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Closed October 10–12 for Thanksgiving weekend
Closed October 10–12 for Thanksgiving weekend

Rings

Tube rings do more than hold a telescope. They set how securely it is clamped, whether it can be rotated for framing without dismantling anything, and where accessories can be mounted close to the optical axis instead of hanging off a bracket. David Astro carries tube rings in Canada across a wide range of inner diameters, shipping from Canadian stock.

Sizing depends on measured outer tube diameter, which is rarely the same as the telescope's aperture. Tell us the exact model and we will confirm the ring size.

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CA$203.00 - CA$203.00
CA$203.00
CA$203.00 - CA$203.00
CA$203.00

Farpoint D Series Dovetail Rings - 125mm

FAP-FDR125
Only 2 left!

Safely attach telescope optical accessories with Farpoint 125mm D Style Dovetail Rings.Includes two “D” Losmandy style 125mm I.D. Rings with 3 poin...

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CA$203.00 - CA$203.00
CA$203.00
CA$203.00 - CA$203.00
CA$203.00
CA$186.00 - CA$186.00
CA$186.00
CA$186.00 - CA$186.00
CA$186.00

Farpoint D Series Dovetail Rings - 90mm

FAP-FDR90
Only 1 left!

Safely attach telescope optical accessories with Farpoint 90mm D Style Dovetail Rings.Includes two “D” Losmandy style 90mm I.D. Rings with 3 point ...

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CA$186.00 - CA$186.00
CA$186.00
CA$186.00 - CA$186.00
CA$186.00
CA$119.00 - CA$119.00
CA$119.00
CA$119.00 - CA$119.00
CA$119.00

Lunt Clamshell Mounting Rings - LS60THA or LS80THA

LSS-CLAM

Designed for Lunt LS60THa & LS80THa Telescopes Heavy-Duty Black-Anodized Construction Integrated 1/4-20 Tapped Mounting Hole Accepts Tele Vue ...

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CA$119.00 - CA$119.00
CA$119.00
CA$119.00 - CA$119.00
CA$119.00
Orion Optics UK 150mm Trunion rings and blocks to fit OOUK 6" telescopes
CA$160.00 - CA$160.00
CA$160.00
CA$160.00 - CA$160.00
CA$160.00

Orion Optics UK 150mm Trunion rings and blocks to fit OOUK 6" telescopes

OOUK-150MM-TRUNION-RINGS-BLOCKS-OOUK

Sized for 150mm Dobsonian mounts CNC machined in the UK Description Specifications In the Box Warranty Trunion Rings and Blocks -- OOUK 6...

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CA$160.00 - CA$160.00
CA$160.00
CA$160.00 - CA$160.00
CA$160.00
Orion Optics UK 150mm Trunion rings, spacers and blocks for 3rd party telescopes.
CA$208.00 - CA$208.00
CA$208.00
CA$208.00 - CA$208.00
CA$208.00

Orion Optics UK 150mm Trunion rings, spacers and blocks for 3rd party telescopes.

OOUK-150MM-TRUNION-RINGS-SPACERS-BLOCKS

Sized for 150mm Dobsonian mounts CNC machined in the UK Description Specifications In the Box Warranty 150mm Trunion Rings, Spacers and B...

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CA$208.00 - CA$208.00
CA$208.00
CA$208.00 - CA$208.00
CA$208.00
Orion Optics UK 200mm Trunion rings and blocks to fit OOUK 8" telescopes
CA$164.00 - CA$164.00
CA$164.00
CA$164.00 - CA$164.00
CA$164.00

Orion Optics UK 200mm Trunion rings and blocks to fit OOUK 8" telescopes

OOUK-200MM-TRUNION-RINGS-BLOCKS-OOUK

Sized for 200mm Dobsonian mounts CNC machined in the UK Description Specifications In the Box Warranty Trunion Rings and Blocks -- OOUK 8...

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CA$164.00 - CA$164.00
CA$164.00
CA$164.00 - CA$164.00
CA$164.00
Orion Optics UK 200mm Trunion rings, spacers and blocks for 3rd party telescopes.
CA$212.00 - CA$212.00
CA$212.00
CA$212.00 - CA$212.00
CA$212.00

Orion Optics UK 200mm Trunion rings, spacers and blocks for 3rd party telescopes.

