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IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
Starlight Instruments 3.0" Adapter for Celestron C11/C14 SCT Telescopes
Starlight Instruments 3.0" Adapter for Celestron C11/C14 SCT Telescopes

Starlight Instruments 3.0" Adapter for Celestron C11/C14 SCT Telescopes

by Starlight Instruments
SKU SI-A30-1903-7
$250.00 - $250.00
$250.00
$250.00 - $250.00
$250.00
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  • Connects Starlight Instruments 3.0" focusers to Celestron C11 and C14 SCTs
  • Threads directly onto the telescope's 3.29" x 16 TPI rear cell
  • Provides a rigid, non-flexing connection for heavy imaging trains
  • Machined for a precise fit to eliminate image shift
  • Total adapter length of 2.335"
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • Starlight Instruments 3.0" Adapter for Celestron C11/C14 SCT Telescopes

    This Starlight Instruments 3.0" Adapter is the essential component for upgrading your Celestron C11 or C14 SCT with a high-precision Feather Touch focuser. It directly connects a 3.0" format focuser to the large 3.29" x 16 TPI female thread on the rear cell of the C11 and C14 optical tubes. With a total length of 2.335", this adapter provides the correct spacing and a rigid, zero-flex connection required for serious astrophotography.

    Securely Mount a 3.0" Focuser to a C11/C14's 3.29" Thread

    By replacing the standard visual back, this adapter lets you bypass the telescope's internal focusing mechanism entirely, eliminating the primary source of image shift and mirror flop inherent in SCT designs. The robust, all-metal construction ensures that even heavy imaging trains—including a large format camera, filter wheel, and off-axis guider—are held securely without any tilt or sag. This direct-thread connection is critical for maintaining sharp, consistent focus across long exposures and automated imaging sessions.

  • What is the primary purpose of the Starlight Instruments 3.0" adapter for C11/C14 telescopes?

    This adapter allows you to securely attach a Starlight Instruments 3.0" Feather Touch focuser to the rear cell of a Celestron C11 or C14 Schmidt-Cassegrain telescope. It creates a solid, threaded connection, replacing the stock visual back and enabling the use of a high-precision external focuser.

    Why should I upgrade my Celestron C14 with this adapter and a Feather Touch focuser?

    The primary benefit is the elimination of image shift and mirror flop caused by the telescope's internal focusing mechanism. For astrophotography, especially with heavy equipment, an external Feather Touch focuser provides vastly superior precision, stability, and load-bearing capacity, resulting in sharper images and reliable automated focusing.

    Is this 3.0" adapter compatible with a Celestron C8 or C9.25 SCT?

    No. This adapter is specifically designed for the large 3.29" x 16 TPI thread found only on Celestron C11 and C14 models. The C8 and C9.25 telescopes use a smaller, standard 2" SCT thread and require a different adapter.

    How does this Starlight Instruments adapter attach to the telescope?

    The adapter has a 3.29" x 16 TPI female thread that screws directly onto the male thread of your C11 or C14's rear cell. The other end of the adapter provides the correct interface for attaching a Starlight Instruments 3.0" focuser body, which is then secured via its own locking mechanism.

    Can I use this adapter with a 3.0" focuser from a different brand?

    This adapter is designed specifically for the mounting pattern and mechanical interface of Starlight Instruments 3.0" Feather Touch focusers. Compatibility with other brands is not guaranteed and may require additional custom adapters.

    I image deep-sky objects like the Leo Triplet (M66 Group) with my C11. How does this adapter help?

    When imaging faint targets like the Leo Triplet, maintaining perfect focus through temperature changes and long exposures is critical. By enabling a rigid, external focuser, this adapter ensures your focus point does not shift due to mirror movement. This allows automated focusing routines to work flawlessly, keeping your stars tight and your details sharp throughout the night.

  • Product Type Telescope Tube Adapter
    Compatibility Celestron C11 and C14 SCT Telescopes
    Focuser Interface Starlight Instruments 3.0" Feather Touch Focusers
    Telescope Thread 3.29" x 16 TPI Female
    Adapter Length 2.335"

    • 3.0" Adapter for Celestron C11/C14 SCT Telescopes

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  • Starlight Instruments 2-Year Warranty