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Plaques à queue d'aronde

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.

Filtres

CA$49.00 - CA$49.00
CA$49.00
CA$49.00 - CA$49.00
CA$49.00

Lunt Série V - Barre à queue d'aronde - 6"

LSS-LS150PS
3 en stock

Fabriqué en aluminium anodisé noir avec filetage 1/4-20. La largeur convient aux supports de style Vixen. Les barres Lunt Dovetail sont parfa...

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CA$49.00 - CA$49.00
CA$49.00
CA$49.00 - CA$49.00
CA$49.00
Orion Optics UK Base Plate - 250mm Length
CA$187.00 - CA$187.00
CA$187.00
CA$217.00
CA$217.00 - CA$217.00
CA$217.00

Orion Optics UK Base Plate - 250mm Length

OOUK-BASE-PLATE-250MM-4-WIDE

Length: 250mm Width: 4 inches Thickness: 10mm Provides a stable, non-flexing mounting surface Ideal for custom telescope and astrophotography setu...

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CA$187.00 - CA$187.00
CA$187.00
CA$217.00
CA$217.00 - CA$217.00
CA$217.00
Orion Optics UK Base Plate - 400mm Length
CA$270.00 - CA$270.00
CA$270.00
CA$300.00
CA$300.00 - CA$300.00
CA$300.00

Orion Optics UK Base Plate - 400mm Length

OOUK-BASE-PLATE-400MM-4-WIDE

400mm Total Length Provides a Solid Connection Between OTA and Mount Engineered to Minimize Mechanical Flexure Designed for Orion Optics UK Telesc...

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CA$270.00 - CA$270.00
CA$270.00
CA$300.00
CA$300.00 - CA$300.00
CA$300.00
Orion Optics UK Base Plate 300mm length
CA$218.00 - CA$218.00
CA$218.00
CA$248.00
CA$248.00 - CA$248.00
CA$248.00

Orion Optics UK Base Plate 300mm length

OOUK-BASE-PLATE-300MM-4-WIDE

Engineered by Orion Optics UK Provides a Rigid, Flex-Free Mounting Platform Connects Telescope Tube Rings to Mount Saddles Solid Metal Constructio...

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CA$218.00 - CA$218.00
CA$218.00
CA$248.00
CA$248.00 - CA$248.00
CA$248.00
Orion Optics UK Base Plate 350mm length
CA$249.00 - CA$249.00
CA$249.00
CA$279.00
CA$279.00 - CA$279.00
CA$279.00

Orion Optics UK Base Plate 350mm length

OOUK-BASE-PLATE-350MM-4-WIDE

Provides a solid, flat mounting surface for telescope tube rings Engineered to eliminate flexure in the optical train Serves as the core structura...

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CA$249.00 - CA$249.00
CA$249.00
CA$279.00
CA$279.00 - CA$279.00
CA$279.00
Orion Optics UK Base Plate 450mm length
CA$363.00 - CA$363.00
CA$363.00
CA$393.00
CA$393.00 - CA$393.00
CA$393.00

Orion Optics UK Base Plate 450mm length

OOUK-BASE-PLATE-450MM-4-WIDE

450mm Length 4-inch Width 10mm Thickness Provides a rigid mounting surface for telescope tube rings Description FAQ Specifications In the Box W...

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CA$363.00 - CA$363.00
CA$363.00
CA$393.00
CA$393.00 - CA$393.00
CA$393.00
Orion Optics UK Celestron CGEM Dovetail 3" wide plate 250mm long
CA$353.00 - CA$353.00
CA$353.00
CA$383.00
CA$383.00 - CA$383.00
CA$383.00

Orion Optics UK Celestron CGEM Dovetail 3" wide plate 250mm long

OOUK-CELESTRON-CGEM-DOVETAIL-3-WIDE

250mm length Fits Celestron CGEM mounts CNC machined in the UK Description Specifications In the Box Warranty 250mm Celestron CGEM Doveta...

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CA$353.00 - CA$353.00
CA$353.00
CA$383.00
CA$383.00 - CA$383.00
CA$383.00
Orion Optics UK Celestron CGEM Dovetail 3" wide plate 350mm long
CA$374.00 - CA$374.00
CA$374.00
CA$404.00
CA$404.00 - CA$404.00
CA$404.00

Orion Optics UK Celestron CGEM Dovetail 3" wide plate 350mm long

OOUK-CELESTRON-CGEM-DOVETAIL-3-WIDE-2

350mm length Fits Celestron CGEM mounts CNC machined in the UK Description Specifications In the Box Warranty 350mm Celestron CGEM Doveta...

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CA$374.00 - CA$374.00
CA$374.00
CA$404.00
CA$404.00 - CA$404.00
CA$404.00
Orion Optics UK Dovetail Plate for Orion Tube Cradles
CA$129.00 - CA$129.00
CA$129.00
CA$159.00
CA$159.00 - CA$159.00
CA$159.00

Orion Optics UK Dovetail Plate for Orion Tube Cradles

OOUK-DOVETAIL-PLATE-ORION-CRADLES-EQ5

Connects Orion Optics UK Tube Cradles to a Mount Vixen-Style Dovetail Profile Compatible with VX and IDEAL Series Telescopes Fits EQ5, EQ6, GP, an...

