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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.
Starlight Instruments Eyepiece Adapter Flush Mount w/ Compression Ring (Fits 1.25" Eyepieces)

Starlight Instruments Eyepiece Adapter Flush Mount w/ Compression Ring (Fits 1.25" Eyepieces)

by Starlight Instruments
SKU SI-EA20-205LP
$80.00 - $80.00
$80.00
$80.00 - $80.00
$80.00
Price Match Policy!
  • Adapts 2-inch focusers and diagonals to accept 1.25-inch eyepieces
  • Flush-mount design provides a minimal profile for focus-critical setups
  • Brass compression ring ensures a secure, non-marring grip on eyepiece barrels
  • Machined by Starlight Instruments for precision and durability
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • Starlight Instruments Eyepiece Adapter Flush Mount w/ Compression Ring (Fits 1.25" Eyepieces)

    The Starlight Instruments Eyepiece Adapter securely converts any 2-inch focuser or diagonal to accept standard 1.25-inch eyepieces. This flush-mount adapter is engineered to the same high standards as Feather Touch focusers, providing a solid, perfectly centered connection that protects your optical investment.

    A 1.25" Non-Marring Hold for Your 2" Focuser

    Unlike basic adapters that use a single thumbscrew to dig into your eyepiece barrels, this Starlight Instruments adapter uses a soft brass compression ring. As you tighten the thumbscrew, the internal ring gently and uniformly closes around the eyepiece, preventing scratches, centering it perfectly in the optical axis, and providing a much more secure hold.

    Low-Profile Design for Critical Focus Travel

    The "flush mount" design minimizes the adapter's profile, consuming the least possible amount of precious back focus. This is a critical advantage for instruments like Newtonian reflectors or telescopes equipped with focal reducers, where achieving focus with certain eyepiece combinations can be a challenge. By sitting lower in the drawtube, this adapter gives you the extra in-travel you need.

  • Why use the Starlight Instruments adapter instead of the one that came with my telescope?

    Most stock adapters use a simple set screw that can scratch and dent the barrels of your eyepieces over time. The Starlight Instruments adapter uses a brass compression ring that provides a firm, 360-degree grip without causing any cosmetic damage, while also ensuring better optical alignment.

    What does the "compression ring" on this 1.25" adapter do?

    The compression ring is a thin band of soft brass inside the adapter. When you tighten the thumbscrew, it squeezes this ring evenly around the eyepiece barrel. This mechanism offers two key benefits:

    • No Damage: It prevents the thumbscrew from directly marking or scratching your eyepieces.
    • Secure Centering: It holds the eyepiece perfectly on-axis with the telescope's light path, which is critical for sharp, high-magnification views.

    Will this Starlight Instruments adapter help me reach focus with my 8" f/4 Newtonian?

    Yes, it is an excellent choice for that setup. Fast Newtonians often have limited focuser in-travel. The flush-mount, low-profile design of this adapter takes up less space in the optical path compared to taller adapters, increasing your chances of reaching a sharp focus with all your 1.25" eyepieces.

    Is the Starlight Instruments 2" to 1.25" adapter compatible with all focusers?

    This adapter is designed to fit any standard 2-inch focuser, diagonal, or Barlow lens. Its flush-mount design ensures it will seat fully and securely in any 2-inch receptacle that uses either a compression ring or set-screw locking mechanism.

    How does the flush mount design of this adapter benefit visual observing of the Orion Nebula (M42)?

    When observing large objects like the Orion Nebula (M42) with certain wide-field 1.25" eyepieces and a coma corrector, focus travel can be very tight. The low profile of this adapter can provide the crucial few millimeters of in-travel needed to bring the entire field to a sharp focus, ensuring you see the full extent of the nebulosity and the crisp stars of the Trapezium cluster.

    Does this adapter add any optical elements to the light path?

    No. The Starlight Instruments Eyepiece Adapter is a purely mechanical component. It contains no lenses or glass and will not alter the magnification, focal length, or optical characteristics of your telescope and eyepiece combination.

  • Adapter Type 2-inch to 1.25-inch Reducer
    Outer Barrel Diameter 2-inch
    Inner Barrel Diameter 1.25-inch
    Locking Mechanism Brass Compression Ring with Thumbscrew
    Design Profile Flush Mount (Low Profile)

    • 2" to 1.25" Flush Mount Adapter

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  • Starlight Instruments 2-Year Warranty