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Porte-oculaires et accessoires

Focus is the difference between a sharp image and a nearly sharp one, and holding it across a Canadian night — where temperatures can drop fifteen degrees between dusk and dawn — is a mechanical problem, not a patience problem. David Astro carries focusers and focuser accessories in Canada, from Crayford and rack-and-pinion drawtubes to motor kits, rotators, compression rings and adapter flanges, in Canadian stock.

We fit focusers to telescopes routinely, including retrofits that require a specific flange or drawtube adapter. If you are replacing a stock focuser or adding motorization, tell us the telescope and we will confirm the fit.

Filtres

CA$252.00 - CA$252.00
CA$252.00
CA$252.00 - CA$252.00
CA$252.00

Starlight Instruments Adaptateur True 3.0" Collet Couplé TFPE

SI-A32-3203-1

Anneau adaptateur de tube couplé TFPE doté d'un filetage mâle M120x1mm qui est livré en standard sur les porte-oculaires True 3.0 "" Feather Touch,...

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CA$252.00 - CA$252.00
CA$252.00
CA$252.00 - CA$252.00
CA$252.00
CA$280.00 - CA$280.00
CA$280.00
CA$280.00 - CA$280.00
CA$280.00

Starlight Instruments True 3.0" Base Courbée avec Vis de Nivellement

SI-BA32CL

Base incurvée avec vis de mise à niveau pour véritable porte-oculaire Feather Touch de 3,0" de diamètre Cette base se visse dans notre bague d'ada...

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CA$280.00 - CA$280.00
CA$280.00
CA$280.00 - CA$280.00
CA$280.00
CA$224.00 - CA$224.00
CA$224.00
CA$224.00 - CA$224.00
CA$224.00

Starlight Instruments True 3.0" Base Platte avec Vis de Nivellement

SI-BA32FL

Base plate avec vis de mise à niveau pour véritable porte-oculaire Feather Touch de 3,0" de diamètre Cette base se visse dans notre bague d'adapta...

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CA$224.00 - CA$224.00
CA$224.00
CA$224.00 - CA$224.00
CA$224.00
CA$224.00 - CA$224.00
CA$224.00
CA$224.00 - CA$224.00
CA$224.00

Starlight Instruments Embout True 3.0" avec Anneau de Compression 2.0"

SI-EC32-3205-1

Il s'agit de notre embout standard pour tous les porte-oculaires Feather Touch de 7,6 cm, sauf indication contraire. Il dispose d'un anneau de comp...

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CA$224.00 - CA$224.00
CA$224.00
CA$224.00 - CA$224.00
CA$224.00
CA$252.00 - CA$252.00
CA$252.00
CA$252.00 - CA$252.00
CA$252.00

Starlight Instruments Embout True 3.0" avec Anneau de Compression 3.0"

SI-EC32-3205-3CR

Ce capuchon d'extrémité a une ouverture de 7,6 cm pour les accessoires de 7,6 cm et peut avoir 3 vis à oreilles usinées. Il est usiné à partir d'a...

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CA$252.00 - CA$252.00
CA$252.00
CA$252.00 - CA$252.00
CA$252.00
CA$266.00 - CA$266.00
CA$266.00
CA$266.00 - CA$266.00
CA$266.00

Starlight Instruments Contrôle sans Fil du Porte-Oculaire Électronique

SI-FB-WiFi

La mise à niveau WiFi est une option sans fil qui vous permet d'utiliser votre Smart Phone ou votre IPAD pour contrôler la mise au point. Cette fon...

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CA$266.00 - CA$266.00
CA$266.00
CA$266.00 - CA$266.00
CA$266.00
SVBONY SV161 1.25-inch Double Helical Micro Focuser
CA$40.00 - CA$40.00
CA$40.00
CA$40.00 - CA$40.00
CA$40.00

SVBONY SV161 Double Helical Micro Focuser - 1.25"

SV-F9173B

Precise 0.05mm adjustment accuracy for fine focusing 10mm of draw tube travel Non-rotating mechanism keeps camera orientation fixed Standard M42x0...

