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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 United Optics 115mm Telescope

by Starlight Instruments
SKU SI-A30-1903-16
$250.00 - $250.00
$250.00
$250.00 - $250.00
$250.00
Price Match Policy!
  • Connects Starlight Instruments 3.0" Focusers
  • Designed for United Optics 115mm Telescopes
  • Also Fits Orion EON 115mm Refractors
  • Provides a Secure, Thread-On Connection
  • Machined for a Precise, No-Flex Fit
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  • Description
  • FAQ
  • Specifications
  • Warranty

  • Starlight Instruments 3.0" Adapter for United Optics 115mm Telescope

    This Starlight Instruments adapter provides the precise, secure connection required to mount a 3.0" Feather Touch focuser onto your United Optics 115mm or Orion EON 115mm refractor. By replacing the stock focuser, this adapter is the critical first step in creating a rigid, zero-flexure imaging train capable of handling heavy cameras and filter wheels.

    Enabling the 3.0" Feather Touch Upgrade for Serious Imaging

    The stock focuser on many telescopes is a common point of weakness, introducing image shift and flexure, especially under the load of a modern imaging setup. This adapter allows you to install a Starlight Instruments 3.0" Feather Touch focuser, replacing the original unit with a helical rack-and-pinion system known for its smooth motion and high load capacity. The result is precise, repeatable focusing and the elimination of frustrating image shift during long exposures.

    A Zero-Flexure Fit for 115mm United Optics & Orion EON Telescopes

    This is not a generic adapter; it is specifically machined by Starlight Instruments to match the thread pattern and tube curvature of the United Optics 115mm and Orion EON 115mm refractors. This custom fit ensures perfect axial alignment between the focuser and the telescope's optics. The robust, all-metal construction provides a solid, thread-on connection that becomes a rigid part of the optical tube, preventing any tilt or sag.

  • What is the purpose of this Starlight Instruments 3.0" adapter?

    This adapter's sole purpose is to allow you to securely attach a Starlight Instruments 3.0" Feather Touch focuser to a United Optics 115mm or Orion EON 115mm telescope. It bridges the mechanical connection between the telescope tube and the upgraded focuser.

    Which Starlight Instruments focusers is this 3.0" adapter compatible with?

    This adapter is designed for Starlight Instruments focusers with a 3.0" body, such as the FTF30xx series. It provides the necessary threading to mount these larger, more robust focusers onto the specified telescopes.

    Why should I upgrade the stock focuser on my Orion EON 115mm telescope?

    Upgrading to a Feather Touch focuser using this adapter provides significant benefits for astrophotography. A Starlight Instruments focuser eliminates image shift, provides ultra-fine focus control, and can support heavy imaging trains (camera, filter wheel, off-axis guider) without flexure, leading to sharper stars across your images.

    How will this adapter improve my deep-sky imaging with a heavy camera on a United Optics 115mm refractor?

    When imaging an object like the Andromeda Galaxy (M31) with a heavy camera, the stock focuser can sag, causing tilted stars in the corners of your frame. This adapter creates a rigid, non-flexing connection for a Feather Touch focuser, ensuring your camera sensor remains perfectly perpendicular to the light path, even when the telescope is pointed near the zenith.

    Is the installation of this 115mm telescope adapter difficult?

    Installation is straightforward for users comfortable with basic telescope maintenance. It typically involves unthreading the stock focuser from the optical tube and threading this adapter in its place. The 3.0" Feather Touch focuser then attaches to the adapter. Always ensure the telescope is positioned securely and horizontally during the process.

    Will this adapter work with any other telescopes besides the United Optics and Orion EON 115mm models?

    No. This adapter is machined with a specific thread size and pitch to match only the United Optics 115mm and Orion EON 115mm refractors. Attempting to use it on other telescopes will likely result in damage to the threads on both the adapter and the optical tube.

  • No specifications available for this product.
  • Starlight Instruments 2-Year Warranty