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IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.

Dovetail Plates

A dovetail plate is the single mechanical link between your telescope and everything holding it up, and its stiffness sets the floor for how well your system can guide. David Astro stocks dovetail plates in Canada in both Vixen and Losmandy standards, in lengths from short accessory bars to full-length observatory plates, shipping from Canadian stock.

Choosing correctly is mostly about matching the standard to your mount's saddle and the length to your balance range. Tell us your mount and tube and we will specify the bar.

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Orion Optics UK Losmandy Dovetail 350mm long
$266.88 - $266.88
$266.88
$266.88 - $266.88
$266.88

Orion Optics UK Losmandy Dovetail 350mm long

OOUK-LOSMANDY-DOVETAIL-350MM

350mm length Fits Losmandy-standard mounts CNC machined in the UK Description Specifications In the Box Warranty 350mm Losmandy Dovetail ...

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$266.88 - $266.88
$266.88
$266.88 - $266.88
$266.88
Orion Optics UK Losmandy dovetail plate 585mm long used on VX20
$318.66 - $318.66
$318.66
$318.66 - $318.66
$318.66

Orion Optics UK Losmandy dovetail plate 585mm long used on VX20

OOUK-LOSMANDY-DOVETAIL-PLATE-585MM-USED

585mm length Fits Losmandy-standard mounts CNC machined in the UK Description Specifications In the Box Warranty 585mm Losmandy Dovetail ...

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$318.66 - $318.66
$318.66
$318.66 - $318.66
$318.66
$49.00 - $49.00
$49.00
$49.00 - $49.00
$49.00

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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$49.00 - $49.00
$49.00
$49.00 - $49.00
$49.00
$74.00 - $74.00
$74.00
$74.00 - $74.00
$74.00

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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$74.00 - $74.00
$74.00
$74.00 - $74.00
$74.00
Save 10% Save %
$73.75
$73.75 - $73.75
$73.75
$66.66
$66.66 - $66.66
$66.66

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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$73.75
$73.75 - $73.75
$73.75
$66.66
$66.66 - $66.66
$66.66
Save 10% Save %
$89.00 - $89.00
$89.00
$89.00 - $89.00
$89.00

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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$89.00 - $89.00
$89.00
$89.00 - $89.00
$89.00
$109.00 - $109.00
$109.00
$109.00 - $109.00
$109.00

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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$109.00 - $109.00
$109.00
$109.00 - $109.00
$109.00
$245.00 - $245.00
$245.00
$245.00 - $245.00
$245.00

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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$245.00 - $245.00
$245.00
$245.00 - $245.00
$245.00
PrimaLuceLab Losmandy Style Dovetail Plate 1100mm PLUS
$325.00 - $325.00
$325.00
$325.00 - $325.00
$325.00

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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$325.00 - $325.00
$325.00
$325.00 - $325.00
$325.00
PrimaLuceLab Losmandy style dovetail plate 645mm PLUS
$159.00 - $159.00
$159.00
$159.00 - $159.00
$159.00

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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$159.00 - $159.00
$159.00
$159.00 - $159.00
$159.00
$39.00 - $39.00
$39.00
$39.00 - $39.00
$39.00

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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$39.00 - $39.00
$39.00
$39.00 - $39.00
$39.00
$59.00 - $59.00
$59.00
$59.00 - $59.00
$59.00

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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$59.00 - $59.00
$59.00
$59.00 - $59.00
$59.00
$79.00 - $79.00
$79.00
$79.00 - $79.00
$79.00

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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$79.00 - $79.00
$79.00
$79.00 - $79.00
$79.00
$34.00 - $34.00
$34.00
$34.00 - $34.00
$34.00

PrimaLuceLab Vixen Plate 90mm PLUS

PLL-PLLVIX90P
1 in stock

90mm Vixen-style dovetail plate Dual-profile for Vixen and Arca-Swiss style clamps Part of the PrimaLuceLab PLUS modular system CNC machined from ...

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$34.00 - $34.00
$34.00
$34.00 - $34.00
$34.00
$60.00 - $60.00
$60.00
$60.00 - $60.00
$60.00

Sky-Watcher D-Series 180mm (7") Universal Dovetail

SW-S31000
1 in stock

180mm (7-inch) Losmandy-style D-plate Universal mounting with numerous pre-drilled holes Signature Sky-Watcher green anodized finish Light...

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$60.00 - $60.00
$60.00
$60.00 - $60.00
$60.00
$100.00 - $100.00
$100.00
$100.00 - $100.00
$100.00

Sky-Watcher D-Series 355mm (14") Universal Dovetail

SW-S31010

355mm (14 inch) Sky-Watcher green anodized Losmandy-style dovetail plate

$100.00 - $100.00
$100.00
$100.00 - $100.00
$100.00
Sold out
$550.00 - $550.00
$550.00
$550.00 - $550.00
$550.00

Software Bisque Mounting Ring Dovetail Accessory Plate

SB10328

Interfaces Truss-Tube Telescopes to Paramount Taurus Fork Arms Functions as a Dovetail Saddle for a Secure Connection Designed Specifically for So...

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$550.00 - $550.00
$550.00
$550.00 - $550.00
$550.00
Sold out
Sold out
$575.00 - $575.00
$575.00
$575.00 - $575.00
$575.00

Software Bisque Telescope Accessory Dovetail Plate

SB10325

Designed for Software Bisque Paramount ME II and Taurus Mounts Provides Secure Mounting for Large OTAs Weight: 7 lbs Dimensions: 14 × 12 × 5 in ...

