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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$209.00 - CA$209.00
CA$209.00
CA$209.00 - CA$209.00
CA$209.00

Baader Guide Scope Rings BP I - 60-120mm

BAA-1500201

Accommodates Tube Diameters: 60mm to 120mm Ring Width: 28mm Adjustment Screws: Three M10 with Non-Rotating Ball-Bearing Tips Material: Solid Turne...

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CA$209.00 - CA$209.00
CA$209.00
CA$209.00 - CA$209.00
CA$209.00
CA$271.00 - CA$271.00
CA$271.00
CA$271.00 - CA$271.00
CA$271.00

Baader Guide Scope Rings BP II - 110-160mm

BAA-1500202

Accommodates Tube Diameters from 110mm to 160mm Massive 28mm Ring Width for High Rigidity Three M10 Adjustment Screws Per Ring 10mm Non-Rotating, ...

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CA$271.00 - CA$271.00
CA$271.00
CA$271.00 - CA$271.00
CA$271.00
CA$140.00 - CA$140.00
CA$140.00
CA$140.00 - CA$140.00
CA$140.00

Baader Multipurpose Finder Bracket MQR III 7x50 (max 62mm)

BAA-2457020

CNC Milled Construction for Rigidity Quick-Release Dovetail for Repeatable Alignment Modular Design Adapts to Finderscopes or Red-Dot Sights Fits ...

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CA$140.00 - CA$140.00
CA$140.00
CA$140.00 - CA$140.00
CA$140.00
CA$149.00 - CA$149.00
CA$149.00
CA$149.00 - CA$149.00
CA$149.00

Baader Multipurpose Finder Bracket MQR IV 7x50 (max 72mm)

BAA-2457030

Accommodates finder scopes up to 72mm in diameter CNC-milled quick-release dovetail for precise return-to-zero alignment Modular design allows for...

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CA$149.00 - CA$149.00
CA$149.00
CA$149.00 - CA$149.00
CA$149.00
Baader Planetarium Guidescope Rings (1 pair) – Size III, 140-185mm
CA$392.00 - CA$392.00
CA$392.00
CA$392.00 - CA$392.00
CA$392.00

Baader Planetarium Guidescope Rings (1 pair) – Size III, 140-185mm

BAA-1500203

Designed for Tube Diameters from 140-185mm Solid, Turned Aluminum Construction Non-Rotating, Non-Marring V2A Steel Tips Ball-Bearing Adjustment Me...

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CA$392.00 - CA$392.00
CA$392.00
CA$392.00 - CA$392.00
CA$392.00
Baader Planetarium Guidescope Rings (1 pair) – Size IV, 140-185mm
CA$947.00 - CA$947.00
CA$947.00
CA$947.00 - CA$947.00
CA$947.00

Baader Planetarium Guidescope Rings (1 pair) – Size IV, 175-265mm

BAA-1500204

Size IV Guidescope Rings (Pair) Non-Rotating, Non-Marring Adjustment Screws Ball-Bearing V2A Steel Screw Tips Integrated Accessory Mounting Points...

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CA$947.00 - CA$947.00
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CA$13.00 - CA$13.00
CA$13.00
CA$13.00 - CA$13.00
CA$13.00

Baader Sky Surfer III Adapter for Binoculars

BAA-2957305
1 in stock

Adapts Baader Sky Surfer III to Binoculars Mounts to Standard 1/4"-20 Tripod Sockets Enables Intuitive "Both-Eyes-Open" Targeting Ideal for High-M...

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CA$13.00 - CA$13.00
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CA$12.00 - CA$12.00
CA$12.00
CA$12.00 - CA$12.00
CA$12.00

Baader Sky Surfer III Adapter for Spotting Scopes

BAA-2957306

Adapts Baader Sky Surfer III to Spotting Scopes Enables Fast, Intuitive Target Acquisition Ideal for Terrestrial and Astronomical Use ...