OOUK-200MM-TRUNION-RINGS-SPACERS-BLOCKS

Sized for 200mm Dobsonian mounts CNC machined in the UK Description Specifications In the Box Warranty 200mm Trunion Rings, Spacers and B...

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CA$212.00 - CA$212.00
CA$212.00
CA$212.00 - CA$212.00
CA$212.00
Orion Optics UK 250mm Trunion rings and blocks to fit OOUK 10" telescopes
CA$177.00 - CA$177.00
CA$177.00
CA$177.00 - CA$177.00
CA$177.00

Orion Optics UK 250mm Trunion rings and blocks to fit OOUK 10" telescopes

OOUK-250MM-TRUNION-RINGS-BLOCKS-OOUK

Sized for 250mm Dobsonian mounts CNC machined in the UK Description Specifications In the Box Warranty Trunion Rings and Blocks -- OOUK 1...

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CA$177.00 - CA$177.00
CA$177.00
CA$177.00 - CA$177.00
CA$177.00
Orion Optics UK 250mm Trunion rings, spacers and blocks for 3rd party telescopes.
CA$225.00 - CA$225.00
CA$225.00
CA$225.00 - CA$225.00
CA$225.00

Orion Optics UK 250mm Trunion rings, spacers and blocks for 3rd party telescopes.

OOUK-250MM-TRUNION-RINGS-SPACERS-BLOCKS

Sized for 250mm Dobsonian mounts CNC machined in the UK Description Specifications In the Box Warranty 250mm Trunion Rings, Spacers and B...

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CA$225.00 - CA$225.00
CA$225.00
CA$225.00 - CA$225.00
CA$225.00
Orion Optics UK 300mm Trunion rings and blocks to fit OOUK 12" telescopes
CA$206.00 - CA$206.00
CA$206.00
CA$206.00 - CA$206.00
CA$206.00

Orion Optics UK 300mm Trunion rings and blocks to fit OOUK 12" telescopes

OOUK-300MM-TRUNION-RINGS-BLOCKS-OOUK

Sized for 300mm Dobsonian mounts CNC machined in the UK Description Specifications In the Box Warranty Trunion Rings and Blocks -- OOUK 1...

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CA$206.00 - CA$206.00
CA$206.00
CA$206.00 - CA$206.00
CA$206.00
Orion Optics UK 300mm Trunion rings, spacers and blocks for 3rd party telescopes.
CA$254.00 - CA$254.00
CA$254.00
CA$254.00 - CA$254.00
CA$254.00

Orion Optics UK 300mm Trunion rings, spacers and blocks for 3rd party telescopes.

OOUK-300MM-TRUNION-RINGS-SPACERS-BLOCKS

Sized for 300mm Dobsonian mounts CNC machined in the UK Description Specifications In the Box Warranty 300mm Trunion Rings, Spacers and B...

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CA$254.00 - CA$254.00
CA$254.00
CA$254.00 - CA$254.00
CA$254.00
Orion Optics UK 350mm Trunion rings and blocks to fit OOUK 14" telescopes
CA$214.00 - CA$214.00
CA$214.00
CA$214.00 - CA$214.00
CA$214.00

Orion Optics UK 350mm Trunion rings and blocks to fit OOUK 14" telescopes

OOUK-350MM-TRUNION-RINGS-BLOCKS-OOUK

Sized for 350mm Dobsonian mounts CNC machined in the UK Description Specifications In the Box Warranty Trunion Rings and Blocks -- OOUK 1...

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CA$214.00 - CA$214.00
CA$214.00
CA$214.00 - CA$214.00
CA$214.00
Orion Optics UK 350mm Trunion rings, spacers and blocks for 3rd party telescopes.
CA$301.00 - CA$301.00
CA$301.00
CA$301.00 - CA$301.00
CA$301.00

Orion Optics UK 350mm Trunion rings, spacers and blocks for 3rd party telescopes.

OOUK-350MM-TRUNION-RINGS-SPACERS-BLOCKS

Sized for 350mm Dobsonian mounts CNC machined in the UK Description Specifications In the Box Warranty 350mm Trunion Rings, Spacers and B...