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CA$129.00 - CA$129.00
CA$129.00
CA$159.00
CA$159.00 - CA$159.00
CA$159.00
Orion Optics UK Dovetail Plate Skywatcher/Vixen 355mm
CA$165.00 - CA$165.00
CA$165.00
CA$265.00
CA$265.00 - CA$265.00
CA$265.00

Orion Optics UK Dovetail Plate Skywatcher/Vixen 355mm

OOUK-DOVETAIL-PLATE-43MM-X-355MM

Length: 355mm Width: 43mm Compatibility: Vixen / Sky-Watcher Style Saddles Provides Secure Mounting for Optical Tubes Description FAQ Specifica...

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CA$165.00 - CA$165.00
CA$165.00
CA$265.00
CA$265.00 - CA$265.00
CA$265.00
Orion Optics UK Female Losmandy Baseplate 400mm long
CA$533.00 - CA$533.00
CA$533.00
CA$563.00
CA$563.00 - CA$563.00
CA$563.00

Orion Optics UK Female Losmandy Baseplate 400mm long

OOUK-FEMALE-LOSMANDY-BASEPLATE-400MM

400mm length Fits Losmandy-standard mounts CNC machined in the UK Description Specifications In the Box Warranty 400mm Female Losmandy Ba...

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CA$533.00 - CA$533.00
CA$533.00
CA$563.00
CA$563.00 - CA$563.00
CA$563.00
Orion Optics UK Losmandy Attachment Plate - 250mm Long
CA$353.00 - CA$353.00
CA$353.00
CA$383.00
CA$383.00 - CA$383.00
CA$383.00

Orion Optics UK Losmandy Attachment Plate - 250mm Long

OOUK-AG8-LOSMANDY-ATTACHMENT-PLATE-250MM

250mm length for optimal balance and support Standard Losmandy D-style dovetail profile Machined from a single piece of solid, aero-grade aluminum...

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CA$353.00 - CA$353.00
CA$353.00
CA$383.00
CA$383.00 - CA$383.00
CA$383.00
Orion Optics UK Losmandy Attachment Plate - 300mm Long (AG10)
CA$363.00 - CA$363.00
CA$363.00
CA$393.00
CA$393.00 - CA$393.00
CA$393.00

Orion Optics UK Losmandy Attachment Plate - 300mm Long (AG10)

OOUK-AG10-LOSMANDY-ATTACHMENT-PLATE-300MM

300mm Length Losmandy D-Style Dovetail Solid Aero-Grade Aluminum Construction Mounts Orion Optics CT & AG Telescopes Adapts CNC Rings to Vixen...

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CA$363.00 - CA$363.00
CA$363.00
CA$393.00
CA$393.00 - CA$393.00
CA$393.00
Orion Optics UK Losmandy Attachment Plate - 350mm Long
CA$374.00 - CA$374.00
CA$374.00
CA$404.00
CA$404.00 - CA$404.00
CA$404.00

Orion Optics UK Losmandy Attachment Plate - 350mm Long

OOUK-AG10-LOSMANDY-ATTACHMENT-PLATE-350MM

Losmandy D-Style Dovetail Profile 350mm Overall Length Solid Aerospace-Grade Aluminum Construction Direct Fit for Losmandy & Paramount Mounts ...

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CA$374.00 - CA$374.00
CA$374.00
CA$404.00
CA$404.00 - CA$404.00
CA$404.00
Orion Optics UK Losmandy Attachment Plate - 450mm Long
CA$394.00 - CA$394.00
CA$394.00
CA$424.00
CA$424.00 - CA$424.00
CA$424.00

Orion Optics UK Losmandy Attachment Plate - 450mm Long

OOUK-LOSMANDY-BASEPLATE-450MM

450mm Length for Large Aperture Telescopes Losmandy D-Style Dovetail Profile Machined from Solid Aerospace-Grade Aluminum Designed for Orion Optic...

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CA$394.00 - CA$394.00
CA$394.00
CA$424.00
CA$424.00 - CA$424.00
CA$424.00
Orion Optics UK Losmandy Attachment Plate 300mm Long
CA$363.00 - CA$363.00
CA$363.00
CA$393.00
CA$393.00 - CA$393.00
CA$393.00

Orion Optics UK Losmandy Attachment Plate 300mm Long

OOUK-AG8-LOSMANDY-ATTACHMENT-PLATE-300MM

300mm Length Losmandy D-Style Dovetail Solid Aero-Grade Aluminum Compatible with Losmandy & Paramount Mounts Designed for Orion Optics UK CT &...

