Skip to content
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" End Cap w/ 2.0" Compression Ring Opening
Starlight Instruments 3.5" End Cap w/ 2.0" Compression Ring Opening
Starlight Instruments 3.5" End Cap w/ 2.0" Compression Ring Opening

Starlight Instruments 3.5" End Cap w/ 2.0" Compression Ring Opening

by Starlight Instruments
SKU SI-EC35-505CR
$160.00 - $160.00
$160.00
$160.00 - $160.00
$160.00
Price Match Policy!
  • Adapts 3.5" Feather Touch focusers to use 2.0" accessories
  • Features a secure, non-marring brass compression ring
  • Secured by multiple machined thumb screws for a solid grip
  • Machined from high-quality aluminum for durability
  • Matches the precision finish of Starlight Instruments focusers
Backordered
Request Stock Alert
Availability Info
Qualifies for FREE Shipping in CONUS on orders over $350.
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • Starlight Instruments 3.5" End Cap w/ 2.0" Compression Ring Opening

    The Starlight Instruments 3.5" End Cap adapts your Feather Touch focuser to accept standard 2.0" accessories, providing a direct-fit connection for the vast ecosystem of 2-inch eyepieces and cameras. This end cap provides a robust, non-marring grip via a brass compression ring, machined to the same high standards as the 3.5" focuser itself.

    A Secure 2.0" Interface for Your 3.5" Feather Touch Focuser

    This end cap allows you to seamlessly integrate any 2.0" accessory with your large-format 3.5" Feather Touch focuser. It replaces the focuser's original end cap, enabling the use of standard 2.0" diagonals, eyepieces, coma correctors, and camera nosepieces without compromising the stability of your optical train. As a genuine Starlight Instruments component, it ensures perfect threading and a flush fit.

    Starlight Instruments Quality: A Non-Marring Grip for 2.0" Accessories

    Machined in-house from high-quality aluminum, this end cap is built to the same exacting standards as the focusers it complements. The internal brass compression ring distributes pressure evenly around your accessory's barrel, preventing the scratches and dents caused by single set-screws. Multiple thumb screws lock down heavy equipment, ensuring your camera or eyepiece remains perfectly centered and secure, even when the telescope is aimed near the zenith.

  • What focusers is the Starlight Instruments 3.5" End Cap compatible with?

    This end cap is designed specifically for Starlight Instruments Feather Touch 3.5" focusers. It provides a threaded, direct-fit replacement for the original end cap.

    How does the 2.0" compression ring on this End Cap protect my accessories?

    The internal brass compression ring creates a uniform grip around the barrel of your eyepiece or camera nosepiece. Unlike a simple set screw that digs into one point, this mechanism prevents marring and ensures a more secure, centered hold on your valuable accessories.

    Why are there multiple thumb screws on the Starlight Instruments 3.5" End Cap?

    Using multiple thumb screws provides a stronger and more stable grip, which is critical when using heavy accessories like large eyepieces, diagonals, or an imaging camera. The distributed pressure prevents any tilt or flexure in the optical train, maintaining precise alignment.

    Is this Starlight Instruments End Cap made from the same materials as my Feather Touch focuser?

    Yes. It is machined from the same high-quality aluminum and finished in the Starlight Instruments shop to ensure it perfectly matches the look, feel, and durability of your Feather Touch focuser.

    I use a large refractor with a 3.5" Feather Touch focuser. Is this end cap strong enough to hold a 2" diagonal and a heavy eyepiece?

    Absolutely. This end cap is engineered to handle heavy loads. The combination of its robust aluminum construction and the secure grip from the multi-screw compression ring makes it ideal for supporting a 2" diagonal with a heavy eyepiece or a full imaging camera setup on your refractor.

    How does the Starlight Instruments 3.5" End Cap help when imaging an object like the Andromeda Galaxy (M31) with a 2" filter?

    For imaging M31, you might use a 2" filter wheel or a camera with a 2" nosepiece that accepts filters. This end cap provides the necessary 2.0" opening and a secure, flex-free connection for that equipment, ensuring your camera and filters are held rigidly in the optical path for long exposures.

  • Compatibility Starlight Instruments 3.5" Feather Touch Focusers
    Accessory Opening 2.0"
    Locking Mechanism Brass Compression Ring with Multiple Thumbscrews
    Material High-Quality Aluminum

    • 3.5" End Cap w/ 2.0" Compression Ring

      × 1

  • Starlight Instruments 2-Year Warranty