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CA$301.00 - CA$301.00
CA$301.00
CA$301.00 - CA$301.00
CA$301.00
Orion Optics UK 400mm Trunion rings and blocks to fit OOUK 16" telescopes
CA$255.00 - CA$255.00
CA$255.00
CA$255.00 - CA$255.00
CA$255.00

Orion Optics UK 400mm Trunion rings and blocks to fit OOUK 16" telescopes

OOUK-400MM-TRUNION-RINGS-BLOCKS-OOUK

Sized for 400mm Dobsonian mounts CNC machined in the UK Description Specifications In the Box Warranty Trunion Rings and Blocks -- OOUK 1...

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CA$255.00 - CA$255.00
CA$255.00
CA$255.00 - CA$255.00
CA$255.00
Orion Optics UK 400mm Trunion rings, spacers and blocks for 3rd party telescopes.
CA$341.00 - CA$341.00
CA$341.00
CA$341.00 - CA$341.00
CA$341.00

Orion Optics UK 400mm Trunion rings, spacers and blocks for 3rd party telescopes.

OOUK-400MM-TRUNION-RINGS-SPACERS-BLOCKS

Sized for 400mm Dobsonian mounts CNC machined in the UK Description Specifications In the Box Warranty 400mm Trunion Rings, Spacers and B...

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CA$341.00 - CA$341.00
CA$341.00
CA$341.00 - CA$341.00
CA$341.00
CA$315.00 - CA$315.00
CA$315.00
CA$315.00 - CA$315.00
CA$315.00

PrimaLuceLab 100mm PLUS Support Rings

PLL-PLLANSU100P

Designed for 100mm Diameter Optical Tubes Part of the Modular PrimaLuceLab PLUS System Precision CNC-Machined from a Single Aluminum Block Hard An...

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CA$315.00 - CA$315.00
CA$315.00
CA$315.00 - CA$315.00
CA$315.00
CA$329.00 - CA$329.00
CA$329.00
CA$329.00 - CA$329.00
CA$329.00

PrimaLuceLab 105mm PLUS Support Rings

PLL-PLLANSU105P

105mm Internal Diameter Prima Luce Universal System (PLUS) Compatible High-Precision CNC-Machined Aluminum Construction Hard Anodized Finish for D...

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CA$329.00 - CA$329.00
CA$329.00
CA$329.00 - CA$329.00
CA$329.00
CA$343.00 - CA$343.00
CA$343.00
CA$343.00 - CA$343.00
CA$343.00

PrimaLuceLab 115mm PLUS Support Rings

PLL-PLLANSU115P

Designed for 115mm diameter optical tubes Part of the modular PrimaLuceLab PLUS system CNC-machined from a single block of aluminum Hard-anodized ...

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CA$343.00 - CA$343.00
CA$343.00
CA$343.00 - CA$343.00
CA$343.00
CA$357.00 - CA$357.00
CA$357.00
CA$357.00 - CA$357.00
CA$357.00

PrimaLuceLab 125mm PLUS Support Rings

PLL-PLLANSU125P

125mm Internal Diameter PrimaLuceLab PLUS System Integration CNC-Machined Aluminum Construction Hard-Anodized Finish Optimized for Takahashi FSQ10...

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CA$357.00 - CA$357.00
CA$357.00
CA$357.00 - CA$357.00
CA$357.00
CA$399.00 - CA$399.00
CA$399.00
CA$399.00 - CA$399.00
CA$399.00

PrimaLuceLab 131mm PLUS Support Rings

PLL-PLLANSU131P

Internal Diameter: 131mm Material: CNC-machined from a single block of aluminum System Compatibility: Part of the PrimaLuceLab PLUS modular system...

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CA$399.00 - CA$399.00
CA$399.00
CA$399.00 - CA$399.00
CA$399.00
CA$413.00 - CA$413.00
CA$413.00
CA$413.00 - CA$413.00
CA$413.00

PrimaLuceLab 134mm PLUS Support Rings

PLL-PLLANSU134P

Designed for 134mm Diameter Optical Tubes Part of the PrimaLuceLab PLUS Modular System CNC-Machined from a Solid Block of Aluminum Hard Anodized F...

