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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" End Cap w/ 2.0" Compression Ring Opening

Starlight Instruments 3.0" End Cap w/ 2.0" Compression Ring Opening

by Starlight Instruments
SKU SI-EC30-1905-1
$150.00 - $150.00
$150.00
$150.00 - $150.00
$150.00
Price Match Policy!
  • Adapts 3.0" Feather Touch Focusers for 2.0" Accessories
  • Internal Brass Compression Ring for a Secure Grip
  • Non-Marring Design Protects Eyepiece and Camera Barrels
  • Dual Thumbscrews for Added Security
  • Precision Machined by Starlight Instruments in the USA
1 in stock
Qualifies for FREE Shipping in CONUS on orders over $350.
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • Starlight Instruments 3.0" End Cap w/ 2.0" Compression Ring Opening

    The Starlight Instruments 3.0" End Cap provides a secure, non-marring interface to connect standard 2.0" accessories to your 3.0" Feather Touch focuser. By using an internal brass compression ring, this end cap grips your 2.0" eyepiece and camera barrels uniformly, preventing the scratches and tilt associated with single-screw designs.

    Securely Connect 2" Accessories to Your 3.0" Feather Touch Focuser

    This end cap threads directly onto the drawtube of a Starlight Instruments 3.0" Feather Touch focuser, converting it to the industry-standard 2.0" format. The internal brass compression ring distributes pressure evenly around the barrel of your eyepiece, diagonal, or camera nosepiece, ensuring a solid connection without leaving marks or scratches on your equipment. Dual oversized thumbscrews allow for confident, tool-free tightening, even with gloves on.

    Compression Ring vs. Threaded: Choosing an End Cap for 2.0" Accessories

    While a threaded connection offers maximum rigidity for a dedicated, heavy imaging train, it lacks flexibility. This 2.0" compression ring end cap is the superior choice for visual observers or imagers who frequently change their setup. You can swap between a diagonal for observing and a camera for imaging in seconds, without the need to unthread your entire imaging train. This design provides a robust, secure hold suitable for most visual and imaging applications while maximizing your time at the telescope.

  • What focusers is this Starlight Instruments 3.0" end cap compatible with?

    This end cap is designed specifically for Starlight Instruments 3.0" Feather Touch focusers, including the FTF3015, FTF3025, and FTF3035 series. It threads onto the end of the focuser's drawtube to allow the use of 2.0" accessories.

    How does the compression ring on this 2.0" end cap prevent damage to my eyepieces?

    Instead of a single set screw that digs into the barrel, this end cap uses a soft, internal brass compression ring. When you tighten the thumbscrews, this ring constricts evenly around the eyepiece barrel, providing a firm, 360-degree grip that won't scratch, dent, or mar the finish of your 2.0" accessories.

    Should I use this 2.0" compression end cap or a threaded one for my imaging setup with a Celestron EdgeHD 11"?

    For a permanently assembled, heavy imaging train (e.g., filter wheel, OAG, and large camera), a fully threaded connection is often preferred for maximum rigidity. However, if you switch between visual use with a 2.0" diagonal and an imaging camera on your EdgeHD 11", this compression ring end cap offers far more convenience and speed without a significant compromise in stability for most setups.

    Will this Starlight Instruments end cap introduce any tilt into my imaging train?

    Starlight Instruments' precision machining and the uniform grip of the brass compression ring are designed to minimize tilt. For critical imaging, ensure your 2.0" accessory barrel is fully seated before tightening the thumbscrews. Many Starlight end caps also include small set screws for collimation (tilt) adjustment to perfectly align the optical train.

    Can I use this 3.0" end cap to attach a 2" diagonal for viewing the Orion Nebula (M42)?

    Absolutely. This is the ideal accessory for that purpose. It allows you to quickly insert and secure your 2.0" diagonal and low-power eyepiece into a 3.0" Feather Touch focuser, giving you a wide, bright field of view perfect for observing large objects like the Orion Nebula (M42) or the Andromeda Galaxy (M31).

    Is it difficult to install this 3.0" end cap on my Feather Touch focuser?

    Installation is straightforward. You simply unthread the existing end cap from the focuser's drawtube and thread this new one on in its place. The entire process takes less than a minute and requires no tools.

  • Focuser Compatibility Starlight Instruments 3.0" Feather Touch Focusers
    Accessory Opening 2.0" with Brass Compression Ring
    Attachment Method Threads onto Focuser Drawtube

    • 3.0" End Cap w/ 2.0" Compression Ring Opening

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  • Starlight Instruments 2-Year Warranty