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CA$12.00 - CA$12.00
CA$12.00
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CA$12.00
CA$50.00 - CA$50.00
CA$50.00
CA$50.00 - CA$50.00
CA$50.00

Baader Standard Dovetail Finder Base

BAA-2457000
1 in stock

Machined from a solid block of aluminum for zero flexure Sinusoidal base provides two linear contact points for stability Universal design fits a ...

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CA$50.00 - CA$50.00
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CA$17.00 - CA$17.00
CA$17.00
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CA$17.00

David Astro Finder Base

DAV-FS-SHOE

CA$17.00 - CA$17.00
CA$17.00
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CA$17.00
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CA$39.00 - CA$39.00
CA$39.00
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CA$39.00

David Astro Triple Finder Base

DAV-TRIPLE-SHOE
Only 3 left!

CA$39.00 - CA$39.00
CA$39.00
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CA$39.00
CA$83.99 - CA$83.99
CA$83.99
CA$83.99 - CA$83.99
CA$83.99

Explore Scientific 50mm Finder Scope Rings - Standard Height

ES-FNDRRGSSTD

Designed for 50mm finder scopes Standard height profile at 93mm Lightweight at only 3.9oz (110.6g) Three-point adjustment thumbscrews for precise ...

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CA$83.99 - CA$83.99
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CA$125.99 - CA$125.99
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CA$125.99

Explore Scientific 50mm Finder Scope Rings - Tall

ES-FNDRRGSTALL

Designed for 50mm Finderscopes Tall Profile for Comfortable Viewing Angles Quick-Release Dovetail Bracket Multi-Point Adjustment Rings Large, Glov...

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CA$125.99 - CA$125.99
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CA$111.99 - CA$111.99
CA$111.99
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CA$111.99

Explore Scientific 50mm Finder Scope Rings for Right Angle Finder

ES-FNDRRGSRA

Designed for 50mm Aperture Finder Scopes Dual-Ring Bracket with 6 Collimation Points Quick-Release Dovetail Foot (Base Sold Separately) Large, Glo...

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CA$111.99 - CA$111.99
CA$111.99
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CA$111.99
Explore Scientific Cradle for David Levy Comet Hunter and TED152mm Telescope
CA$182.00 - CA$182.00
CA$182.00
CA$182.00 - CA$182.00
CA$182.00

Explore Scientific Cradle for David Levy Comet Hunter and TED152mm Telescope

ES-MN06048CFCRDL

Custom Fit for David Levy Comet Hunter & TED152mm Telescopes Hinged Ring Design with Oversized Thumbscrews Integrated Carry Handle with Access...

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CA$182.00 - CA$182.00
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CA$125.99 - CA$125.99
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Explore Scientific Cradle for White 127mm

ES-TED127CRDL

Inside Diameter: 5.2" (131mm) for a precise fit Dovetail Length: 8" (203mm) for stable mounting Compatibility: Explore Scientific White 127mm T...

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CA$125.99 - CA$125.99
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CA$69.99 - CA$69.99
CA$69.99
CA$69.99 - CA$69.99
CA$69.99

Explore Scientific Finder Scope Base with Mounting Screws

ES-FNDRBASEBLK

Weight: 1.4oz Dimensions: 50mm L x 51mm W x 25mm H Provides a secure base for Explore Scientific finder scopes Includes mounting screws for instal...

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CA$69.99 - CA$69.99
CA$69.99
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CA$69.99
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CA$69.99

Explore Scientific T-Shaped Finder Scope Base for Essential Series with Mounting Screws

ES-FNDRBASE-ESSEN

T-Shaped Finder Scope Base Designed for Explore Scientific Essential Series Telescopes Compatible with all Explore Scientific Finder Scopes Create...

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CA$69.99 - CA$69.99
CA$69.99
CA$69.99 - CA$69.99
CA$69.99
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
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

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.