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CA$40.00 - CA$40.00
CA$40.00
CA$40.00 - CA$40.00
CA$40.00
SVBONY SV181 Rack and Pinion Newtonian Reflector Focuser - 1.25"
SVBONY SV181 Rack and Pinion Newtonian Reflector Focuser - 1.25"
CA$43.00 - CA$43.00
CA$43.00
CA$43.00 - CA$43.00
CA$43.00

SVBONY SV181 Rack and Pinion Newtonian Reflector Focuser - 1.25"

SV-W9140A
1 en stock

65mm Focuser Travel 105mm Focuser Tube Length Accepts 1.25'' Eyepieces Fits 114mm-150mm Newtonian Reflectors Durable All-Metal Rack & Pinion D...

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CA$43.00 - CA$43.00
CA$43.00
CA$43.00 - CA$43.00
CA$43.00
SVBONY SV210 M63 360° CAA Camera Angle Adjuster
CA$41.00 - CA$41.00
CA$41.00
CA$41.00 - CA$41.00
CA$41.00

SVBONY SV210 M63 CAA 360° Rotator Camera Angle Adjuster

SV-W9162A

Adds 360° of camera rotation for precise image framing Designed specifically for the SVBONY SV550 80F6 telescope Adds 20.7mm of extension thicknes...

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CA$41.00 - CA$41.00
CA$41.00
CA$41.00 - CA$41.00
CA$41.00
Svbony 1.25" Telescope Eyepiece Adapter Coaxial Lock PETF Inner Ring
CA$22.00 - CA$22.00
CA$22.00
CA$22.00 - CA$22.00
CA$22.00

SVBONY Telescope Eyepiece Adapter with Coaxial Lock and PTFE Inner Ring - 1.25"

SV-F9164A

Adapts M42 threaded accessories to 1.25" focusers and holders Coaxial locking mechanism ensures a self-centering, secure grip PETF inner ring prev...

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CA$22.00 - CA$22.00
CA$22.00
CA$22.00 - CA$22.00
CA$22.00
SVBONY 1.25" Telescope Focuser Adapter M42x0.75 for Reflector
CA$20.00 - CA$20.00
CA$20.00
CA$20.00 - CA$20.00
CA$20.00

SVBONY Telescope Focuser Adapter M42x0.75 for Reflectors - 1.25"

SV-F9163A

Adapts M42x0.75 male threads to accept 1.25" eyepieces and accessories Provides 37mm to 47mm of adjustable focus distance Three locking thumbscrew...

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CA$20.00 - CA$20.00
CA$20.00
CA$20.00 - CA$20.00
CA$20.00
Tele Vue FocusmateDriver10:1 1
CA$347.00 - CA$347.00
CA$347.00
CA$347.00 - CA$347.00
CA$347.00

Tele Vue Focusmate Driver 10:1

TV-FDF-2004

Mechanism: 10:1 Planetary Ball Reduction Control: Dual-Speed Coarse and Fine Knobs Compatibility: Tele Vue Refractors with 2-inch Rack-and-Pinion ...

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CA$347.00 - CA$347.00
CA$347.00
CA$347.00 - CA$347.00
CA$347.00
Wanderer Astro MoonLite CRL 2.5" Focuser Extension Kit
CA$101.00 - CA$101.00
CA$101.00
CA$101.00 - CA$101.00
CA$101.00

Wanderer Astro MoonLite CRL 2.5" Focuser Extension Kit

WA-MLCRL-ETA

Specifically designed for the MoonLite CRL 2.5" focuser and motor Increases the distance between the focuser body and motor box Resolves clearance...

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CA$101.00 - CA$101.00
CA$101.00
CA$101.00 - CA$101.00
CA$101.00
Wanderer Astro WandererRotator Lite V2 (M68)
CA$769.00 - CA$769.00
CA$769.00
CA$769.00 - CA$769.00
CA$769.00

Wanderer Astro WandererRotator Lite V2 - M68

WA-WR2-M68

12mm Optical Thickness 550g Total Weight M68 Threaded Interface Precise Field Rotation for Framing Description FAQ Specifications In the Box Do...

