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Mounting Hardware

Flexure is invisible until you see it in your stars. A dovetail that shifts a fraction of a millimetre under load, a guide scope on a soft bracket, a saddle clamping on one point instead of a face — each produces elongation that no processing corrects. David Astro carries mounting hardware items in Canada: dovetail bars and clamps, tube rings, saddles, side-by-side plates and adapter plates, in Canadian stock.

Getting this right is mostly a matter of matching standards and eliminating single points of contact. Tell us your tube diameter, mount saddle and payload and we will specify hardware that holds it rigidly.

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CA$69.00 - CA$69.00
CA$69.00
CA$69.00 - CA$69.00
CA$69.00

PrimaLuceLab Losmandy Plate 140mm PLUS

PLL-PLLLOS140P
2 in stock

Compact Form Factor Losmandy D-Style Profile PrimaLuceLab PLUS System Integration CNC-Machined Aluminum Construction Hard Anodized Finish for Dura...

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CA$69.00 - CA$69.00
CA$69.00
CA$69.00 - CA$69.00
CA$69.00
CA$104.00 - CA$104.00
CA$104.00
CA$104.00 - CA$104.00
CA$104.00

PrimaLuceLab Losmandy Plate 240mm PLUS

PLL-PLLLOS240P
1 in stock

240mm Losmandy-style dovetail plate Part of the modular PrimaLuceLab PLUS system CNC machined from a single block of aluminum for maximum rigidity...

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CA$104.00 - CA$104.00
CA$104.00
CA$104.00 - CA$104.00
CA$104.00
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CA$104.00
CA$104.00 - CA$104.00
CA$104.00
CA$94.00
CA$94.00 - CA$94.00
CA$94.00

PrimaLuceLab Losmandy Plate 240mm PLUS - Open Box

U-PLL-PLLLOS240P
1 in stock

The Losmandy style dovetail plate 240mm PLUS is designed to let you install your telescopes on mounts with this plate. This dovetail plate is 240mm...

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CA$104.00
CA$104.00 - CA$104.00
CA$104.00
CA$94.00
CA$94.00 - CA$94.00
CA$94.00
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CA$125.00 - CA$125.00
CA$125.00
CA$125.00 - CA$125.00
CA$125.00

PrimaLuceLab Losmandy Plate 350mm PLUS

PLL-PLLLOS350P
2 in stock

350mm Losmandy-Style Dovetail Plate Part of the Modular PrimaLuceLab PLUS System CNC Machined from a Single Aluminum Block Multiple Threaded Holes...

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CA$125.00 - CA$125.00
CA$125.00
CA$125.00 - CA$125.00
CA$125.00
CA$153.00 - CA$153.00
CA$153.00
CA$153.00 - CA$153.00
CA$153.00

PrimaLuceLab Losmandy Plate 495mm PLUS

PLL-PLLLOS495P
2 in stock

495mm length provides extensive support for large optical tubes Losmandy-style dovetail compatible with mounts like the SkyWatcher AZ-EQ6 and EQ8 ...

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CA$153.00 - CA$153.00
CA$153.00
CA$153.00 - CA$153.00
CA$153.00
CA$343.00 - CA$343.00
CA$343.00
CA$343.00 - CA$343.00
CA$343.00

PrimaLuceLab Losmandy Plate 915mm PLUS

PLL-PLLLOS915P

915mm Losmandy-style dovetail plate Supports optical tubes up to 30 kg 13mm thick CNC-machined aluminum construction Weighs 2.3 kg Part of the mod...

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CA$343.00 - CA$343.00
CA$343.00
CA$343.00 - CA$343.00
CA$343.00
PrimaLuceLab Losmandy Style Dovetail Plate 1100mm PLUS
CA$455.00 - CA$455.00
CA$455.00
CA$455.00 - CA$455.00
CA$455.00

PrimaLuceLab Losmandy Style Dovetail Plate 1100mm PLUS

PLLLOS1100P

1100mm full length for mounting large optical tubes 13mm thickness prevents flexure under heavy loads Supports optical tubes up to 30 kg Weighs 3....

