Skip to content
Price match 30-day returns* Talk to an astronomer before you buy
Starizona Nexus Quattro Threaded Focuser Adapter

Starizona Nexus Threaded Focuser Adapter

by Starizona
SKU STZ-TFA-NEX-QTR
CA$56.00 - CA$56.00
CA$56.00
CA$56.00 - CA$56.00
CA$56.00
Price Match Policy!
  • Enables a direct threaded connection to a focuser
  • Replaces the removable lip on the Nexus 0.75x Coma Corrector
  • Improves imaging train rigidity and alignment
  • Available in multiple thread sizes for various focusers
Focuser Thread
Backordered
Request Stock Alert
Availability Info
Qualifies for FREE Shipping in Canada on orders over $500.
Vignetting Calculator

Will your imaging train vignette?

Check which filter and adapter sizes clear the sensor with the Starizona Nexus Threaded Focuser Adapter, and how much light the corners lose.

Check vignetting
  • Description
  • FAQ
  • Specifications
  • In the Box
  • Warranty

  • Nexus Threaded Focuser Adapter

    The Nexus Threaded Focuser Adapter is designed to replace the standard removable lip on the Starizona Nexus 0.75x coma corrector, enabling a solid, threaded connection directly to your focuser. With versions available for threads like M54 x 1, M56, and M58 x 0.75, this adapter bypasses compression rings to create a rigid, tilt-free imaging train essential for sharp, round stars across the entire frame.

    Adapting the Nexus 0.75x for Direct Focuser Threading

    This adapter creates a male thread on the Nexus 0.75x coma corrector, allowing it to be screwed directly into the drawtube of a compatible focuser. By creating a solid metal-on-metal connection, you eliminate the primary sources of tilt and flexure in an imaging train: eyepiece holders that rely on compression rings or set screws. This ensures the coma corrector and camera sensor remain perfectly orthogonal to the optical axis, a critical factor for achieving a flat field with pinpoint stars from edge to edge.

  • What is the purpose of the Nexus Threaded Focuser Adapter?

    Its sole purpose is to create a rigid, secure, threaded connection between a Starizona Nexus 0.75x coma corrector and a focuser. This replaces the less stable connection of a standard 2" nosepiece held by a compression ring, which can introduce tilt into the imaging system.

    How do I choose the correct Nexus adapter for my focuser?

    You must identify the specific female thread size on your telescope's focuser drawtube. Match that thread to one of the available adapter options, such as M54 x 1, M56, or M58 x 0.75, to ensure a direct fit. For example, the Quattro adapter is made for the male M54.5 x 1 thread on Skywatcher Quattro Newtonian focusers.

    Why is a threaded connection better than a 2-inch nosepiece for the Nexus 0.75x corrector?

    A threaded connection provides superior mechanical stability. It prevents the coma corrector from shifting or tilting as the telescope moves, which is a common problem with adapters held in place by a single set screw or a compression ring. For astrophotography, this rigidity is key to maintaining sharp focus and round stars across your entire image sensor.

  • Available Options Quattro, M54 x 0.75, M54 x 1, M56 (GSO/CarbonStar), M57 x 0.75, M58 x 0.75 (Askar N-Series)

    • Nexus Threaded Focuser Adapter

      × 1

  • Starizona Warranty