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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$101.00 - CA$101.00
CA$101.00
CA$101.00 - CA$101.00
CA$101.00

Askar D-Series Universal Dovetail Plate - 200mm

ASK-ASLDP200R
3 in stock

Losmandy D-Series Profile Universal Hole and Slot Mounting Pattern Flexible Accessory Integration Solid, Flex-Free Connection Description FAQ S...

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CA$101.00 - CA$101.00
CA$101.00
CA$101.00 - CA$101.00
CA$101.00
CA$134.00 - CA$134.00
CA$134.00
CA$134.00 - CA$134.00
CA$134.00

Askar D-Series Universal Dovetail Plate - 300mm

ASK-ASLDP300R
2 in stock

300mm Overall Length Universal D-Series (Losmandy-style) Profile Slotted and Tapped Mounting Holes Designed for Tube Rings and Guide Scopes Provid...

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CA$134.00 - CA$134.00
CA$134.00
CA$134.00 - CA$134.00
CA$134.00
CA$178.00 - CA$178.00
CA$178.00
CA$178.00 - CA$178.00
CA$178.00

Askar D-Series Universal Dovetail Plate - 400mm

ASK-ASLDP400R
1 in stock

400mm Length D-Series (Losmandy-style) Profile Universal Hole and Slot Pattern Connects Tube Rings and Accessories Solid, Flex-Free Mounting Platf...

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CA$178.00 - CA$178.00
CA$178.00
CA$178.00 - CA$178.00
CA$178.00
CA$83.00 - CA$83.00
CA$83.00
CA$83.00 - CA$83.00
CA$83.00

Askar SQA55 Quick-Release Handle Bar

ASK-ASKSHAN55

Designed specifically for the Askar SQA55 Astrograph Tool-free quick-release installation and removal Integrated multi-functional finder base slot...

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CA$83.00 - CA$83.00
CA$83.00
CA$83.00 - CA$83.00
CA$83.00
CA$57.00 - CA$57.00
CA$57.00
CA$57.00 - CA$57.00
CA$57.00

Askar V-Series Universal Dovetail Plate - 150mm

ASK-ASVDP150R
1 in stock

150mm Length V-Series (Vixen-Style) Profile Universal Mounting Slots and Holes Connects Tube Rings, Guide Scopes, or Cameras Description FAQ Sp...

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CA$57.00 - CA$57.00
CA$57.00
CA$57.00 - CA$57.00
CA$57.00
CA$66.00 - CA$66.00
CA$66.00
CA$66.00 - CA$66.00
CA$66.00

Askar V-Series Universal Dovetail Plate - 200mm

ASK-ASVDP200R
3 in stock

200mm Length V-Series (Vixen-style) Profile Universal Hole and Slot Pattern Mounts Tube Rings, Guide Rings, and Cameras Tripod Compatible Descr...

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CA$66.00 - CA$66.00
CA$66.00
CA$66.00 - CA$66.00
CA$66.00
CA$83.00 - CA$83.00
CA$83.00
CA$83.00 - CA$83.00
CA$83.00

Askar V-Series Universal Dovetail Plate - 300mm

ASK-ASVDP300R
1 in stock

300mm Vixen-Style Dovetail Plate Universal Mounting Slots and Holes Ideal for Telescope Tube Rings and Guide Scopes Lightweight and Rigid Construc...

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CA$83.00 - CA$83.00
CA$83.00
CA$83.00 - CA$83.00
CA$83.00
CA$47.00 - CA$47.00
CA$47.00
CA$47.00 - CA$47.00
CA$47.00

Baader 3" 60mm Losmandy Rider Clamp

BAA-2451575

Fits standard 3-inch Losmandy D-style dovetail bars Provides a 60mm wide mounting platform Securely holds heavy accessories like guide scopes and ...

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CA$47.00 - CA$47.00
CA$47.00
CA$47.00 - CA$47.00
CA$47.00
CA$503.00 - CA$503.00
CA$503.00
CA$503.00 - CA$503.00
CA$503.00

Baader Stronghold Tangent Mount Assembly - Black

BAA-2450310S

Precision tangent arm assembly for fine pointing adjustments Designed for securely mounting finders, guidescopes, and telephoto lenses Engineered ...

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CA$503.00 - CA$503.00
CA$503.00
CA$503.00 - CA$503.00
CA$503.00
CA$117.00 - CA$117.00
CA$117.00
CA$117.00 - CA$117.00
CA$117.00

Baader D-Series 1kg Leveling Counterweight & 3" Riderclamp

BAA-2451576

1 kg sliding counterweight for fine balance adjustments Integrated 3" D-Series (Losmandy-style) dovetail clamp Ideal for correcting imbalance from...

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CA$117.00 - CA$117.00
CA$117.00
CA$117.00 - CA$117.00
CA$117.00
CA$178.00 - CA$178.00
CA$178.00
CA$178.00 - CA$178.00
CA$178.00

Baader D-Series Double Dovetail Mounting Plate - 300mm

BAA-1500330

300mm Mounting Plate Length Dual-Sided 3-Inch D-Style Dovetail Predrilled for 10Micron and Astro-Physics Mounts Compatible with Baader Guidescope ...