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CA$769.00 - CA$769.00
CA$769.00
CA$769.00 - CA$769.00
CA$769.00
Wanderer Astro WandererRotator Mini V2 (M54)
CA$559.00 - CA$559.00
CA$559.00
CA$559.00 - CA$559.00
CA$559.00

Wanderer Astro WandererRotator Mini V2 - M54

WA-WR2-M54

Exceptionally Thin Profile to Conserve Back Focus Extremely Lightweight to Reduce Focuser Strain M54 Female and Male Threads for Common Imaging Tr...

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CA$559.00 - CA$559.00
CA$559.00
CA$559.00 - CA$559.00
CA$559.00
Wanderer Astro WandererRotator Pro V2 (M92)
CA$1,259.00 - CA$1,259.00
CA$1,259.00
CA$1,259.00 - CA$1,259.00
CA$1,259.00

Wanderer Astro WandererRotator Pro V2 - M92

WA-WR2-M92

16mm Ultra-Thin Profile Lightweight 800g Construction High-Resolution Motor Drive M92 Threaded Connections Quiet and Smooth Operation Descripti...

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CA$1,259.00 - CA$1,259.00
CA$1,259.00
CA$1,259.00 - CA$1,259.00
CA$1,259.00
CA$178.00 - CA$178.00
CA$178.00
CA$178.00 - CA$178.00
CA$178.00

William Optics Rotateur d'Angle de Caméra pour Porte-Oculaire 2.5" M63

WO-M-CAA63
1 en stock

Rotateur d'angle de caméra conçu pour le porte-oculaire William Optics 2,5" M63 Permet un réglage précis de l'angle de la caméra pour un ...

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CA$178.00 - CA$178.00
CA$178.00
CA$178.00 - CA$178.00
CA$178.00
William Optics M54 Camera Angle Rotator (CAA)
CA$164.00 - CA$164.00
CA$164.00
CA$164.00 - CA$164.00
CA$164.00

William Optics M54 Camera Angle Rotator (CAA)

WO-M-CAA54
1 en stock

360° of precise framing rotation Standard M54 male and female threads Adds a minimal 30.2 mm to the optical path Securely locks orientation for lo...

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CA$164.00 - CA$164.00
CA$164.00
CA$164.00 - CA$164.00
CA$164.00
CA$559.00 - CA$559.00
CA$559.00
CA$559.00 - CA$559.00
CA$559.00

ZWO CAA Rotator

ZWO-CAA-M54
21 en stock

Motorized rotation with 0.02° step resolution Adds only 16.5 mm of backfocus 48 mm clear aperture for full-frame sensors ASCOM and ASIAIR compatib...

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CA$559.00 - CA$559.00
CA$559.00
CA$559.00 - CA$559.00
CA$559.00
CA$69.00 - CA$69.00
CA$69.00
CA$69.00 - CA$69.00
CA$69.00

ZWO Support EAF pour Celestron C11/C14

ZWO-EAF-C11-C14
6 en stock

Pour les télescopes Celestron C11 et C14 SCT Pas besoin de focusers Feather Touch Fraisage CNC à partir d'un bloc d'aluminium de qualité aéronauti...

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

ZWO Support EAF pour Celestron C8/C9.25

ZWO-EAF-C8-C925
9 en stock

Pour les télescopes Celestron C8 et C9.25 SCT Pas besoin de focusers Feather Touch Fraisage CNC à partir d'un bloc d'aluminium de qualité aéronaut...

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CA$69.00 - CA$69.00
CA$69.00
CA$69.00 - CA$69.00
CA$69.00
CA$55.00 - CA$55.00
CA$55.00
CA$55.00 - CA$55.00
CA$55.00

ZWO EAF Bracket for Takahashi

ZWO-EAF-BRK-TK
2 en stock

Precision-machined for Takahashi focusers Includes both 4 mm and 5 mm flexible couplers Supports over 10 telescope models from Takahashi, Sky-Watc...