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CA$413.00 - CA$413.00
CA$413.00
CA$413.00 - CA$413.00
CA$413.00
CA$427.00 - CA$427.00
CA$427.00
CA$427.00 - CA$427.00
CA$427.00

PrimaLuceLab 140mm PLUS Support Rings

PLL-PLLANSU140P

Securely holds optical tubes with a 140mm diameter CNC machined from a solid aluminum block for maximum rigidity Part of the modular PrimaLu...

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CA$427.00 - CA$427.00
CA$427.00
CA$427.00 - CA$427.00
CA$427.00
CA$441.00 - CA$441.00
CA$441.00
CA$441.00 - CA$441.00
CA$441.00

PrimaLuceLab 145mm PLUS Support Rings

PLL-PLLANSU145P

145mm Internal Diameter PrimaLuceLab PLUS System Integration CNC-Machined Aluminum Construction Hard Anodized Finish Universal Hole and Slot Patte...

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CA$441.00 - CA$441.00
CA$441.00
CA$441.00 - CA$441.00
CA$441.00
CA$455.00 - CA$455.00
CA$455.00
CA$455.00 - CA$455.00
CA$455.00

PrimaLuceLab 150mm PLUS Support Rings

PLL-PLLANSU150P

Fits 150mm Diameter Optical Tubes Precision CNC-Machined Aluminum Construction Part of the Modular PrimaLuceLab PLUS System Universal Hole and Slo...

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CA$455.00 - CA$455.00
CA$455.00
CA$455.00 - CA$455.00
CA$455.00

Sizing and Choosing Tube Rings

Rings are specified by inner diameter and should match the tube closely. Too large and the felt compresses unevenly; too small and they will not close.

  • Inner diameter, not aperture: An 80 mm refractor typically has a tube diameter around 90 mm, and dew shields are wider still. Measure the tube where the rings will sit.
  • Hinged versus split rings: Hinged rings allow a tube to be dropped in without removing the top half, which is considerably easier in the dark with cold hands.
  • Felt and liner material: A proper liner distributes clamping force and protects paint; a hard ring on a bare tube can dent thin aluminium.
  • Top accessory holes: Rings with threaded top holes accept a short rail for a guide scope or finder, keeping accessories close to the optical axis and reducing flexure.
  • Rotation for framing: Loosening rings to rotate the tube changes camera angle without breaking the imaging train, which preserves spacing.
  • Ring spacing on the bar: Rings placed further apart resist flexure better; too close together and a long tube can pivot under load.

Why Choose David Astro for Tube Rings

Ring fit is a measurement problem, and a wrong measurement is an expensive return.

  • Model-based sizing: Tell us the telescope model and we will look up the actual tube diameter rather than asking you to estimate it.
  • Balance planning: We advise on ring spacing and dovetail length together, since rings positioned to balance a heavy camera can end up too close for good rigidity.
  • Accessory mounting considered: If you intend to carry a guide scope, we recommend rings with usable top mounting rather than adding a bracket later.
  • Authorized dealer: Genuine hardware with full manufacturer warranty, held in our Canadian warehouse.
  • Ships from Canada: No duties or brokerage fees for Canadian buyers.

Tube Rings in Canada — Frequently Asked Questions

How do I measure for tube rings?
Measure the outer diameter of the tube itself at the point where the rings will clamp, not at the dew shield or the focuser end. If you can give us the telescope model we can usually confirm it directly.
Can rings be slightly oversized?
A few millimetres can be taken up with additional liner material, but a significant mismatch causes uneven clamping and can mark the tube. It is better to get the correct size.
How far apart should rings be?
As far as balance allows. Wider spacing resists flexure and rotation better. If a heavy camera forces the rings forward and close together, consider a longer dovetail instead.
Do I need rings if my telescope has a fixed dovetail?
Not necessarily, but rings add the ability to rotate the tube for framing and to mount accessories on top, which a fixed foot does not offer.

Need the right ring size?

Send us your telescope model and we will confirm the diameter. Canadian stock, fast domestic shipping.