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$575.00 - $575.00
$575.00
$575.00 - $575.00
$575.00
Sold out
SVBONY SV219 Vixen Style Dovetail Plate for Telescope Mounting
$11.51 - $11.51
$11.51
$11.51 - $11.51
$11.51

SVBONY SV219 120mm Black Vixen-Style Dovetail Mounting Plate

SV-W9175A

Function: Vixen-Style Dovetail Plate Material: Strong and Lightweight Aluminum Construction Finish: Black Anodized for Corrosion and Wear Resistan...

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$11.51 - $11.51
$11.51
$11.51 - $11.51
$11.51
SVBONY SV219 Vixen Style Dovetail Plate for Telescope Mounting
$13.67 - $13.67
$13.67
$13.67 - $13.67
$13.67

SVBONY SV219 210mm Black Vixen-Style Dovetail Mounting Plate

SV-W9175B
4 in stock

Vixen-Standard Width for Broad Mount Compatibility Lightweight and Rigid Aluminum Construction Durable Black Anodized Finish Resists Wear and Corr...

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$13.67 - $13.67
$13.67
$13.67 - $13.67
$13.67
SVBONY SV219 Vixen Style Dovetail Plate for Telescope Mounting
$18.33 - $18.33
$18.33
$18.33 - $18.33
$18.33

SVBONY SV219 300mm Black Vixen-Style Dovetail Mounting Plate

SV-W9175C
4 in stock

Functions as a Vixen-Style Dovetail Plate Machined to Vixen Standard Width for broad compatibility Lightweight and rigid Aluminum Construction Dur...

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$18.33 - $18.33
$18.33
$18.33 - $18.33
$18.33
SVBONY SV224 Universal Dovetail Base for Finder Scope Telescope Mount
$10.07 - $10.07
$10.07
$10.07 - $10.07
$10.07

SVBONY SV224 4.2mm Universal Dovetail Base for Finder Scopes

SV-W2370A
3 in stock

Universal dovetail base for finder scopes and other aiming devices Features 4.2mm universal dovetail slots for wide compatibility Equipped with tw...

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$10.07 - $10.07
$10.07
$10.07 - $10.07
$10.07
Tele Vue NP127is Bottom Plate 1
$69.00 - $69.00
$69.00
$69.00 - $69.00
$69.00

Tele Vue NP127is Bottom Plate

TV-BPL-1098

Attaches to Tele Vue MRS-5000 Mounting Rings Pre-drilled for Tele Vue Mounts Includes 1/4"-20 and 3/8"-16 Tripod Sockets Solid Machined Aluminum C...

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$69.00 - $69.00
$69.00
$69.00 - $69.00
$69.00
$35.00 - $35.00
$35.00
$35.00 - $35.00
$35.00

TS-Optics V-Series Dovetail for DSLR - 120mm

TS-PSFotoDel
Only 5 left!

The TS Optics PSFOTODEL dovetail plate allows you to attach heavy cameras, spotting scopes, telephoto lenses ... to an astronomical mount. One scre...

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$35.00 - $35.00
$35.00
$35.00 - $35.00
$35.00

Dovetail Standards, Length and Stiffness

Two standards dominate, and the difference between them is not just width — it is torsional stiffness, which is what actually stops a heavy tube from twisting under a guiding correction.

  • Vixen-style, approximately 44 mm: Light, near-universal on entry and mid-level mounts, and appropriate for visual loads and small imaging refractors up to a few kilograms.
  • Losmandy-style, approximately 75 mm: Substantially stiffer in torsion, the correct choice for heavy tubes and for imaging where differential flexure would otherwise show in your stars.
  • Length and balance range: A longer bar gives more fore-and-aft adjustment, which matters when adding a heavy camera train shifts the balance point well behind the rings.
  • Slotted versus drilled: Slotted bars allow continuous ring positioning; drilled bars fit specific hole patterns and are usually stiffer for the same mass.
  • Accessory rails: Short bars mounted on top of rings for guide scopes, cameras and finders, keeping accessories on the optical axis rather than cantilevered.
  • Dual-standard plates: Bars machined to fit both saddle types, useful when moving one telescope between mounts.

Why Choose David Astro for Dovetail Plates

Flexure is diagnosed rather than guessed at. We help you find it before you buy a replacement for the wrong component.

  • Saddle compatibility confirmed: We verify what your mount's saddle actually accepts, including dual-fit saddles that grip a narrow bar on its edges rather than its faces.
  • Length sized to your balance: We account for the rearward shift a filter wheel and camera introduce, so you are not left with the rings at the very end of the bar.
  • Machined quality: We stock bars whose dovetail angles are cut accurately enough to seat fully in a saddle, which cheap extruded bars often do not.
  • Authorized dealer: Genuine hardware with manufacturer warranty, stocked domestically and ready to ship.
  • Domestic shipping: Ships from Canada with no duties or brokerage charges for Canadian buyers.

Dovetail Plates in Canada — Frequently Asked Questions

How long a dovetail should I buy?
Long enough that your rings sit near the middle of the bar with the camera attached. If the rings end up at the very front to achieve balance, the bar is too short and you have lost adjustment range.
Is a Losmandy bar overkill for a small refractor?
Often yes, and the extra mass counts against your payload. Below about 7 kg total, a well-machined Vixen bar is usually adequate unless your mount's saddle is Losmandy only.
Can a dovetail cause guiding problems?
Yes. An undersized or poorly seated bar twists under correction, producing errors that look like tracking faults. If guiding degrades at particular tube angles, check the dovetail seating first.
Do you stock bars for specific telescopes?
We carry model-specific bars for many common tubes as well as universal slotted plates. Tell us the telescope and we will confirm the hole pattern.

Sizing a dovetail?

Send us your mount, tube and camera weight and we will specify the bar. Canadian stock, fast domestic shipping.