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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 2.0" Adapter for Astro-Physics End Cap
Starlight Instruments 2.0" Adapter for Astro-Physics End Cap

Starlight Instruments 2.0" Adapter for Astro-Physics End Cap

by Starlight Instruments
SKU SI-A20-259
$120.00 - $120.00
$120.00
$120.00 - $120.00
$120.00
Price Match Policy!
  • Connects Starlight 2.0" Focusers to Astro-Physics Accessories
  • Creates a Secure, All-Threaded Optical Train
  • Eliminates Potential for Sag from Compression Rings
  • Machined for a Precise Fit Between Brands
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  • Description
  • FAQ
  • Warranty

  • Starlight Instruments 2.0" Adapter for Astro-Physics End Cap

    The Starlight Instruments 2.0" Adapter for Astro-Physics End Cap provides the critical mechanical link between a 2.0" Feather Touch focuser and Astro-Physics' renowned field flatteners and reducers. By replacing the standard 2.0" compression ring end cap, this adapter creates a rigid, all-threaded connection, essential for eliminating tilt and sag in a demanding astrophotography setup.

    A Threaded Connection for Astro-Physics Optics

    For serious imaging, a compression ring is a point of potential flexure. This adapter solves that by providing a direct, threaded attachment for Astro-Physics optical correctors, ensuring your camera sensor remains perfectly orthogonal to the optical axis. This rigidity preserves the flat field and pinpoint stars your Astro-Physics optics are designed to deliver.

    Compatibility with 2.0" Starlight Instruments Feather Touch Focusers

    This adapter is engineered to thread directly onto the drawtube of Starlight Instruments 2.0" Feather Touch focusers, such as the FTF20xx series Crayford and Rack & Pinion models. It replaces the stock compression ring end cap, a simple conversion that provides a dedicated, robust interface for your Astro-Physics equipment. Note that this creates a dedicated connection; you lose the ability to use standard 2" slip-fit eyepieces without swapping the end cap back.

  • What is the main purpose of the Starlight 2.0" Adapter for Astro-Physics End Cap?

    Its primary purpose is to create a secure, rigid, all-threaded connection between a Starlight Instruments 2.0" Feather Touch focuser and an Astro-Physics threaded accessory, such as a field flattener or telecompressor reducer. This is critical for astrophotography to prevent any tilt or sag in the imaging train.

    Which Starlight Instruments focusers is this Astro-Physics adapter compatible with?

    This adapter is designed for Starlight Instruments focusers with a 2.0" drawtube that features a removable end cap. This includes the popular FTF20xx series of 2.0" Feather Touch Crayford and Rack & Pinion focusers.

    Why should I use this adapter instead of the standard 2.0" compression ring for imaging?

    A standard compression ring holds accessories with a thumbscrew, which can introduce a small amount of tilt and is a potential point of flexure, especially with heavier cameras. A threaded connection, like the one this adapter provides, ensures perfect centration and rigidity, which is essential for maintaining sharp stars across a flat field.

    Will this adapter work with my Astro-Physics refractor's stock focuser?

    No. This adapter is specifically designed to be installed on a Starlight Instruments 2.0" focuser. It allows you to use Astro-Physics accessories with a Starlight focuser, not to modify an Astro-Physics focuser.

    How does this adapter help when imaging a faint galaxy like the Triangulum Galaxy (M33) with an Astro-Physics reducer?

    When taking long exposures of a faint, large object like M33, any amount of tilt in the optical train will result in elongated stars in the corners of your image. This adapter ensures your camera and Astro-Physics reducer are held perfectly square to the focuser, maintaining the corrector's performance and keeping stars pinpoint across the entire frame throughout the imaging session.

    I have a Celestron SCT with a Feather Touch Microfocuser. Can I use this adapter?

    No. The Feather Touch Microfocuser is an upgrade to the telescope's existing focusing knob and does not replace the entire focuser assembly or its visual back. This adapter is for full Starlight Instruments 2.0" replacement focusers (like the FTF20xx series) that have a drawtube with a removable end cap.

  • Starlight Instruments 2-Year Warranty