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CA$178.00 - CA$178.00
CA$178.00
CA$178.00 - CA$178.00
CA$178.00
CA$379.00 - CA$379.00
CA$379.00
CA$379.00 - CA$379.00
CA$379.00

Baader DV-Series PAN/EQ Dual Doverail Saddle - 230mm

BAA-2451566

Accepts both 3" Losmandy and Vixen/EQ style dovetails 230mm overall length for enhanced stability Dual two-stage brass clamping blocks prevent mar...

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CA$379.00 - CA$379.00
CA$379.00
CA$379.00 - CA$379.00
CA$379.00
CA$459.00 - CA$459.00
CA$459.00
CA$459.00 - CA$459.00
CA$459.00

Baader DV-Series PAN/EQ Dual Doverail Saddle - 370mm

BAA-2451565

Accommodates both 3" Losmandy D-style and Vixen V-style dovetail bars Extended length improves balance and acts as a functional counterweight Feat...

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CA$459.00 - CA$459.00
CA$459.00
CA$459.00 - CA$459.00
CA$459.00
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$1,063.00 - CA$1,063.00
CA$1,063.00
CA$1,063.00 - CA$1,063.00
CA$1,063.00

Baader Heavy-Duty 8" Planewave Double Mounting Plate - for up to 100kg

BAA-2451559

Designed for parallel mounting of two large telescopes Enables precise balancing of off-center loads Pre-drilled for versatile clamp and accessory...

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CA$1,063.00 - CA$1,063.00
CA$1,063.00
CA$1,063.00 - CA$1,063.00
CA$1,063.00
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 Baader 3" Losmandy Dovetail Bar - 250mm (10")
CA$114.00 - CA$114.00
CA$114.00
CA$114.00 - CA$114.00
CA$114.00

Baader Planetarium 3" Losmandy Dovetail Bar - 250mm (10")

BAA-1501605

3" Losmandy D-Style Profile 250mm (10") Length Ideal for Custom Telescope Builds Black Anodized Finish Description FAQ Specifications In the Bo...

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CA$114.00 - CA$114.00
CA$114.00
CA$114.00 - CA$114.00
CA$114.00
Baader Planetarium Dovetail Bar 3", 190mm (7.5") – for Baader & TEC (flat)
CA$139.00 - CA$139.00
CA$139.00
CA$139.00 - CA$139.00
CA$139.00

Baader Planetarium Dovetail Bar 3", 190mm (7.5") – for Baader & TEC (flat)

BAA-1501655

3" Losmandy D-Style Dovetail Bar 190mm (7.5") Length Flat Top Profile for Flat-Surface Mounting Compatible with Baader 3" Clamps and TEC Telescope...

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CA$139.00 - CA$139.00
CA$139.00
CA$139.00 - CA$139.00
CA$139.00
Baader Planetarium Dovetail Bar 3", 230mm (9") – for Baader & TEC (flat)
CA$148.00 - CA$148.00
CA$148.00
CA$148.00 - CA$148.00
CA$148.00

Baader Planetarium Dovetail Bar 3", 230mm (9") – for Baader & TEC (flat)

BAA-1501660

3-inch Losmandy D-style dovetail profile 230mm (9") overall length Flat top surface for direct mounting Compatible with Baader 3" clamps Ideal for...

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CA$148.00 - CA$148.00
CA$148.00
CA$148.00 - CA$148.00
CA$148.00
Baader Planetarium Dovetail Bar 3", 350mm (14") – for Custom builds
CA$129.00 - CA$129.00
CA$129.00
CA$129.00 - CA$129.00
CA$129.00

Baader Planetarium Dovetail Bar 3", 350mm (14") – for Custom builds

BAA-1501610

3-inch Losmandy D-Style Dovetail Bar 350mm (14") Overall Length Ideal for Custom Telescope Mounting Solutions Durable Black Anodized Finish Des...

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CA$129.00 - CA$129.00
CA$129.00
CA$129.00 - CA$129.00
CA$129.00
Baader Planetarium Dovetail Bar 3", 470mm (18.5") – for Celestron / Custom builds
CA$158.00 - CA$158.00
CA$158.00
CA$158.00 - CA$158.00
CA$158.00

Baader Planetarium Dovetail Bar 3", 470mm (18.5") – for Celestron / Custom builds

BAA-1501615

3-inch Losmandy-style dovetail profile 470mm (18.5") overall length for optimal balance Provides a rigid mounting platform for large telescopes Du...

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CA$158.00 - CA$158.00
CA$158.00
CA$158.00 - CA$158.00
CA$158.00
Baader Planetarium Dovetail Bar 3", 530mm (20.5") – for Celestron / Custom builds
CA$188.00 - CA$188.00
CA$188.00
CA$188.00 - CA$188.00
CA$188.00

Baader Planetarium Dovetail Bar 3", 530mm (20.5") – for Celestron / Custom builds

BAA-1501620

530mm (20.5") Length 3" Losmandy D-Style Standard Ideal for Celestron SCTs and Custom Builds Black Anodized Finish Description FAQ Specificatio...

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CA$188.00 - CA$188.00
CA$188.00
CA$188.00 - CA$188.00
CA$188.00

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.