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CA$455.00 - CA$455.00
CA$455.00
CA$455.00 - CA$455.00
CA$455.00
PrimaLuceLab Losmandy style dovetail plate 645mm PLUS
CA$223.00 - CA$223.00
CA$223.00
CA$223.00 - CA$223.00
CA$223.00

PrimaLuceLab Losmandy style dovetail plate 645mm PLUS

PLLLOS645P

645mm Losmandy-Style Dovetail Plate Part of the PrimaLuceLab PLUS Modular System CNC Machined from a Solid Aluminum Block Hard-Anodized Finish for...

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CA$223.00 - CA$223.00
CA$223.00
CA$223.00 - CA$223.00
CA$223.00
CA$277.00 - CA$277.00
CA$277.00
CA$277.00 - CA$277.00
CA$277.00

PrimaLuceLab Maxi Dovetail Clamp Vixen+Losmandy PLUS

PLL-PLLMORVLPM
3 in stock

Dual-saddle design accepts both Vixen and Losmandy-style dovetail plates CNC-machined from a solid block of aluminum for maximum rigidity Hard-ano...

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CA$277.00 - CA$277.00
CA$277.00
CA$277.00 - CA$277.00
CA$277.00
PrimaLuceLab Observatory Dovetail Clamp Vixen+Losmandy PLUS
CA$553.00 - CA$553.00
CA$553.00
CA$553.00 - CA$553.00
CA$553.00

PrimaLuceLab Observatory Dovetail Clamp Vixen+Losmandy PLUS

PLLMORVLPO

Supports both Vixen and Losmandy-style dovetail bars Designed for heavy telescope payloads Multiple locking blocks for secure, rigid attachment Fu...

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CA$553.00 - CA$553.00
CA$553.00
CA$553.00 - CA$553.00
CA$553.00
CA$41.00 - CA$41.00
CA$41.00
CA$41.00 - CA$41.00
CA$41.00

PrimaLuceLab PLUS 10mm Spacers

PLL-PLLSPES10
1 in stock

Adds 10mm of separation between PLUS system components Prevents collisions between parallel telescopes, cameras, and focusers Maintains PLUS syste...

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CA$41.00 - CA$41.00
CA$41.00
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CA$41.00
CA$55.00 - CA$55.00
CA$55.00
CA$55.00 - CA$55.00
CA$55.00

PrimaLuceLab PLUS 20mm Spacers

PLL-PLLSPES20
1 in stock

Adds 20mm of separation between components Prevents collisions between parallel-mounted scopes Compatible with PrimaLuceLab PLUS System Pre-drille...

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CA$55.00 - CA$55.00
CA$55.00
CA$55.00 - CA$55.00
CA$55.00
CA$63.00 - CA$63.00
CA$63.00
CA$63.00 - CA$63.00
CA$63.00

PrimaLuceLab PLUS 30mm Spacers

PLL-PLLSPES30
1 in stock

Creates a rigid 30mm standoff between components Prevents interference between main scope, guide scope, and accessories Maintains PLUS system comp...

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CA$63.00 - CA$63.00
CA$63.00
CA$63.00 - CA$63.00
CA$63.00
CA$97.00 - CA$97.00
CA$97.00
CA$97.00 - CA$97.00
CA$97.00

PrimaLuceLab PLUS Curved Blocks for Celestron C8, C9.25, C11, EdgeHD 800, 925, 1100 or Meade SC and ACF 8"

PLL-PLLSAG925
1 in stock

Provides a secure mounting base for Losmandy-style dovetail plates Precisely curved to match Celestron C8, C9.25, C11, and EdgeHD tubes Compatible...

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CA$97.00 - CA$97.00
CA$97.00
CA$97.00 - CA$97.00
CA$97.00
PrimaLuceLab Side by side Losmandy plate 240mm PLUS
CA$294.00 - CA$294.00
CA$294.00
CA$294.00 - CA$294.00
CA$294.00

PrimaLuceLab Side by side Losmandy plate 240mm PLUS

PLLPDLOS240P

Losmandy-Style Side-by-Side Plate Mounts Two Telescopes in Parallel Dual Vixen and Losmandy Compatible Saddles CNC-Machined Aluminum Construction ...

