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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.
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 2.0" Adapter for Astro-Tech 6", 8" and GSO 6", 8" RC Telescope, WO Newer Megrez 80/90mm and WO GT81 Telescope
Starlight Instruments 2.0" Adapter for Astro-Tech 6", 8" and GSO 6", 8" RC Telescope, WO Newer Megrez 80/90mm and WO GT81 Telescope
Starlight Instruments 2.0" Adapter for Astro-Tech 6", 8" and GSO 6", 8" RC Telescope, WO Newer Megrez 80/90mm and WO GT81 Telescope
Starlight Instruments 2.0" Adapter for Astro-Tech 6", 8" and GSO 6", 8" RC Telescope, WO Newer Megrez 80/90mm and WO GT81 Telescope
Starlight Instruments 2.0" Adapter for Astro-Tech 6", 8" and GSO 6", 8" RC Telescope, WO Newer Megrez 80/90mm and WO GT81 Telescope
Starlight Instruments 2.0" Adapter for Astro-Tech 6", 8" and GSO 6", 8" RC Telescope, WO Newer Megrez 80/90mm and WO GT81 Telescope

Starlight Instruments 2.0" Adapter for Astro-Tech 6", 8" and GSO 6", 8" RC Telescope, WO Newer Megrez 80/90mm and WO GT81 Telescope

by Starlight Instruments
SKU SI-A20-271
$130.00 - $130.00
$130.00
$130.00 - $130.00
$130.00
Price Match Policy!
  • Connects a 2.0" Starlight Instruments Feather Touch Focuser to your telescope
  • Designed for Astro-Tech and GSO 6" and 8" Ritchey-Chrétien telescopes
  • Compatible with William Optics newer Megrez 80/90mm and GT81 refractors
  • Provides a secure, non-flexing mounting point for heavy imaging trains
  • Machined for a precise fit to eliminate image shift and alignment issues
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  • Description
  • FAQ
  • Specifications
  • Downloads
  • Warranty

  • Starlight Instruments 2.0" Adapter for Astro-Tech 6", 8" and GSO 6", 8" RC Telescope, WO Newer Megrez 80/90mm and WO GT81 Telescope

    The Starlight Instruments 2.0" Adapter creates the critical, rock-solid link for upgrading your Astro-Tech 6"/8" RC, GSO 6"/8" RC, William Optics Megrez 80/90mm, or WO GT81 telescope with a high-precision focuser. This component replaces the stock focuser interface, allowing the direct attachment of a 2.0" Feather Touch focuser to unlock sharp, shift-free imaging.

    Upgrade Your RC or Refractor with a 2.0" Feather Touch Focuser

    Many popular telescopes ship with focusers that are adequate for visual use but can introduce flexure or image shift when loaded with a heavy camera, filter wheel, and guide scope. This adapter is the first step in solving that problem, enabling you to install a Starlight Instruments 2.0" Feather Touch focuser—the industry standard for precise, repeatable, and robust focusing.

    By upgrading, you gain the ability to make minute focus adjustments without backlash, essential for capturing sharp stars during astrophotography. The secure connection provided by this purpose-built adapter ensures your entire imaging train remains perfectly orthogonal to the optical axis.

    Direct-Fit for 6" & 8" RC and William Optics GT81 Scopes

    This is not a universal adapter; it is a scope-specific component machined by Starlight Instruments for a perfect match. It features the precise female threading required to mount directly to the rear cell of a specific range of telescopes, ensuring a rigid and secure connection without any intermediate parts that could cause tilt or flex.

    • Astro-Tech Telescopes: 6" and 8" Ritchey-Chrétien (RC) models.
    • GSO Telescopes: 6" and 8" Ritchey-Chrétien (RC) models.
    • William Optics Telescopes: Newer Megrez 80mm, Megrez 90mm, and the GT81 Apochromatic Refractor.

  • What is the purpose of this Starlight Instruments 2.0" adapter?

    This adapter's sole purpose is to allow you to remove the stock focuser from a compatible telescope and replace it with a high-precision 2.0" Starlight Instruments Feather Touch Focuser. It provides the correct mechanical and threaded interface for a secure, direct-fit connection.

    Will this adapter fit my Astro-Tech 8" RC telescope?

    Yes, this adapter is specifically designed to fit the rear cell threads of the Astro-Tech 6" and 8" Ritchey-Chrétien telescopes, as well as the GSO-branded versions of the same models.

    What benefit do I get from using this adapter to install a Feather Touch focuser on my GSO 6" RC?

    Upgrading your GSO 6" RC with a Feather Touch focuser via this adapter eliminates the common issue of image shift found in many stock focusers. It also provides a much higher load capacity for heavy cameras and accessories, preventing flexure and ensuring your focus point remains stable throughout an imaging session.

    Does this adapter introduce any flexure into my imaging train?

    No. This adapter is machined by Starlight Instruments from high-grade aluminum to be a solid, single-piece connector. Its primary design goal is to create a rigid connection that eliminates flexure, ensuring your focuser and camera are held securely.

    Is this the correct adapter for a 3.0" Feather Touch focuser?

    No, this adapter is designed exclusively for Starlight Instruments' 2.0" focusers. You will need a different adapter to mount a 2.5", 3.0", or larger focuser.

    How does this adapter attach to my William Optics GT81?

    For the William Optics GT81 and compatible Megrez models, you will typically unthread the entire stock focuser assembly from the optical tube. This adapter then threads directly onto the exposed male threads on the telescope tube, providing the correct flange to bolt on your 2.0" Feather Touch focuser.

  • Telescope Compatibility Astro-Tech 6" & 8" RC, GSO 6" & 8" RC, William Optics Newer Megrez 80mm, Megrez 90mm, GT81
    Focuser Compatibility Starlight Instruments 2.0" Feather Touch Focusers
  • Starlight Instruments 2-Year Warranty