Passer au contenu
Égalisation des prix Retours sous 30 jours* Parlez à un astronome avant d'acheter

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

PrimaLuceLab 3" Visual Back for ESATTO 3.5” LP
$95.00 - $95.00
$95.00
$95.00 - $95.00
$95.00

PrimaLuceLab 3" Visual Back for ESATTO 3.5” LP

PLL-PL8410011

Adapts ESATTO 3.5" LP focusers to accept 3" accessories Internal brass compression ring prevents scratches Multiple locking screws ensure a secure...

Afficher tous les détails
$95.00 - $95.00
$95.00
$95.00 - $95.00
$95.00
$76.00 - $76.00
$76.00
$76.00 - $76.00
$76.00

Adaptateur PrimaLuceLab 33mm pour SESTO SENSO 2

PLL-SESTOSENSO-AD33II

Cet adaptateur de 33 mm vous permet d'installer SESTO SENSO 2 sur des porte-oculaires équipés d'un arbre de 33 mm de diamètre, comme les porte-ocul...

Afficher tous les détails
$76.00 - $76.00
$76.00
$76.00 - $76.00
$76.00
$85.00 - $85.00
$85.00
$85.00 - $85.00
$85.00

Adaptateur PrimaLuceLab 37mm pour SESTO SENSO 2

PLL-SESTOSENSO-AD37II

Cet adaptateur 37mm s'installe sur le porte oculaire à la place des 2 molettes (macrométrique et micrométrique), vous pouvez alors installer SES...

Afficher tous les détails
$85.00 - $85.00
$85.00
$85.00 - $85.00
$85.00
PrimaLuceLab 40mm Extension Tube for ESATTO 3"
$125.00 - $125.00
$125.00
$125.00 - $125.00
$125.00

PrimaLuceLab 40mm Extension Tube for ESATTO 3"

PLL-PL3600317

Adds 40mm of back focus for ESATTO 3" focusers Enables focus with long-travel telescopes like refractors Precise dovetail coupling system for rigi...

Afficher tous les détails
$125.00 - $125.00
$125.00
$125.00 - $125.00
$125.00
$125.00 - $125.00
$125.00
$125.00 - $125.00
$125.00

Tube d'extension PrimaLuceLab 65mm pour ESATTO 3"

PLL-PL3600284

Lors de l'installation d'ESATTO 3" dans un télescope avec un porte-oculaire à longue course (comme ceux que l'on trouve habituellement sur les r...

Afficher tous les détails
$125.00 - $125.00
$125.00
$125.00 - $125.00
$125.00
$49.00 - $49.00
$49.00
$49.00 - $49.00
$49.00

Adaptateur PrimaLuceLab ESATTO 2" pour ARCO 2"

PLL-PL3600412

L'adaptateur ESATTO 2" pour ARCO 2" vous permet de connecter le rotateur au microfocuser ESATTO 2" ESATTO 2" et de le contrôler via le port spécial...

Afficher tous les détails
$49.00 - $49.00
$49.00
$49.00 - $49.00
$49.00
$595.00 - $595.00
$595.00
$595.00 - $595.00
$595.00

Adaptateur PrimaLuceLab ESATTO 2" pour Borg 55FL f3.6

PLL-PL3600248

Cet adaptateur vous permet ainsi d'utiliser le microfocuseur robotique ESATTO 2" avec l'objectif fluorite Borg 55mm et le réducteur 7880 pour créer...

Afficher tous les détails
$595.00 - $595.00
$595.00
$595.00 - $595.00
$595.00
$79.00 - $79.00
$79.00
$79.00 - $79.00
$79.00

Adaptateur PrimaLuceLab ESATTO 2" pour GSO/Orion/TPO Ritchey-Chretien 6 et 8"

PLL-PL3600235

Si vous recherchez la mise au point motorisée la plus précise pour utiliser le GSO/Orion/TPO Ritchey-Chretien 152 mm f/9 ou 203 mm f/8 (tubes alum...