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CA$294.00 - CA$294.00
CA$294.00
CA$294.00 - CA$294.00
CA$294.00
PrimaLuceLab Side by side Losmandy plate 240mm PLUS large dovetail clamps
CA$510.00 - CA$510.00
CA$510.00
CA$510.00 - CA$510.00
CA$510.00

PrimaLuceLab Side by side Losmandy plate 240mm PLUS large dovetail clamps

PLLPDLOS240PL

Mounts two telescopes in parallel on a single mount Main bar features a Losmandy-style dovetail for mount connection Dual clamps accept both Vixen...

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CA$510.00 - CA$510.00
CA$510.00
CA$510.00 - CA$510.00
CA$510.00
PrimaLuceLab Side by side Losmandy plate 350mm PLUS
CA$315.00 - CA$315.00
CA$315.00
CA$315.00 - CA$315.00
CA$315.00

PrimaLuceLab Side by side Losmandy plate 350mm PLUS

PLLPDLOS350P

Mounts Two Telescopes in Parallel Dual Saddles Accept Vixen & Losmandy Plates Attaches to any Losmandy-Style Mount Saddle Part of the PrimaLuc...

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CA$315.00 - CA$315.00
CA$315.00
CA$315.00 - CA$315.00
CA$315.00
PrimaLuceLab Side by side Losmandy plate 350mm PLUS large dovetail clamps
CA$531.00 - CA$531.00
CA$531.00
CA$531.00 - CA$531.00
CA$531.00

PrimaLuceLab Side by side Losmandy plate 350mm PLUS large dovetail clamps

PLLPDLOS350PL

350mm Side-by-Side Mounting Platform Mounts Two Optical Systems in Parallel Dual Clamps Accept Vixen & Losmandy Dovetails Attaches to Losmandy...

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CA$531.00 - CA$531.00
CA$531.00
CA$531.00 - CA$531.00
CA$531.00
PrimaLuceLab Side by side Losmandy plate 495mm PLUS maxi dovetail clamps
CA$707.00 - CA$707.00
CA$707.00
CA$707.00 - CA$707.00
CA$707.00

PrimaLuceLab Side by side Losmandy plate 495mm PLUS maxi dovetail clamps

PLLPDLOS495PM

495mm total length for ample instrument spacing Mounts two telescopes or instruments side-by-side Two maxi dovetail clamps accept both Vixen and L...

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CA$707.00 - CA$707.00
CA$707.00
CA$707.00 - CA$707.00
CA$707.00
PrimaLuceLab Side by side Vixen plate 240mm PLUS
CA$273.00 - CA$273.00
CA$273.00
CA$273.00 - CA$273.00
CA$273.00

PrimaLuceLab Side by side Vixen plate 240mm PLUS

PLLPDVIX240P

Mount two telescopes in parallel on a single mount 240mm total length Vixen-style main bar 202mm center-to-center saddle spacing Dual saddles acce...

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CA$273.00 - CA$273.00
CA$273.00
CA$273.00 - CA$273.00
CA$273.00
PrimaLuceLab Side by side Vixen plate 350mm PLUS
CA$301.00 - CA$301.00
CA$301.00
CA$301.00 - CA$301.00
CA$301.00

PrimaLuceLab Side by side Vixen plate 350mm PLUS

PLLPDVIX350P

350mm total length for mounting two optical tubes Mounts to any Vixen-style saddle plate Dual clamps accept both Vixen and Losmandy dovetails 310m...

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CA$301.00 - CA$301.00
CA$301.00
CA$301.00 - CA$301.00
CA$301.00
CA$55.00 - CA$55.00
CA$55.00
CA$55.00 - CA$55.00
CA$55.00

PrimaLuceLab Vixen Plate 140mm PLUS

PLL-PLLVIX140P
1 in stock

140mm Vixen-style dovetail plate Compatible with both Vixen and Arca-Swiss style clamps Integrates with the modular PrimaLuceLab PLUS system CNC-m...