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CA$55.00 - CA$55.00
CA$55.00
CA$55.00 - CA$55.00
CA$55.00
CA$56.00 - CA$56.00
CA$56.00
CA$56.00 - CA$56.00
CA$56.00

ZWO Contrôleur EAF

ZWO-EAF-HC
5 en stock

Fournir une méthode simple pour la mise au point du télescope Poignée confortable Un incontournable pour les utilisateurs d'EAF ! Descript...

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CA$56.00 - CA$56.00
CA$56.00
CA$56.00 - CA$56.00
CA$56.00
CA$419.00 - CA$419.00
CA$419.00
CA$419.00 - CA$419.00
CA$419.00

ZWO EAF Pro Système de mise au point automatique électronique sans fil

ZWO-EAF-PRO
14 en stock

Automatisez votre focus Batterie intégrée Boutons de réglage de la mise au point intégrés Connectivité Bluetooth Charge utile de 5 kg Micro-Précis...

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CA$419.00 - CA$419.00
CA$419.00
CA$419.00 - CA$419.00
CA$419.00

Focuser Mechanics and What Matters Under Load

A focuser has to hold a camera train weighing several kilograms perfectly square to the optical axis while moving in increments of a few microns. Two things determine whether it does: the drive mechanism and the load rating.

  • Crayford focusers: A friction roller on a flat surface, giving smooth, backlash-free travel. Excellent for visual and light imaging loads; can slip under heavy trains, particularly when pointed near zenith.
  • Rack-and-pinion focusers: Toothed engagement that will not slip regardless of load, which is why most heavy imaging trains use them. Modern designs have effectively eliminated the old backlash complaints.
  • Motorized and electronic focusers: Stepper-driven focus with position repeatability, enabling autofocus routines and temperature compensation across a session.
  • Rotators: Precise framing and camera angle control without breaking the imaging train, and essential for optimizing off-axis guide star placement.
  • Compression rings: Replace a single set screw that tilts and marks your barrel with even radial clamping — a small part with a visible effect on star shapes.
  • Adapters and flanges: Telescope-specific mounting plates that let a third-party focuser replace a stock one.

Why Choose David Astro for Focusers and Accessories

Focuser upgrades are one of the most cost-effective improvements in astrophotography, and one of the easiest to order incorrectly.

  • Retrofit fit checks: We identify the adapter flange your specific telescope needs, and confirm that the new focuser's travel and profile will still let you reach focus.
  • Load rating advice: We weigh your intended imaging train against the focuser's rated capacity, including the tilt load that shows up when the tube is near zenith.
  • Authorized dealer: Genuine parts with full manufacturer warranty, serviced in Canada.
  • Canadian stock: In-stock focusers and accessories ship domestically without duties or brokerage charges.
  • In-house repair: We service focuser mechanics and electronics directly, which matters for a component with moving parts that see heavy use.

Focusers in Canada — Frequently Asked Questions

Crayford or rack-and-pinion for imaging?
Rack-and-pinion, once your imaging train exceeds roughly 2 kg. A Crayford's friction drive can slip under load at steep angles, and the slip is often mistaken for focus drift.
Will a motorized focuser fit my existing focuser?
Often yes, through a telescope-specific bracket that couples to the fine-focus shaft. Tell us the focuser model and we will confirm whether a bracket exists or a full replacement is needed.
How much does focus shift with temperature?
Enough to matter. A metal tube contracts measurably over a 15 degree drop, and at fast focal ratios the critical focus zone is only tens of microns. Temperature-compensated autofocus solves it.
Do you carry focusers for older telescopes?
We carry a wide range of adapter flanges covering many discontinued tubes. Send us the make and drawtube diameter and we will check.

Upgrading your focuser?

Tell us your telescope and imaging train weight and we will specify the right focuser and flange. Canadian stock, expert fitting advice.