Afficher tous les détails
$79.00 - $79.00
$79.00
$79.00 - $79.00
$79.00
$145.00 - $145.00
$145.00
$145.00 - $145.00
$145.00

Adaptateur PrimaLuceLab ESATTO 2" pour Sky-Watcher/Orion ED80, ED100 et ED120

PLL-PL3600230

Si vous recherchez le porte-oculaire motorisé le plus précis pour utiliser les réfracteurs apochromatiques SkyWatcher/Orion ED80, ED100 ou ED120 po...

Afficher tous les détails
$145.00 - $145.00
$145.00
$145.00 - $145.00
$145.00
$165.00 - $165.00
$165.00
$165.00 - $165.00
$165.00

Adaptateur PrimaLuceLab ESATTO 2" pour Sky-Watcher/Orion Newton 200 f4 et f5

PLL-PL3600229

Si vous recherchez la mise au point motorisée la plus précise pour utiliser les réflecteurs SkyWatcher/Orion Newton 200 f4 et f5 pour l'astrophotog...

Afficher tous les détails
$165.00 - $165.00
$165.00
$165.00 - $165.00
$165.00
$165.00 - $165.00
$165.00
$165.00 - $165.00
$165.00

Adaptateur PrimaLuceLab ESATTO 2" pour Sky-Watcher/Orion Newton 250 f4 et f5

PLL-PL3600237

Si vous recherchez la mise au point motorisée la plus précise pour utiliser le réflecteur SkyWatcher/Orion Newton 250 f4 et f5 pour l'astrophotogra...

Afficher tous les détails
$165.00 - $165.00
$165.00
$165.00 - $165.00
$165.00
$145.00 - $145.00
$145.00
$145.00 - $145.00
$145.00

Adaptateur PrimaLuceLab ESATTO 2" pour Takahashi FS-60Q

PLL-PL3600255

Si vous recherchez la mise au point motorisée la plus précise pour Takahashi FS-60Q, cet adaptateur vous permet de connecter ESATTO 2" à ce télesc...

Afficher tous les détails
$145.00 - $145.00
$145.00
$145.00 - $145.00
$145.00
$65.00 - $65.00
$65.00
$65.00 - $65.00
$65.00

Adaptateur PrimaLuceLab ESATTO 2" pour télescopes avec grand filetage SC 3,3"

PLL-PL3600212

L'adaptateur SC 3,3" pour ESATTO 2" vous permet de connecter l'ESATTO 2" aux modèles Celestron SCT (11" et 14") et EdgeHD (925, 1100 et 1400). Étan...

Afficher tous les détails
$65.00 - $65.00
$65.00
$65.00 - $65.00
$65.00
$35.00 - $35.00
$35.00
$35.00 - $35.00
$35.00

Adaptateur PrimaLuceLab ESATTO 2" pour télescopes avec filetage SC

PLL-PL3600209

Grâce à son profil bas, l'ESATTO 2" est le porte-oculaire motorisé parfait pour les télescopes Schmidt-Cassegrain comme les modèles Celestron SCT ...

Afficher tous les détails
$35.00 - $35.00
$35.00
$35.00 - $35.00
$35.00
PrimaLuceLab Adapter ESATTO 2" LP and ARCO 2" for telescopes with SC thread
$95.00 - $95.00
$95.00
$95.00 - $95.00
$95.00

PrimaLuceLab Adapter ESATTO 2" LP and ARCO 2" for telescopes with SC thread

PLL-PL3600542

Connects ESATTO 2" LP Focuser to SC threads Connects ARCO 2" Rotator to SC threads Enables a fully threaded, rigid imaging train Designed for Schm...

Afficher tous les détails
$95.00 - $95.00
$95.00
$95.00 - $95.00
$95.00
PrimaLuceLab Adapter ESATTO 2" LP for ARCO 2"
$95.00 - $95.00
$95.00
$95.00 - $95.00
$95.00

PrimaLuceLab Adapter ESATTO 2" LP for ARCO 2"

PLL-PL3600538

Connects the PrimaLuceLab ESATTO 2" LP Focuser to the ARCO 2" Rotator Creates a rigid, unified imaging assembly with a 22mm combined thickness Mai...

