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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 SBIG and FLI 5 Series/CCD Camera & Filter Wheels

Starlight Instruments 3.0" End Cap for SBIG and FLI 5 Series/CCD Camera & Filter Wheels

by Starlight Instruments
SKU SI-EC30-1905-12
$150.00 - $150.00
$150.00
$150.00 - $150.00
$150.00
Price Match Policy!
  • 3.0" End Cap for Feather Touch Focusers
  • 3.0"-24TPI Male Thread Standard
  • Direct Connection for FLI Proline 16803 Cameras
  • Compatible with Select SBIG & Apogee Filter Wheels
  • Eliminates Tilt and Flexure in Heavy Imaging Trains
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  • Description
  • FAQ
  • In the Box
  • Warranty

  • Starlight Instruments 3.0" End Cap for SBIG and FLI 5 Series/CCD Camera & Filter Wheels

    For a rigid, flex-free imaging train, the Starlight Instruments 3.0" End Cap is the critical link between your 3.0" Feather Touch focuser and high-end cameras. It features 3.0x24tpi male threads for direct attachment to FLI Proline 16803 cameras and specific SBIG or Apogee filter wheels, replacing standard compression rings to ensure perfect optical alignment.

    3.0"-24TPI Threaded Connection for Heavy Imaging Payloads

    When using large-format CCDs and heavy filter wheels, a standard compression ring introduces a potential point of tilt and mechanical flexure. This 3.0" end cap provides a robust, direct-thread solution, ensuring your entire imaging train is rigidly coupled to the focuser drawtube. The 3.0x24tpi male thread specification is the key to maintaining perfect collimation from the focuser all the way to the sensor plane, critical for achieving sharp stars across the field.

    This adapter is engineered for a direct, secure fit with specific professional-grade imaging equipment, including:

    • FLI Compatibility: Threads directly onto the FLI Proline 16803 CCD camera body.
    • SBIG & Apogee: Offers a solid connection for compatible filter wheels from SBIG and Apogee that utilize the 3.0"-24TPI female thread.

  • What is the advantage of this Starlight Instruments 3.0" End Cap over a standard compression ring?

    The primary advantage is rigidity. A threaded connection prevents any possibility of tilt or flexure, which is critical when using heavy cameras like the FLI Proline 16803. This ensures your optical train remains perfectly collimated for sharp stars across the entire sensor.

    Will this 3.0" End Cap fit any 3.0" Feather Touch focuser?

    Yes, this end cap is designed to be interchangeable on Starlight Instruments 3.0" Feather Touch focusers (such as the FTF30xx series). It allows you to customize the focuser's termination for a direct connection to your specific camera or filter wheel.

    How do I install the Starlight Instruments 3.0" End Cap on my focuser?

    Installation involves unthreading the existing end cap (often a 2" compression ring adapter) from the focuser's drawtube and carefully threading this new end cap in its place. Most Feather Touch end caps are designed to be user-interchangeable.

    Is this the right adapter for connecting my FLI Proline 16803 camera to a large refractor?

    This adapter provides the crucial camera-side connection. To complete the imaging train, you will need a 3.0" Feather Touch focuser and the appropriate tube adapter that fits your specific refractor. This end cap then threads onto the drawtube of that focuser to accept the FLI Proline 16803.

    How do I confirm this 3.0"-24TPI end cap will fit my SBIG filter wheel?

    You must verify the female thread specification on your specific SBIG or Apogee filter wheel. This adapter provides a male 3.0"-24TPI (threads per inch) thread. If your equipment requires a different thread pitch, diameter, or gender, you will need a different adapter solution.

    Does this Starlight Instruments adapter add significant length to the optical path?

    All adapters consume some back focus. While designed to be as low-profile as possible, you must account for its physical length when calculating the total back focus of your imaging train to ensure you can reach focus with your specific telescope configuration.

    • 3.0" End Cap for SBIG/FLI

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  • Starlight Instruments 2-Year Warranty