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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.

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Starlight Instruments Adaptateur 2.0" pour télescopes Astro-Tech 65mm

Relie les porte-oculaires Starlight Instruments 2.0" aux télescopes Astro-Tech 65mm Garantit un montage rigide à filetage direct pour l'astrophoto...

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Starlight Instruments Adaptateur 2.0" pour télescopes Astro-Tech 72mm et William Optics 72mm

Permet de monter un porte-oculaire Starlight Instruments 2.0" Conçu pour les lunettes Astro-Tech 72mm Conçu pour les lunettes William Optics 72mm ...

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Starlight Instruments Adaptateur 2.0" pour Borg M57

Relie les porte-oculaires Starlight Instruments 2.0" aux télescopes Borg Filetage côté télescope : Borg M57 Filetage côté porte-oculaire : 69mm x ...

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Starlight Instruments Adaptateur 2.0" pour télescopes Brandon

Adapte les télescopes Brandon aux accessoires 2.0" Filetage côté télescope : 71x1mm À utiliser avec le porte-oculaire Feather Touch FTF2025BCR Usi...

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Starlight Instruments Adaptateur 2.0" pour télescopes SCT Celestron & Meade montés sur fourche

Permet de monter des porte-oculaires Feather Touch 2.0" Convient notamment aux Celestron C/CPC8, C/CPC9.25 et Meade 8" RCX400, LX90, LX200 Se fixe...

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Starlight Instruments Adaptateur 2.0" pour télescopes SCT Celestron & Meade à petit filetage

Relie les porte-oculaires Starlight Instruments FTF2015BCR à certains SCT S'adapte aux modèles Celestron 8", CPC 800, 9.25" et CPC 9.25 S'adapte a...

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Starlight Instruments Adaptateur 2.0" pour télescopes SCT Celestron C11 /C14

Adapte les porte-oculaires Feather Touch 2.0" aux SCT Celestron grand format Se visse sur la cellule arrière 3.29"-16TPI des tubes optiques C11 et...

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Starlight Instruments Adaptateur 2.0" pour télescopes SCT Celestron C11/ C14

Relie les porte-oculaires Feather Touch 2.0" à certains SCT Celestron Se visse sur le grand adaptateur visuel 3.29-16 Compatible avec les modèles ...

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Starlight Instruments Adaptateur 2.0" pour télescope Celestron C70

Adapte les lunettes Celestron C70 pour accepter des porte-oculaires 2.0" Permet d'utiliser les porte-oculaires Feather Touch Starlight Instruments...

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Starlight Instruments Adaptateur 2.0" pour télescope Celestron 102mm

Adapte les télescopes Celestron 102mm Accepte les porte-oculaires Feather Touch Starlight Instruments 2.0" Permet une mise au point de précision p...

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Starlight Instruments Adaptateur 2.0" pour ES Comet Hunter

Permet de monter un porte-oculaire Feather Touch 2.0" Conçu pour l'Explore Scientific Comet Hunter À utiliser avec le porte-oculaire Feather Touch...

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Starlight Instruments Adaptateur 2.0" pour Newton GSO Carbon Truss

Permet l'installation de porte-oculaires Feather Touch 2.0" Conçu sur mesure pour les Newton GSO Carbon Truss Conception en deux pièces utilisant ...

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Starlight Instruments Adaptateur 2.0" pour lunettes Lunt

Permet de monter un porte-oculaire Feather Touch 2.0" sur les lunettes Lunt compatibles Offre une connexion mécanique directe et solide Usiné spéc...

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Starlight Instruments Adaptateur 2.0" pour télescopes SCT Meade 10, 12, 14"

Connecte des porte-oculaires Feather Touch 2.0" aux grands SCT Meade Compatible avec les modèles Schmidt-Cassegrain Meade 10", 12" et 14" Se visse...

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Starlight Instruments 2.0" Adapter for Meade 10, 12, 14" SCT Telescopes, for FTF2008BCR Focuser
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Starlight Instruments Adaptateur 2.0" pour télescopes SCT Meade 10, 12, 14", pour porte-oculaire FTF2008BCR

Connecte le porte-oculaire FTF2008BCR aux SCT Meade Compatible avec les SCT Meade 10", 12" et 14" Se visse directement sur les grands filetages de...

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Starlight Instruments Adaptateur 2.0" pour télescopes Meade 80mm

Permet de monter un porte-oculaire Feather Touch 2.0" Starlight Instruments Conçu sur mesure pour les télescopes Meade de la série 80mm Offre une ...

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Starlight Instruments Adaptateur 2.0" pour télescopes Dobson à treillis Meade Lightbridge

Permet d'installer un porte-oculaire Feather Touch 2.0" Starlight Instruments Conçu spécialement pour les télescopes Dobson à treillis Meade Light...

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Starlight Instruments Adaptateur 2.0" pour Maksutov-Newton MK190, Intes Alter MN84 Mak-Newton et astrographe ES 8" à tube en carbone

Permet de monter un porte-oculaire Feather Touch 2" Compatible avec le Maksutov-Newton Sky-Watcher MN190 Compatible avec le Maksutov-Newton Intes ...

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Starlight Instruments Adaptateur 2.0" pour télescope MK67/MK69

Connecte des porte-oculaires Feather Touch 2.0" aux télescopes Intes-Micro Conçu spécialement pour les modèles Alter MK67 et MK69 Usiné avec préci...

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Starlight Instruments Adaptateur 2.0" pour William Optics Megrez 90 ancienne génération

Connecte un porte-oculaire Feather Touch 2.0" à une William Optics Megrez 90 ancienne génération Usiné avec précision pour un ajustement solide et...

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Starlight Instruments Adaptateur 2.0" pour télescopes Orion Sky Quest, XT Intelliscope

Permet d'utiliser des porte-oculaires Feather Touch 2.0" sur les télescopes compatibles Convient aux modèles Orion Sky Quest, XT Classic et XT Int...

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Starlight Instruments Adaptateur 2.0" pour télescopes Orion Sky Quest, XT Intelliscope, avec trou de fixation inférieur non circulaire

Permet de monter des porte-oculaires Feather Touch 2.0" Conçu pour les modèles Orion Sky Quest XT Classic & Intelliscope Compatible avec les o...

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Starlight Instruments Adaptateur 2.0" pour télescopes Orion, Celestron, Sky-Watcher Vixen & Synta

Connecte des porte-oculaires Feather Touch 2.0" à certains télescopes Conçu pour les tubes nécessitant un adaptateur de 3.804" de diamètre extérie...

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Starlight Instruments Adaptateur 2.0" pour lunettes apochromatiques PENTAX 75mm SDHF

Connecte les porte-oculaires Starlight Instruments 2.0" aux lunettes apochromatiques Pentax 75mm SDHF Offre une connexion solide, directement file...

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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.