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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 3.0" End Cap for 2.7" Astro-Physics Thread
Starlight Instruments 3.0" End Cap for 2.7" Astro-Physics Thread

Starlight Instruments 3.0" End Cap for 2.7" Astro-Physics Thread

by Starlight Instruments
SKU SI-EC30-1905-3
$150.00 - $150.00
$150.00
$150.00 - $150.00
$150.00
Price Match Policy!
  • Adapts 3.0" Feather Touch focusers to 2.7" accessories
  • Female Thread: 2.7" x 24 TPI
  • Matches Astro-Physics accessory thread standard
  • Enables a fully threaded, rigid imaging train
  • Compatible with select Baader quick-lock accessories
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • Starlight Instruments 3.0" End Cap for 2.7" Astro-Physics Thread

    The Starlight Instruments 3.0" End Cap adapts your 3" Feather Touch focuser to the robust 2.7" x 24 TPI Astro-Physics accessory standard. This single component enables a rigid, all-threaded imaging train, replacing compression fittings for a secure connection to Astro-Physics field flatteners, reducers, and other 2.7" threaded correctors.

    Secure 2.7" x 24 TPI Threaded Connection for Astro-Physics Accessories

    This end cap provides a direct, non-flexing interface between the large drawtube of a 3.0" Feather Touch focuser and the extensive range of Astro-Physics 2.7" threaded accessories. By creating a solid metal-on-metal threaded connection, you eliminate the potential for tilt and sag common with compression rings, which is critical for maintaining a flat field with heavy cameras and complex imaging trains.

    • Focuser Compatibility: Designed specifically for Starlight Instruments 3.0" Feather Touch focusers, ensuring a perfect fit and alignment.
    • Accessory Standard: Features a female 2.7" x 24 TPI thread, matching the male threads on Astro-Physics flatteners, reducers, and extension tubes.
    • Expanded Compatibility: Also enables the use of accessories that adopt the Astro-Physics thread standard, such as the Baader Planetarium 2.7" quick-lock system.

  • What is the primary purpose of this Starlight Instruments 3.0" End Cap?

    This end cap is a specialized adapter. Its sole function is to allow you to securely attach accessories that use the Astro-Physics 2.7" x 24 TPI male thread to a Starlight Instruments 3.0" Feather Touch focuser. This creates a rigid, threaded connection ideal for astrophotography.

    Will this end cap fit my 2.5" Feather Touch Focuser?

    No. This end cap is designed exclusively for the larger 3.0" Feather Touch focusers (FTF30xx series). It will not fit 2.0", 2.5", or 3.5" models. Starlight Instruments makes different end caps for each focuser size.

    Can I use this Starlight Instruments End Cap to attach my Astro-Physics 0.75x CCD Telecompressor to a 3" Feather Touch focuser?

    Yes, absolutely. If your Astro-Physics 0.75x CCD Telecompressor (CCDT67) has the 2.7" male thread, this end cap is the correct component to create a secure, threaded attachment to your 3.0" Feather Touch focuser.

    Does this adapter introduce any flexure compared to a compression ring?

    No, it does the opposite. A threaded connection like the one this end cap provides is significantly more rigid than a compression ring or slip-fit adapter. It is the preferred method for astrophotography as it minimizes tilt and flexure, ensuring your camera sensor remains perfectly orthogonal to the optical axis.

    How does this 2.7" end cap work with Baader Planetarium accessories?

    This end cap can be used with Baader accessories that utilize the Astro-Physics 2.7" thread standard. For example, it allows you to connect a Baader UFC (Universal Filter Changer) or their ClickLock system if they are configured with the appropriate 2.7" male thread adapter.

    Is this the correct part for attaching a 3" accessory to my 3" Feather Touch focuser?

    No. This end cap adapts a 3" focuser down to a 2.7" accessory thread. If you need to attach a 3" threaded accessory, you would need a different end cap with a 3" female thread, not the 2.7" Astro-Physics thread provided by this model.

  • Focuser Compatibility Starlight Instruments 3.0" Feather Touch Focusers (e.g., FTF30xx Series)
    Accessory Thread (Female) 2.7" x 24 TPI
    Thread Standard Astro-Physics

    • 3.0" End Cap for 2.7" Astro-Physics Thread

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  • Starlight Instruments 2-Year Warranty