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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

PrimaLuceLab Adapter ESATTO 3" for Skywatcher ESPRIT 80 ED
$199.00 - $199.00
$199.00
$199.00 - $199.00
$199.00

PrimaLuceLab Adapter ESATTO 3" for Skywatcher ESPRIT 80 ED

PLL-PL3600643

Connects ESATTO 3" focuser to Skywatcher ESPRIT 80 ED telescopes Replaces the stock focuser for a high-precision upgrade Provides a secure, non-fl...

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$199.00 - $199.00
$199.00
$199.00 - $199.00
$199.00
$95.00 - $95.00
$95.00
$95.00 - $95.00
$95.00

Adaptateur PrimaLuceLab ESATTO 3" pour Takahashi FSQ85

PLL-PL3600271

Si vous recherchez la mise au point motorisée la plus précise pour Takahashi FSQ85, cet adaptateur vous permet de connecter ESATTO 3" à ce télesco...

Afficher tous les détails
$95.00 - $95.00
$95.00
$95.00 - $95.00
$95.00
$115.00 - $115.00
$115.00
$115.00 - $115.00
$115.00

Adaptateur PrimaLuceLab ESATTO 3" pour télescopes Takahashi avec filetage M72

PLL-PL3600245

Grâce à son profil bas, l'ESATTO 3" est le porte-oculaire motorisé parfait pour les télescopes Takahashi avec filetage M72. En ajoutant l'adaptate...

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$115.00 - $115.00
$115.00
$115.00 - $115.00
$115.00
$295.00 - $295.00
$295.00
$295.00 - $295.00
$295.00

Adaptateur PrimaLuceLab ESATTO 3" pour Takahashi TSA 120

PLL-PL3600296

Si vous recherchez la mise au point motorisée la plus précise pour Takahashi TSA120, cet adaptateur vous permet de connecter ESATTO 3" à ce télesc...

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$295.00 - $295.00
$295.00
$295.00 - $295.00
$295.00
PrimaLuceLab Adapter ESATTO 3,5" LP for telescopes with SC thread
$95.00 - $95.00
$95.00
$95.00 - $95.00
$95.00

PrimaLuceLab Adapter ESATTO 3,5" LP for telescopes with SC thread

PLL-PL3600366

Connects ESATTO 3.5" LP focuser to standard SC threads Low-profile design to preserve back focus All-metal construction for a rigid, flex-free con...

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$95.00 - $95.00
$95.00
$95.00 - $95.00
$95.00
PrimaLuceLab Adapter ESATTO 3,5” LP for ARCO 3"
$95.00 - $95.00
$95.00
$95.00 - $95.00
$95.00

PrimaLuceLab Adapter ESATTO 3,5” LP for ARCO 3"

PLL-PL3600467

Connects ESATTO 3.5” LP Focuser to ARCO 3" Rotator Adds Only 3mm of Optical Thickness Enables Unified Control Through ESATTO Port Creates a Rigid,...

Afficher tous les détails
$95.00 - $95.00
$95.00
$95.00 - $95.00
$95.00
PrimaLuceLab Adapter ESATTO 3,5” LP for OfficinaStellare Veloce RH200
$195.00 - $195.00
$195.00
$195.00 - $195.00
$195.00

PrimaLuceLab Adapter ESATTO 3,5” LP for OfficinaStellare Veloce RH200

PLL-PL3600365

Connects ESATTO 3.5" LP focuser to Officina Stellare Veloce RH200 telescopes Designed to maintain optimal backfocus for imaging accessories Provid...

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$195.00 - $195.00
$195.00
$195.00 - $195.00
$195.00
PrimaLuceLab Adapter ESATTO 3,5” LP for OfficinaStellare Veloce RH300
$295.00 - $295.00
$295.00
$295.00 - $295.00
$295.00

PrimaLuceLab Adapter ESATTO 3,5” LP for OfficinaStellare Veloce RH300

PLL-PL3600361

Connects ESATTO 3.5” LP Focuser to Officina Stellare Veloce RH300 Engineered for a precise, rigid, and perfectly aligned connection Maintains corr...

