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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 85mm PLUS Support Rings

PrimaLuceLab 85mm PLUS Support Rings

by PrimaLuceLab
SKU PLL-PLLANSU85P
$195.00 - $195.00
$195.00
$195.00 - $195.00
$195.00
Price Match Policy!
  • Designed for 85mm Diameter Telescope Tubes
  • High-Precision CNC-Machined Aluminum Construction
  • Hard-Anodized for Durability and Corrosion Resistance
  • Full Integration with the PrimaLuceLab PLUS System
  • Threaded Holes and Slots for Mounting Accessories
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  • Description
  • FAQ
  • Specifications
  • In the Box
  • Downloads
  • Warranty

  • PrimaLuceLab 85mm PLUS Support Rings

    The PrimaLuceLab 85mm PLUS Support Rings offer a rigid, precision-engineered mounting foundation for telescopes with an approximate 85mm tube diameter, such as popular 70mm to 80mm class refractors. Machined from a single block of aluminum, these rings are the core of a stable and versatile astronomical setup, eliminating the flexure common in lesser mounting solutions.

    CNC-Machined Support for 85mm Optical Tubes

    Each ring is CNC-machined from a solid block of high-grade aluminum, ensuring perfect roundness and structural integrity. The material is then sandblasted to create a smooth finish and hard-anodized to increase surface hardness and protect against oxidation. This manufacturing process results in a support system that is significantly more rigid than cast or bent-metal rings, which is critical for maintaining alignment during long-exposure astrophotography.

    Integrated with the PLUS System for Total Modularity

    These 85mm rings are a central component of the Prima Luce Universal System (PLUS). The PLUS ecosystem is defined by a pattern of standardized threaded holes and slots that allow for direct, secure attachment of other PLUS components. You can bolt dovetail plates to both the top and bottom of the rings, add guide rings for a guide scope, or attach a dovetail clamp to mount a second instrument in parallel—all without the instability of stacked adapters.

    Universal Compatibility Beyond the PLUS Ecosystem

    While optimized for the PLUS system, PrimaLuceLab designed these rings for broad compatibility. A series of central slots allows you to fasten plates and accessories from other manufacturers using standard screws. This thoughtful design ensures you can integrate the superior rigidity of the 85mm PLUS rings into your existing setup, regardless of the brands you currently use.

  • What telescopes are the PrimaLuceLab 85mm PLUS Support Rings designed for?

    These rings are designed for any optical tube with an outer diameter of approximately 85mm. This commonly includes many popular 70mm and 80mm refractor telescopes. It is always best to measure your telescope's tube diameter to ensure a proper fit.

    What is the PrimaLuceLab PLUS system and how do these 85mm rings fit in?

    The PLUS system is PrimaLuceLab's modular ecosystem of plates, clamps, rings, and other accessories that share a common, pre-drilled hole pattern. The 85mm PLUS Support Rings act as a foundational component, allowing you to securely bolt other PLUS accessories directly to them, creating a solid, flex-free mechanical assembly for your imaging rig.

    Can I use the 85mm PLUS rings with a dovetail plate from another brand?

    Yes. In addition to the threaded holes for the PLUS system, the rings feature central slots that accommodate screws for attaching third-party dovetail plates or other accessories. This ensures you can benefit from the rigidity of the PLUS rings even if you haven't fully adopted the PLUS ecosystem.

    How do I attach a guide scope to my 80mm refractor using the 85mm PLUS Support Rings?

    To mount a guide scope, you would first attach a PLUS dovetail plate (such as a Vixen or Losmandy style plate) to the top of the 85mm PLUS Support Rings. Then, you can attach PLUS guide rings directly to that top plate, providing a stable, adjustable platform for your guide scope.

    What's the advantage of CNC-machined rings like the 85mm PLUS rings over cast rings?

    CNC (Computer Numerical Control) machining creates parts from a solid block of aluminum with extremely high precision. This process results in rings that are stronger, more rigid, and have tighter tolerances than cast rings, which are made by pouring molten metal into a mold. For astrophotography, this superior rigidity is crucial for preventing mechanical flexure that can ruin long exposures.

    I have a William Optics ZenithStar 73. What else do I need to mount it on a Celestron AVX mount using these 85mm rings?

    After securing your ZenithStar 73 in the 85mm PLUS Support Rings, you will need to attach a PLUS Vixen-style dovetail plate to the bottom of the rings. The Celestron AVX mount uses a Vixen-style saddle, so this plate will allow you to securely mount the entire telescope assembly onto the mount head.

  • Supported Tube Diameter 85mm
    Construction CNC-machined from a single block of aluminum
    Finish Sandblasted and hard-anodized
    Mounting System PrimaLuceLab PLUS
  • PrimaLuceLab 1-Year Warranty