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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 3.0" Adapter for Astro-Physics 4" Telescopes

by Starlight Instruments
SKU SI-A30-1903-21
$250.00 - $250.00
$250.00
$250.00 - $250.00
$250.00
Price Match Policy!
  • Connects 3.0" Feather Touch Focusers to Astro-Physics 4" Telescopes
  • Ensures a Rigid, Flex-Free Imaging Train
  • Precision-Machined from High-Grade Aluminum
  • Durable Black Anodized Finish
  • Made in the USA
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  • Description
  • FAQ
  • In the Box
  • Warranty

  • Starlight Instruments 3.0" Adapter for Astro-Physics 4" Telescopes

    The Starlight Instruments 3.0" Adapter provides the essential mechanical link for upgrading your 4" Astro-Physics refractor with a 3.0" Feather Touch focuser. This component is specifically engineered to match the tube threading of Astro-Physics 4" telescopes, ensuring a rigid and perfectly aligned connection for your imaging train.

    Securely Mount a 3.0" Feather Touch Focuser

    This adapter allows you to replace the stock focuser on your Astro-Physics 4" refractor with a Starlight Instruments 3.0" Feather Touch focuser. By creating a direct, threaded connection to the telescope's optical tube, it forms a solid foundation for supporting heavy cameras, filter wheels, and other accessories without introducing tilt or flexure.

    Starlight Instruments' Precision Machining

    Machined in-house in the USA from high-grade aluminum, this adapter reflects Starlight Instruments' reputation for uncompromising quality. The black anodized finish not only protects against corrosion but also matches the professional aesthetic of both the Astro-Physics telescope and the Feather Touch focuser, creating a seamless, integrated assembly.

  • Why do I need the Starlight Instruments 3.0" Adapter for my Astro-Physics 4" telescope?

    This adapter is required to physically connect a Starlight Instruments 3.0" Feather Touch focuser to the optical tube of an Astro-Physics 4" refractor. It is custom-machined to match the specific threads of the telescope, ensuring a secure, perfectly centered fit that a generic adapter cannot guarantee.

    Will this Starlight Instruments 3.0" Adapter fit any telescope other than an Astro-Physics 4" model?

    No. This adapter is designed exclusively for the thread pattern and dimensions of Astro-Physics 4" refractors. Attempting to use it on other telescopes, even those with similar aperture, will likely result in an improper fit.

    I plan to use a large sensor camera on my Astro-Physics 4" refractor. Will the Starlight Instruments 3.0" Adapter provide a rigid connection?

    Yes. The primary purpose of this adapter is to create a solid, flex-free connection between the telescope and a high-payload focuser like the 3.0" Feather Touch. Its single-piece machined construction is designed to handle the weight of demanding imaging trains without compromise.

    How is the Starlight Instruments 3.0" Adapter installed on an Astro-Physics 4" telescope?

    Installation typically involves unthreading the stock focuser assembly from the rear of the optical tube. The Starlight Instruments adapter is then threaded onto the telescope tube in its place. Finally, the 3.0" Feather Touch focuser is secured to the adapter.

    Does this Starlight Instruments adapter allow the 3.0" focuser to rotate?

    The rotational capability is a feature of the Feather Touch focuser itself, not the adapter. This adapter provides the fixed, secure mounting point, and the focuser's own rotation mechanism (if equipped) will function as designed once attached.

    Is the Starlight Instruments 3.0" Adapter compatible with the stock focuser on my Astro-Physics 4" telescope?

    No. This adapter is a replacement part, not an add-on. It is used to mount a Starlight Instruments 3.0" Feather Touch focuser in place of the original focuser that came with your Astro-Physics telescope.

    • 3.0" Adapter for Astro-Physics 4" Telescopes

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  • Starlight Instruments 2-Year Warranty