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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 3.5" Adapter for Astro-Tech 130

by Starlight Instruments
SKU SI-A35-503-140
$250.00 - $250.00
$250.00
$250.00 - $250.00
$250.00
Price Match Policy!
  • Securely adapts 3.5" Feather Touch focusers to Astro-Tech 130 refractors
  • Machined from high-quality aluminum for maximum rigidity
  • Anodized finish matches Starlight Instruments components
  • Ensures perfect alignment between the focuser and optical tube
  • Provides a non-flexing connection for heavy imaging trains
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  • Description
  • FAQ
  • In the Box
  • Warranty

  • Starlight Instruments 3.5" Adapter for Astro-Tech 130

    This Starlight Instruments adapter ring is the essential mechanical link for upgrading your Astro-Tech 130 refractor with a large-aperture 3.5" Feather Touch focuser. Machined from a single piece of high-grade aluminum, it provides a rigid, perfectly aligned connection between the optical tube and the focuser, eliminating the flexure that can compromise imaging with heavy cameras or accessory loads.

    Precision-Fit for the Astro-Tech 130 Refractor

    Unlike generic adapters, this component is engineered specifically for the Astro-Tech 130 optical tube. This purpose-built design guarantees that the focuser is mounted squarely to the optical axis, preserving the telescope's optical alignment and preventing image shift. The adapter threads directly onto the telescope, creating a solid, reliable foundation for your imaging system.

    The Foundation for a 3.5" Feather Touch Focuser

    Moving to a 3.5" Feather Touch focuser is a significant upgrade for astrophotography, allowing for the use of full-frame cameras, off-axis guiders, and filter wheels without sag or tilt. This adapter provides the robust mounting platform required by these heavy imaging trains. Finished with Starlight Instruments' signature black anodizing, it seamlessly matches the aesthetics of your Feather Touch focuser for a professional, integrated look.

  • Why do I need this specific Starlight Instruments adapter for my Astro-Tech 130?

    This adapter is custom-machined to match the specific thread pattern and diameter of the Astro-Tech 130 optical tube. Using this purpose-built adapter ensures a perfectly centered, non-flexing fit for a 3.5" Feather Touch focuser, which is critical for maintaining optical alignment and achieving sharp images.

    Which focuser does the Starlight Instruments 3.5" Adapter for Astro-Tech 130 support?

    This adapter is designed to connect the Astro-Tech 130 telescope to any of Starlight Instruments' 3.5" Feather Touch focusers. It provides the mechanical interface between the telescope tube and the focuser body.

    Will this Starlight Instruments adapter fit other 130mm refractors?

    No. Telescope manufacturers use different thread sizes and mounting systems on their optical tubes. This adapter is specifically designed for the Astro-Tech AT130 and is not compatible with other 130mm refractors from brands like William Optics, Sky-Watcher, or Tele Vue.

    Is installing the Starlight Instruments 3.5" Adapter for Astro-Tech 130 difficult?

    Installation is straightforward for users comfortable with basic telescope hardware. It typically involves unthreading the stock focuser from the rear of the optical tube and threading this adapter in its place. The 3.5" Feather Touch focuser then attaches to the adapter.

    What is the benefit of upgrading my Astro-Tech 130 with a 3.5" focuser using this adapter?

    Upgrading your Astro-Tech 130 to a 3.5" Feather Touch focuser provides a massive increase in rigidity and lifting capacity. This is essential for serious astrophotography, as it allows you to use heavy imaging trains—including large sensor cameras, filter wheels, and off-axis guiders—without worrying about focuser sag or tilt ruining your exposures.

    How does this adapter help with imaging heavy cameras on my Astro-Tech 130?

    By creating a solid, all-metal connection between the telescope tube and a large-aperture 3.5" focuser, this adapter eliminates the primary source of mechanical flexure in the imaging train. This ensures your camera sensor remains perfectly perpendicular to the light path, resulting in sharper stars across the entire field of view, even during long exposures of faint targets like the Pelican Nebula (IC 5070).

    • 3.5" Adapter for Astro-Tech 130

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  • Starlight Instruments 2-Year Warranty