Afficher tous les détails
$95.00 - $95.00
$95.00
$95.00 - $95.00
$95.00
PrimaLuceLab Adapter ESATTO 2” LP for telescopes with large 3.3" SC thread
$95.00 - $95.00
$95.00
$95.00 - $95.00
$95.00

PrimaLuceLab Adapter ESATTO 2” LP for telescopes with large 3.3" SC thread

PLL-PL3600539

Connects ESATTO 2” LP to telescopes with a large 3.3" SC thread Designed for Celestron SCT (11" and 14") and EdgeHD (9.25", 11", and 14") models E...

Afficher tous les détails
$95.00 - $95.00
$95.00
$95.00 - $95.00
$95.00
$69.00 - $69.00
$69.00
$69.00 - $69.00
$69.00

PrimaLuceLab Adapter ESATTO 3" for ARCO 2"

PLL-PL3600416

Connects ARCO 2" Rotator to ESATTO 3" Focuser Enables Direct Power and Control via ESATTO Port Creates a Rigid, Mechanically Coupled Imaging Train...

Afficher tous les détails
$69.00 - $69.00
$69.00
$69.00 - $69.00
$69.00
$95.00 - $95.00
$95.00
$95.00 - $95.00
$95.00

PrimaLuceLab Adapter ESATTO 3" for ARCO 3"

PLL-PL3600458

Connects ESATTO 3" Focuser to ARCO 3" Rotator Enables Electronic Control via ESATTO Port Results in a Combined Rotator Thickness of 24.5mm Maintai...

Afficher tous les détails
$95.00 - $95.00
$95.00
$95.00 - $95.00
$95.00
$195.00 - $195.00
$195.00
$195.00 - $195.00
$195.00

Adaptateur PrimaLuceLab ESATTO 3" pour Borg 90FL et 107FL f3.9

PLL-PL3600268

Si vous recherchez la mise au point motorisée la plus précise pour Borg 90FL et 107FL f3.9, cet adaptateur vous permet de connecter ESATTO 3" à ce...

Afficher tous les détails
$195.00 - $195.00
$195.00
$195.00 - $195.00
$195.00
$125.00 - $125.00
$125.00
$125.00 - $125.00
$125.00

Adaptateur PrimaLuceLab ESATTO 3" pour GSO/Orion/TPO Ritchey-Chretien 10, 12, 14 et 16"

PLL-PL3600236

Si vous recherchez le porte-oculaire motorisé le plus précis pour utiliser les GSO/Orion/TPO Ritchey-Chretien 10, 12, 14 et 16 pouces (tubes alumin...

Afficher tous les détails
$125.00 - $125.00
$125.00
$125.00 - $125.00
$125.00
$295.00 - $295.00
$295.00
$295.00 - $295.00
$295.00

Adaptateur PrimaLuceLab ESATTO 3" pour Meade 16" avec filetage 4"

PLL-PL3600292

L'adaptateur ESATTO 3" pour Meade 16 pouces avec filetage 4" permet de connecter ESATTO 3" aux télescopes Meade LX200 SCT, LX200 GPS, LX200-ACF, L...

Afficher tous les détails
$295.00 - $295.00
$295.00
$295.00 - $295.00
$295.00
$255.00 - $255.00
$255.00
$255.00 - $255.00
$255.00

PrimaLuceLab Adaptateur ESATTO 3" pour Sky-Watcher ESPRIT 100 ED

PLL-PL3600288

Adaptateur ESATTO 3" pour SkyWatcher ESPRIT 100 ED.

$255.00 - $255.00
$255.00
$255.00 - $255.00
$255.00
$255.00 - $255.00
$255.00
$255.00 - $255.00
$255.00

PrimaLuceLab Adaptateur ESATTO 3" pour Sky-Watcher ESPRIT 120 ED et 150 ED

PLL-PL3600253

Adaptateur ESATTO 3" pour SkyWatcher ESPRIT 120 ED et 150 ED

$255.00 - $255.00
$255.00
$255.00 - $255.00
$255.00

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.