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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 2.5" End Cap w/2.7" A/P Female Threads

Starlight Instruments 2.5" End Cap w/2.7" A/P Female Threads

by Starlight Instruments
SKU SI-EC25-2005-4
$150.00 - $150.00
$150.00
$150.00 - $150.00
$150.00
Price Match Policy!
  • Adapts 2.5" Feather Touch focusers
  • Provides female Astro-Physics 2.7" threads
  • Enables secure, threaded connection to A/P accessories
  • Machined from high-quality aluminum
  • Precision-finished by Starlight Instruments in the USA
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  • Description
  • FAQ
  • Specifications
  • Downloads
  • Warranty

  • Starlight Instruments 2.5" End Cap w/2.7" A/P Female Threads

    The Starlight Instruments 2.5" End Cap with 2.7" A/P Female Threads provides a direct, rigid connection between your 2.5" Feather Touch focuser and the extensive line of Astro-Physics field flatteners, telecompressor correctors, and other accessories that use the male 2.7" thread standard. This essential adapter replaces the standard compression ring end cap, eliminating any potential for tilt or sag in a demanding imaging train by creating a fully threaded optical path.

    Astro-Physics 2.7" Thread Integration for 2.5" Feather Touch Focusers

    For imagers who have standardized their optical train around the robust Astro-Physics 2.7" connection, this end cap is the critical component for integration with a Starlight Instruments 2.5" focuser. It allows you to securely attach accessories like the A/P 2.7" Photo-Visual Telecompressor (27TVPH) or other flatteners directly to the focuser drawtube, maintaining perfect axial alignment from the focuser to the camera sensor.

    Starlight Instruments In-House Precision Machining

    Machined from a solid piece of high-grade aluminum, this end cap reflects the same commitment to precision found in every Feather Touch focuser. The threads are cut to exact tolerances to ensure a smooth, secure fit with your Astro-Physics accessories. The entire part is finished in-house at Starlight Instruments, guaranteeing a perfect match in both quality and appearance to your existing equipment.

  • What is the primary purpose of the Starlight Instruments 2.5" End Cap w/2.7" A/P Female Threads?

    This end cap is designed to replace the standard end cap on a 2.5" Starlight Instruments Feather Touch focuser. It allows you to directly thread on accessories that use the male Astro-Physics 2.7-inch thread standard, creating a more secure connection for astrophotography compared to a compression ring.

    Which Starlight Instruments focusers is this end cap compatible with?

    This end cap is specifically designed for the Starlight Instruments family of 2.5" Feather Touch focusers, such as the FTF25xx series. It is not compatible with their 2.0", 3.0", or 3.5" models.

    I have an Astro-Physics 2.7" field flattener. Will this end cap let me attach it to my Starlight Instruments FTF2525 focuser?

    Yes, absolutely. This is the exact application for this adapter. It provides the female 2.7" A/P threads needed to securely mount your field flattener directly to the focuser's drawtube, ensuring a rigid, tilt-free imaging train.

    How does this end cap ensure a rigid connection for a heavy imaging train?

    By creating a fully threaded connection, this end cap eliminates the possibility of slippage or tilt that can occur with compression rings or single-thumbscrew holders. For heavy imaging setups involving a large sensor camera, filter wheel, and off-axis guider, a rigid threaded connection is crucial for maintaining sharp, round stars across the entire field.

    Does this Starlight Instruments end cap allow for collimation or tilt adjustment?

    Many Starlight Instruments end caps include small set screws for tilt adjustment. While this specific model is designed for a direct, rigid fit, you should inspect the unit upon arrival for adjustment screws. The primary alignment is maintained by the high-precision machining of the focuser and the end cap itself.

    How do I install this 2.5" end cap on my Feather Touch focuser?

    Installation is straightforward. You typically unscrew the existing end cap (often held by three small set screws around its circumference) from the end of the focuser drawtube. You then screw the new end cap with 2.7" A/P threads into its place, ensuring it is seated firmly.

  • Focuser Compatibility Starlight Instruments 2.5" Feather Touch Focusers
    Accessory Thread 2.7" Astro-Physics Female Thread
    Material Aluminum
  • Starlight Instruments 2-Year Warranty