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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.
PrimaLuceLab 131mm PLUS Support Rings

PrimaLuceLab 131mm PLUS Support Rings

by PrimaLuceLab
SKU PLL-PLLANSU131P
$285.00 - $285.00
$285.00
$285.00 - $285.00
$285.00
Price Match Policy!
  • Internal Diameter: 131mm
  • Material: CNC-machined from a single block of aluminum
  • System Compatibility: Part of the PrimaLuceLab PLUS modular system
  • Finish: Sandblasted and hard anodized for durability
  • Mounting: Pre-drilled with threaded holes and slots for plates and accessories
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • PrimaLuceLab 131mm PLUS Support Rings

    The PrimaLuceLab 131mm PLUS Support Rings provide a rigid, system-integrated mounting solution for optical tubes with an approximate 131mm diameter, such as the SkyWatcher ESPRIT 100ED refractor. Engineered as a core component of the PrimaLuceLab PLUS ecosystem, these rings replace standard, often flexible, factory rings with a solid, CNC-machined foundation for your entire imaging train.

    A Precise 131mm Fit for Mid-Size Refractors

    Designed for telescopes requiring a 131mm internal diameter, these rings provide a secure, non-marring grip on your optical tube. This precise fit is critical for maintaining mechanical alignment and preventing flexure, especially when supporting the weight of a camera, filter wheel, and guide scope. They are an ideal upgrade for owners of mid-size refractors seeking a more stable connection to their mount.

    Full Integration with the PrimaLuceLab PLUS System

    These are not just tube rings; they are the backbone of a modular mounting system. The 131mm PLUS rings feature an array of threaded holes and slots that allow for the direct, secure attachment of PLUS dovetail plates, clamps, and guide rings. This design lets you build a compact and incredibly rigid assembly, attaching a guide scope above or a control computer below your main telescope without any instability.

    • Top and Bottom Mounting: Attach Losmandy or Vixen-style plates to both the top and bottom of the rings simultaneously for maximum rigidity and accessory space.
    • Cross-Brand Compatibility: Central slots are included to allow the attachment of plates and accessories from other manufacturers, ensuring the rings can be integrated into your existing setup.
    • PLUS Ecosystem: Seamlessly connect other PrimaLuceLab components like guide rings and dovetail clamps to create a unified, flexure-free mechanical support system.

    CNC-Machined for Zero-Flexure Support

    Each ring is machined from a single block of high-grade aluminum using high-precision CNC machines, eliminating the weak points found in cast or multi-part rings. The aluminum is then sandblasted to create a smooth finish and hard-anodized to increase surface hardness and protect against oxidation. This manufacturing process ensures that the rings contribute zero flexure to your optical system, preserving the integrity of your guiding and imaging data.

  • What telescopes are compatible with the PrimaLuceLab 131mm PLUS rings?

    These rings are designed for any telescope optical tube with an approximate diameter of 131mm. They are a confirmed fit for telescopes like the SkyWatcher ESPRIT 100ED and other similarly sized mid-range refractors.

    How do the 131mm PLUS rings help build a rigid imaging setup for my SkyWatcher ESPRIT 100ED?

    By replacing the stock rings, the 131mm PLUS rings offer a far more rigid connection point. Their CNC-machined, single-block construction prevents flexure. Furthermore, the integrated system of threaded holes allows you to directly bolt on PLUS dovetail plates and guide rings, creating a single, solid structure from your mount to your guide scope, which is critical for accurate autoguiding.

    What advantages do the PrimaLuceLab 131mm PLUS rings have over generic tube rings?

    The primary advantage is their integration into the PLUS (Prima Luce Universal System). Unlike generic rings that may only offer a few standard mounting holes, PLUS rings are designed as part of a complete ecosystem. This allows for more secure, versatile, and flexure-free attachment of plates, guide scopes, and other accessories without drilling or adapters.

    Can I attach accessories from other brands to the 131mm PLUS rings?

    Yes. PrimaLuceLab has designed the 131mm PLUS rings with a series of central slots in addition to the PLUS-specific threaded holes. These slots allow you to use standard screws to attach dovetail plates or other mechanical accessories from different manufacturers.

    Why are the 131mm PLUS rings made from CNC-machined aluminum?

    CNC (Computer Numerical Control) machining from a solid block of aluminum ensures the highest possible precision and structural integrity. This process eliminates the internal stresses and potential weak points of cast metal, resulting in a set of rings that are incredibly strong and will not bend or flex under the load of a heavy imaging setup.

    I'm concerned about flexure in my imaging train. How do the 131mm PLUS rings address this?

    Flexure is the primary issue the 131mm PLUS rings are built to solve. They address it in two ways:

    • Material Strength: The solid, CNC-machined aluminum construction is inherently resistant to bending.
    • System Rigidity: By allowing you to bolt accessories directly to the rings, they eliminate intermediate adapters or stacked plates, which are common sources of mechanical flex. This creates a shorter, more rigid mechanical train.
  • Internal Diameter 131mm

  • This product consists of support rings only. No additional items are included in the box.

  • No manual or software is available for this product.

  • PrimaLuceLab Warranty Policy