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Starlight Instruments 2.0" Adapter Rack/Pinion for Celestron & Meade Small Thread SCT Telescopes
Starlight Instruments 2.0" Adapter Rack/Pinion for Celestron & Meade Small Thread SCT Telescopes

Starlight Instruments 2.0" Adapter Rack/Pinion for Celestron & Meade Small Thread SCT Telescopes

by Starlight Instruments
SKU SI-A20-3003-7
CA$182.00 - CA$182.00
CA$182.00
CA$182.00 - CA$182.00
CA$182.00
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  • Connects 2.0" Rack/Pinion Feather Touch Focusers to select SCTs
  • Compatible with Celestron C8, CPC8, C9.25, and CPC9.25 telescopes
  • Compatible with Meade 8" SCT telescopes
  • Provides a rigid, thread-on connection for heavy imaging loads
  • Enables precise, shift-free external focusing
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  • Description
  • FAQ
  • Warranty

  • Starlight Instruments 2.0" Adapter for Celestron & Meade SCTs

    This Starlight Instruments adapter provides the specific mounting thread needed to upgrade your Celestron C8, CPC8, C9.25, CPC9.25, or Meade 8" SCT with a 2.0" Feather Touch Rack-and-Pinion Focuser, enabling a new level of focusing accuracy for your telescope.

    Eliminate Image Shift on Your C8 or C9.25 SCT

    The primary reason to upgrade a Schmidt-Cassegrain telescope with an external focuser is to eliminate the inherent image shift, or "mirror flop," caused by the stock focusing mechanism. This adapter allows you to attach a high-precision Feather Touch focuser, bypassing the mirror-focusing system entirely. After achieving rough focus with the original knob and locking the mirror, all subsequent adjustments are made with the external focuser, ensuring your target remains perfectly centered during critical focusing for high-resolution imaging.

    A Solid Foundation for 2.0-inch Rack-and-Pinion Focusers

    Designed exclusively for the robust 2.0" Rack-and-Pinion Feather Touch Focuser, this adapter creates a secure, non-flexing connection to your telescope's rear cell. The rack-and-pinion design is essential for handling heavier imaging trains that include CCD or CMOS cameras, filter wheels, and off-axis guiders. This adapter ensures that the focuser is perfectly aligned and capable of supporting substantial weight without slippage.

    • Celestron Compatibility: C8, CPC8, C9.25, CPC9.25
    • Meade Compatibility: 8" SCT Models
    • Focuser Fit: Starlight Instruments 2.0" Rack-and-Pinion Feather Touch Focuser

  • What is the main benefit of using this Starlight Instruments adapter on my Celestron C8?

    This adapter allows you to install a 2.0" Feather Touch Rack-and-Pinion focuser, which completely bypasses the telescope's internal mirror-focusing mechanism. This eliminates the "image shift" common with stock SCT focusers, providing a stable platform for high-magnification focusing.

    Will this adapter fit the Crayford version of the 2.0" Feather Touch focuser?

    No, this adapter is specifically machined for the 2.0" Rack-and-Pinion Feather Touch Focuser. Starlight Instruments manufactures different adapters for their Crayford-style focusers to ensure a perfect fit.

    Which specific Celestron and Meade telescopes is this 2.0" Rack/Pinion adapter compatible with?

    This adapter is designed to thread onto the rear cell of the following telescopes:

    • Celestron C8 and CPC8
    • Celestron C9.25 and CPC9.25
    • Meade 8" SCT models

    Why would I choose a rack-and-pinion focuser for my C9.25 instead of a Crayford?

    A rack-and-pinion focuser, like the one this adapter supports, is built to handle heavier loads. If your imaging train includes a large camera, filter wheel, and off-axis guider, the rack-and-pinion design prevents slippage and flexure, ensuring your focus remains locked even when the telescope is aimed high in the sky.

    Do I still use the original focus knob on my Meade 8" SCT after installing this adapter and a Feather Touch focuser?

    No. The standard procedure is to use the original knob to achieve rough focus once, then lock the primary mirror in place (if your scope has mirror locks). From that point on, all fine focusing is done with the external Feather Touch focuser. This adapter is the key component that enables that precise, external control.

    Is installation of this Starlight Instruments adapter difficult?

    Installation is straightforward for this Starlight Instruments adapter. It simply threads onto the rear cell of your compatible SCT. The Feather Touch focuser then attaches securely to the adapter. Always ensure threads are clean and not cross-threaded during installation to guarantee a solid connection.

  • Starlight Instruments 2-Year Warranty