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CA$55.00 - CA$55.00
CA$55.00
CA$55.00 - CA$55.00
CA$55.00
CA$83.00 - CA$83.00
CA$83.00
CA$83.00 - CA$83.00
CA$83.00

PrimaLuceLab Vixen Plate 240mm PLUS

PLL-PLLVIX240P
1 in stock

240mm Vixen-style Dovetail Plate Compatible with Arca-Swiss style clamps CNC Machined from a solid block of aluminum Part of the PrimaLuceLab PLUS...

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CA$83.00 - CA$83.00
CA$83.00
CA$83.00 - CA$83.00
CA$83.00
CA$111.00 - CA$111.00
CA$111.00
CA$111.00 - CA$111.00
CA$111.00

PrimaLuceLab Vixen Plate 350mm PLUS

PLL-PLLVIX350P

350mm Vixen-Style Dovetail Plate PLUS (Prima Luce Universal System) Integration Compatible with Arca-Swiss Clamps CNC-Machined Aluminum Constructi...

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CA$111.00 - CA$111.00
CA$111.00
CA$111.00 - CA$111.00
CA$111.00

Dovetail Standards and Building a Rigid Connection

Nearly all mounting hardware follows one of two dovetail standards, and mixing them without the correct clamp is the most common cause of a telescope sitting loose on an otherwise good mount.

  • Vixen-style dovetail (approximately 44 mm): The lighter standard, fine for small refractors and visual loads up to a few kilograms.
  • Losmandy-style dovetail (approximately 75 mm): The wider, stiffer standard used for heavier optics and imaging trains where flexure must be minimized.
  • Tube rings: Sized to the tube's outer diameter and lined to protect it; rings allow rotation for framing without unbolting the optic.
  • Mount saddles: The receiving clamp on the mount head. Dual-fit saddles accept both standards, and face-clamping designs grip more securely than a single point screw.
  • Side-by-side plates: Carry two optical tubes on one mount with balance adjustment in both axes.
  • Adapter plates: Convert between standards, add accessory mounting points, or raise a guide scope clear of an obstruction.

Why Choose David Astro for Mounting Hardware

Rigidity is cumulative. Every joint between the optic and the mount either holds or contributes to the error you spend the night chasing.

  • Standard matching: We confirm your mount's saddle type and specify a dovetail that fits it fully, rather than one that seats on an edge.
  • Flexure diagnosis: If your guiding shows drift that guiding corrections cannot fix, we will look at the mechanical chain with you — usually it is a guide scope bracket or an undersized dovetail.
  • Tube diameter fitting: Rings are matched to actual measured outer diameter, since nominal aperture and tube diameter are not the same number.
  • Authorized dealer: Genuine hardware with full manufacturer warranty, shipped from Canadian stock.
  • No cross-border fees: Canadian orders ship domestically with no duties or brokerage charges.

Mounting Hardware in Canada — Frequently Asked Questions

Vixen or Losmandy dovetail?
Losmandy for anything above roughly 7 kg or for imaging where flexure matters. Vixen is adequate for smaller refractors and visual use, and is lighter and more common on entry-level mounts.
Can I put a Vixen bar in a Losmandy saddle?
Only with a dual-fit saddle or an adapter clamp. Forcing a narrow bar into a wide clamp results in point contact, which is exactly the condition that causes slipping under load.
Why do my stars elongate only on one side of a meridian flip?
That pattern usually indicates differential flexure rather than tracking error. Check the guide scope bracket, the dovetail seating and the focuser drawtube, in that order.
How do I size tube rings?
By the tube's outer diameter, not aperture. Measure the tube itself, or tell us the exact telescope model and we will confirm the correct ring size.

Chasing flexure?

Tell us your tube, mount and payload and we will specify hardware that holds it solid. Ships from Canada with expert support.