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CA$363.00 - CA$363.00
CA$363.00
CA$393.00
CA$393.00 - CA$393.00
CA$393.00
Orion Optics UK Losmandy Attachment Plate 350mm Long
CA$374.00 - CA$374.00
CA$374.00
CA$404.00
CA$404.00 - CA$404.00
CA$404.00

Orion Optics UK Losmandy Attachment Plate 350mm Long

OOUK-AG12-LOSMANDY-ATTACHMENT-PLATE-350MM

350mm Length Losmandy D-Style Dovetail Solid Aero-Grade Aluminum Construction Compatible with Losmandy & Paramount Mounts Mounting Platform fo...

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CA$374.00 - CA$374.00
CA$374.00
CA$404.00
CA$404.00 - CA$404.00
CA$404.00
Orion Optics UK Losmandy Attachment Plate 400mm Long
CA$386.00 - CA$386.00
CA$386.00
CA$416.00
CA$416.00 - CA$416.00
CA$416.00

Orion Optics UK Losmandy Attachment Plate 400mm Long

OOUK-AG12-LOSMANDY-ATTACHMENT-PLATE-400MM

Length: 400mm Dovetail Standard: Losmandy D-Style Compatibility: Losmandy & Paramount Mounts Construction: Solid, single-piece aero-grade ...

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CA$386.00 - CA$386.00
CA$386.00
CA$416.00
CA$416.00 - CA$416.00
CA$416.00
Orion Optics UK Losmandy Attachment Plate 400mm Long
CA$386.00 - CA$386.00
CA$386.00
CA$416.00
CA$416.00 - CA$416.00
CA$416.00

Orion Optics UK Losmandy Attachment Plate 400mm Long

OOUK-AG14-LOSMANDY-ATTACHMENT-PLATE-400MM

400mm Dovetail Plate Losmandy D-Style Profile Solid Aero-Grade Aluminum Construction Mounts CT and AG Telescopes Compatible with Losmandy & Pa...

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CA$386.00 - CA$386.00
CA$386.00
CA$416.00
CA$416.00 - CA$416.00
CA$416.00
Orion Optics UK Losmandy Attachment Plate 400mm Long
CA$384.00 - CA$384.00
CA$384.00
CA$414.00
CA$414.00 - CA$414.00
CA$414.00

Orion Optics UK Losmandy Attachment Plate 400mm Long

OOUK-LOSMANDY-BASEPLATE-400MM

400mm Length Losmandy D-Style Dovetail Profile Solid Aero-Grade Aluminium Construction Designed for Orion Optics UK CT & AG Telescopes Desc...

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CA$384.00 - CA$384.00
CA$384.00
CA$414.00
CA$414.00 - CA$414.00
CA$414.00
Orion Optics UK Losmandy Attachment Plate 450mm Long
CA$394.00 - CA$394.00
CA$394.00
CA$424.00
CA$424.00 - CA$424.00
CA$424.00

Orion Optics UK Losmandy Attachment Plate 450mm Long

OOUK-AG14-LOSMANDY-ATTACHMENT-PLATE-450MM

450mm length matches larger aperture telescopes Losmandy D-style dovetail standard Machined from a single block of aero-grade aluminum Directly mo...

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CA$394.00 - CA$394.00
CA$394.00
CA$424.00
CA$424.00 - CA$424.00
CA$424.00
Orion Optics UK Losmandy Attachment Plate 450mm Long
CA$394.00 - CA$394.00
CA$394.00
CA$424.00
CA$424.00 - CA$424.00
CA$424.00

Orion Optics UK Losmandy Attachment Plate 450mm Long

OOUK-AG16-LOSMANDY-ATTACHMENT-PLATE-450MM

Length: 450mm Profile: Losmandy "D" Style Material: Solid Aero-Grade Aluminum Compatibility: Losmandy & Paramount Mounts Primary Use: Mounting...

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CA$394.00 - CA$394.00
CA$394.00
CA$424.00
CA$424.00 - CA$424.00
CA$424.00
Orion Optics UK Losmandy dovetail 250mm long
CA$353.00 - CA$353.00
CA$353.00
CA$353.00 - CA$353.00
CA$353.00

Orion Optics UK Losmandy dovetail 250mm long

OOUK-LOSMANDY-DOVETAIL-250MM

250mm length Fits Losmandy-standard mounts CNC machined in the UK Description Specifications In the Box Warranty 250mm Losmandy Dovetail ...

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CA$353.00 - CA$353.00
CA$353.00
CA$353.00 - CA$353.00
CA$353.00
Orion Optics UK Losmandy Dovetail 300mm long
CA$363.00 - CA$363.00
CA$363.00
CA$363.00 - CA$363.00
CA$363.00

Orion Optics UK Losmandy Dovetail 300mm long

OOUK-LOSMANDY-DOVETAIL-300MM

300mm length Fits Losmandy-standard mounts CNC machined in the UK Description Specifications In the Box Warranty 300mm Losmandy Dovetail ...

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CA$363.00 - CA$363.00
CA$363.00
CA$363.00 - CA$363.00
CA$363.00

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.