PrimaLuceLab 90mm PLUS Support Rings
- Fits 90mm Diameter Optical Tubes
- Part of the Modular PLUS System
- CNC-Machined Aluminum Construction
- Weight: 0.5 kg
- Multiple Threaded Holes and Slots for Accessories
The PrimaLuceLab 90mm PLUS Support Rings provide a rigid mounting solution for optical tubes with a 90mm diameter, engineered from a solid block of CNC-machined aluminum. The complete set weighs just 0.5 kg, adding minimal weight while maximizing the mechanical stability of your entire telescope system.
Designed specifically for telescopes with an optical tube diameter of approximately 90mm, these rings serve as the core component for building a stable and versatile imaging rig. By providing a secure grip on the optical tube, they eliminate flexure that can ruin long exposures and allow for the precise attachment of other system components.
As part of the Prima Luce Universal System (PLUS), these 90mm rings are more than just a tube holder; they are a central hub for accessories. The design incorporates a pattern of threaded holes, plain holes, and slots that allow for the direct attachment of PLUS dovetail plates, guide rings, and clamps to both the top and bottom of the rings. This modularity lets you easily mount guide scopes, control computers, or even a second telescope in parallel with maximum rigidity.
Each component is machined with high precision from a single block of aluminum, ensuring perfect fit and alignment. The aluminum is then sandblasted for a smooth finish and hard-anodized to increase durability and resistance to oxidation. This robust construction provides a rock-solid connection that weighs only 0.5 kg, preserving the balance of your mount.
These rings are designed for any telescope with an optical tube diameter of approximately 90mm. This includes many popular refractors, such as the Sky-Watcher Evostar 80ED, or telescopes with a 90mm dew shield diameter like the William Optics RedCat 71.
They provide a rigid, secure connection to the PrimaLuceLab PLUS system, allowing you to easily mount accessories. You can add guide scopes, control units like the ZWO ASIAIR, and dovetail plates on both the top and bottom of your telescope. This modularity creates a more stable and versatile imaging rig with clean cable management.
Yes. The rings feature threaded holes and slots compatible with PLUS guide rings and dovetail clamps (sold separately). This allows you to attach a separate guide scope securely and keep it precisely aligned with your main telescope.
Yes. While designed for the PLUS ecosystem, the rings include a series of central slots that allow you to attach plates and accessories from other brands using standard screws, ensuring broad compatibility with your existing equipment.
Absolutely. You would attach the 90mm PLUS rings to your Evostar 80ED, and then bolt a Losmandy-style PLUS dovetail plate (sold separately) to the bottom of the rings. This provides a secure, rigid connection to your mount's saddle plate.
The RedCat 71's dew shield is 90mm in diameter, making these rings a perfect fit. You can attach a small PLUS Vixen-style plate to the top of the rings, which provides an ideal platform for mounting the ASIAIR directly above the optical tube for a compact setup and clean cable routing.
| Internal Diameter | 90 mm |
| Weight | 0.5 kg |
| Material | CNC-machined Aluminum |
| Finish | Sandblasted and Hard-Anodized |
| System Compatibility | PrimaLuceLab PLUS System |
90mm PLUS Support Rings
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