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Starlight Instruments 2.0" Adapter for William Optics & Astro-Tech/Sky-Watcher Equinox 66mm Telescopes
Starlight Instruments 2.0" Adapter for William Optics & Astro-Tech/Sky-Watcher Equinox 66mm Telescopes
Starlight Instruments 2.0" Adapter for William Optics & Astro-Tech/Sky-Watcher Equinox 66mm Telescopes
Starlight Instruments 2.0" Adapter for William Optics & Astro-Tech/Sky-Watcher Equinox 66mm Telescopes

Starlight Instruments 2.0" Adapter for William Optics & Astro-Tech/Sky-Watcher Equinox 66mm Telescopes

by Starlight Instruments
SKU SI-A20-731
CA$238.00 - CA$238.00
CA$238.00
CA$238.00 - CA$238.00
CA$238.00
Price Match Policy!
  • Enables mounting a 2.0" Feather Touch Focuser
  • Compatible with William Optics Zenithstar 66mm
  • Compatible with Astro-Tech 66mm Refractors
  • Compatible with Sky-Watcher Equinox 66mm Refractors
  • Precision-machined by Starlight Instruments in the USA
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  • Description
  • FAQ
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  • Warranty

  • Starlight Instruments 2.0" Adapter for William Optics & Astro-Tech/Sky-Watcher Equinox 66mm Telescopes

    This Starlight Instruments 2.0" Adapter provides the essential mechanical link to upgrade your William Optics Zenithstar, Astro-Tech, or Sky-Watcher Equinox 66mm telescope with a 2.0" Feather Touch focuser. Machined in-house by Starlight Instruments, it ensures a rigid, perfectly aligned connection between your optical tube and one of the world's most precise focusing systems. This adapter is the first and most critical component for transforming your compact refractor's focusing capabilities for serious astrophotography.

    A Precision-Machined Interface for Compact Refractors

    Starlight Instruments manufactures all components in their Indiana facility, ensuring total control over material quality and tolerances. This adapter is not a generic, mass-produced part; it is engineered specifically for the tube threads of the William Optics Zenithstar, Astro-Tech, and Sky-Watcher Equinox 66mm refractors. The result is a secure, no-flex fit that prevents image shift and maintains optical alignment, a non-negotiable requirement when using heavier cameras or filter wheels.

    The Foundation for a Professional Focuser Upgrade

    By itself, this is a simple component, but its true value is in what it enables: the installation of a Starlight Instruments 2.0" Feather Touch focuser. This upgrade path replaces your telescope's stock unit to deliver the ultra-fine 10:1 focusing, zero backlash, and heavy-duty load capacity needed to achieve critically sharp stars. For imagers, this is the foundation for building an automated, high-resolution optical train.

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

    This adapter is designed to securely connect a Starlight Instruments 2.0" Feather Touch focuser to the optical tube of specific 66mm refractor telescopes from William Optics, Astro-Tech, and Sky-Watcher, allowing you to replace the original stock focuser.

    Which telescopes is this Starlight Instruments adapter compatible with?

    It is specifically designed for the William Optics Zenithstar 66mm, Astro-Tech 66mm, and Sky-Watcher Equinox 66mm models. It provides a direct-thread fit to the rear cell of these telescopes.

    Which focuser models can I install using this adapter?

    This adapter is made for Starlight Instruments' line of 2.0" Feather Touch focusers, including both Crayford and rack-and-pinion versions. It will not work with their larger 2.5", 3.0", or 3.5" focusers.

    How does this adapter improve astrophotography with a Sky-Watcher Equinox 66mm?

    The adapter itself provides a rigid mounting platform. By enabling you to install a Feather Touch focuser, it allows for the precise, repeatable focus adjustments necessary for sharp images. The upgraded focuser can also better support the weight of a dedicated astronomy camera and accessories without slipping or flexing, which is a common limitation of stock focusers.

    After installing this adapter and a Feather Touch focuser, can I use a heavy camera on my 66mm refractor?

    Yes. One of the main reasons for this upgrade is to increase the load-bearing capacity of your focusing system. A Starlight Instruments 2.0" Feather Touch focuser can handle significantly more weight than the stock focusers on these 66mm telescopes, making it suitable for modern CMOS/CCD cameras, filter wheels, and off-axis guiders.

    Is the installation of this Starlight Instruments adapter difficult?

    Installation is generally straightforward for users comfortable with basic telescope hardware. It typically involves unthreading the stock focuser from the optical tube and threading this adapter in its place. You can then attach the 2.0" Feather Touch focuser to the adapter.

  • Starlight Instruments 2-Year Warranty