screw holes on the RASA 8's rear cell after you remove the stock focuser knob. No drilling or other permanent modifications are required, and you can restore the telescope to its original configuration at any time.

    I have a Celestron EdgeHD 8" and want to automate focus for imaging Jupiter. Is this the right part?

    Yes, this is the correct bracket to mount a ZWO EAF onto your EdgeHD 8". Automating focus is critical for planetary imaging, as it allows you to make tiny, precise adjustments without touching the telescope, ensuring you capture the sharpest possible details on Jupiter's cloud bands during moments of good seeing.

    What is the purpose of the two different couplings included with the bracket?

    The two couplings accommodate different EAF motor shaft diameters. ZWO has used different shaft sizes across its EAF generations. The included 5 mm and 4 mm couplings ensure that you can connect your bracket to any version of the ZWO EAF, whether it's an older standard model or a new Pro version.

  • SKU ZWO-EAF-C8-C925
    Warranty 2 Years
    Compatibility Celestron 8" & 9.25" SCT, EdgeHD, RASA (mid-2000s or later)

    • Motor Bracket

      × 1

    • Flexible Coupling (5 mm)

      × 1

    • Flexible Coupling (4 mm)

      × 1

    • M4-8mm Screws

      × 2

    • M3-14mm Screws

      × 3

  • ZWO 2-Year Limited Warranty