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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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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
Orion Optics UK Losmandy Dovetail 350mm long
CA$374.00 - CA$374.00
CA$374.00
CA$374.00 - CA$374.00
CA$374.00

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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CA$374.00 - CA$374.00
CA$374.00
CA$374.00 - CA$374.00
CA$374.00
Orion Optics UK Losmandy dovetail plate 585mm long used on VX20
CA$446.00 - CA$446.00
CA$446.00
CA$446.00 - CA$446.00
CA$446.00

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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CA$446.00 - CA$446.00
CA$446.00
CA$446.00 - CA$446.00
CA$446.00
CA$617.00 - CA$617.00
CA$617.00
CA$617.00 - CA$617.00
CA$617.00

Pegasus Astro Saddle Powerbox

PEG-SADDLEPBOX

Supports both Losmandy and Vixen style dovetail plates 40kg / 88 lbs total payload capacity Provides 10A of total power across four 12V outputs Fe...

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CA$617.00 - CA$617.00
CA$617.00
CA$617.00 - CA$617.00
CA$617.00
CA$41.00 - CA$41.00
CA$41.00
CA$41.00 - CA$41.00
CA$41.00

Pegasus Mounting Shoe for PowerBox and DewMaster v2

PEG-SHOE
3 in stock

Securely Mounts Pegasus Astro Powerboxes and DewMaster 2 Compatible with Pocket Powerbox Micro Compatible with Pocket Powerbox Advance (Blue...

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

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.