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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 2.5" Adapter for United Optics Manufactured 80mm Telescope

by Starlight Instruments
SKU SI-A25-2003-5
$250.00 - $250.00
$250.00
$250.00 - $250.00
$250.00
Price Match Policy!
  • Adapts 2.5" Feather Touch focusers to select 80mm telescopes
  • Specifically designed for refractors manufactured by United Optics
  • Provides a secure, rigid mounting point for heavy imaging systems
  • Enables precision focusing for high-resolution astrophotography
  • Machined by Starlight Instruments in the USA
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  • Description
  • FAQ
  • Warranty

  • Starlight Instruments 2.5" Adapter for United Optics Manufactured 80mm Telescope

    This Starlight Instruments adapter provides the critical mechanical interface to upgrade a United Optics manufactured 80mm refractor with a 2.5" Feather Touch focuser. It creates a secure, perfectly aligned connection, allowing you to replace the telescope's stock focuser with a robust, imaging-grade system capable of handling heavy cameras and accessories without flexure.

    Seamless Integration for 2.5" Feather Touch Focusers

    This adapter is engineered specifically to match the tube mounting pattern of 80mm refractors made by United Optics, ensuring a perfect fit. It allows you to install a Starlight Instruments 2.5" Feather Touch focuser, transforming the optical tube into a platform for serious astrophotography. The result is an ultra-smooth, zero-shift focusing experience that the original stock focuser cannot match.

    The Foundation for 80mm Wide-Field Astrophotography

    An 80mm refractor is ideal for wide-field targets, but imaging with a heavy camera, filter wheel, and off-axis guider can overwhelm a standard focuser, causing tilt and ruining images. This adapter provides the rigid foundation needed to support a 2.5" Feather Touch focuser, which is designed to carry heavy loads. This upgrade is essential for achieving sharp, round stars across the entire frame.

  • What is the primary purpose of this Starlight Instruments 2.5" adapter?

    This adapter allows you to remove the stock focuser from a United Optics manufactured 80mm telescope and replace it with a superior Starlight Instruments 2.5" Feather Touch focuser. It bridges the mechanical connection between the optical tube and the new, larger focuser.

    How do I know if my 80mm telescope was made by United Optics?

    United Optics is an original equipment manufacturer (OEM) that produces telescopes for many popular brands. If you are unsure about your telescope's origin, it is best to check with your telescope's vendor or measure the mounting pattern on your optical tube to confirm compatibility before purchasing.

    Why would I upgrade the focuser on my 80mm refractor?

    Upgrading to a Starlight Instruments Feather Touch focuser provides significant benefits, especially for astrophotography:

    • Increased Load Capacity: Securely holds heavy cameras, filter wheels, and other accessories without sagging or tilt.
    • Precision Focusing: The dual-speed fine focus knob allows for extremely precise adjustments, critical for achieving sharp focus.
    • Zero Image-Shift: Eliminates the focus shift and wobble common in many stock focusers.

    Will this adapter help when imaging the Andromeda Galaxy (M31) with my 80mm scope?

    Yes. A wide-field target like the Andromeda Galaxy (M31) requires long exposures with a potentially heavy imaging train. By enabling the installation of a 2.5" Feather Touch focuser, this adapter ensures your focusing system remains rigid and stable throughout the imaging session, preventing flexure that can elongate stars at the edge of the frame.

    Can I use this adapter to attach a 3" Feather Touch focuser?

    No, this adapter is specifically machined to fit the mounting flange of a Starlight Instruments 2.5" Feather Touch focuser. You would need a different adapter for a 3" or larger model.

    Is installing this adapter on my 80mm telescope a difficult process?

    Installation typically involves unthreading the stock focuser from the rear of the optical tube and threading this adapter in its place. The new 2.5" Feather Touch focuser then attaches to the adapter. While generally straightforward, it requires care to avoid damaging the optics. Refer to the instructions provided with your focuser for detailed steps.

  • Starlight Instruments 2-Year Warranty