Afficher tous les détails
$295.00 - $295.00
$295.00
$295.00 - $295.00
$295.00
PrimaLuceLab Adapter ESATTO 3,5” LP for PlaneWave DeltaRho 350
$295.00 - $295.00
$295.00
$295.00 - $295.00
$295.00

PrimaLuceLab Adapter ESATTO 3,5” LP for PlaneWave DeltaRho 350

PLL-PL3600386

Connects ESATTO 3.5" LP Focuser to PlaneWave DeltaRho 350 Telescopes Engineered for a Rigid, No-Flex Connection Maintains Precise Optical Train Al...

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$295.00 - $295.00
$295.00
$295.00 - $295.00
$295.00
PrimaLuceLab Adapter ESATTO 3.5" LP for GSO/Orion/TPO Ritchey-Chretien 10, 12, 14 and 16 inches
$125.00 - $125.00
$125.00
$125.00 - $125.00
$125.00

PrimaLuceLab Adapter ESATTO 3.5" LP for GSO/Orion/TPO Ritchey-Chretien 10, 12, 14 and 16 inches

PLL-PL3600367

Connects ESATTO 3.5" LP Focuser to Large RC Telescopes Telescope-Side Thread: M117x1 Female Compatible with 10", 12", 14", and 16" GSO/Orion/TPO R...

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$125.00 - $125.00
$125.00
$125.00 - $125.00
$125.00
$95.00 - $95.00
$95.00
$95.00 - $95.00
$95.00

Adaptateur PrimaLuceLab ESATTO 3.5" LP pour télescopes avec filetage SC Large 3.3"

PLL-PL3600362

L'adaptateur ESATTO 3,5" LP pour télescopes avec un grand filetage SC de 3,3" vous permet de connecter l'ESATTO 3,5" LP aux modèles Celestron SCT ...

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$95.00 - $95.00
$95.00
$95.00 - $95.00
$95.00
PrimaLuceLab Adapter ESATTO 4" for ARCO 2"
$89.00 - $89.00
$89.00
$89.00 - $89.00
$89.00

PrimaLuceLab Adapter ESATTO 4" for ARCO 2"

PLL-PL3600423

Connects ARCO 2" Rotator to ESATTO 4" Focuser Enables Rotator Control via ESATTO Port Creates a Rigid, Integrated Imaging Train Designed for the P...

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$89.00 - $89.00
$89.00
$89.00 - $89.00
$89.00
PrimaLuceLab Adapter ESATTO 4" for ARCO 3"
$145.00 - $145.00
$145.00
$145.00 - $145.00
$145.00

PrimaLuceLab Adapter ESATTO 4" for ARCO 3"

PLL-PL3600459

Connects PrimaLuceLab ESATTO 4" Focuser to ARCO 3" Rotator Enables single-port power and data for the ARCO 3" Creates a rigid, secure connection f...

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$145.00 - $145.00
$145.00
$145.00 - $145.00
$145.00
$235.00 - $235.00
$235.00
$235.00 - $235.00
$235.00

Adaptateur PrimaLuceLab ESATTO 4" pour Officina Stellare ProRC, RiDK, RiFAst

PLL-PL3600326

L'adaptateur ESATTO 4" pour Officina Stellare ProRC, RiDK, RiFAst vous permet d'installer le porte-oculaire ESATTO 4" sur les télescopes ProRC, Ri...

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$235.00 - $235.00
$235.00
$235.00 - $235.00
$235.00
$165.00 - $165.00
$165.00
$165.00 - $165.00
$165.00

Adaptateur PrimaLuceLab ESATTO 4" pour Takahashi FSQ-106

PLL-PL3600310

L'adaptateur ESATTO 4" pour Takahashi FSQ-106 vous permet d'installer ESATTO 4" à la place du porte-oculaire Takahashi d'origine. Cet adaptateur ...

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 4" pour Takahashi FSQ-106EDXIV

PLL-PL3600324

L'adaptateur ESATTO 4" pour Takahashi FSQ-106EDXIV vous permet d'installer ESATTO 4" à la place du porte-oculaire Takahashi d'origine. Cet adaptat...

Afficher tous les détails
$165.00 - $165.00
$165.00
$165.00 - $165.00
$165.00
PrimaLuceLab Adapter ESATTO 4" for Takahashi TOA130
$195.00 - $195.00
$195.00
$195.00 - $195.00
$195.00

PrimaLuceLab Adapter ESATTO 4" for Takahashi TOA130

PLL-PL3600380

Description FAQ Specifications In the Box Warranty Adapter ESATTO 4" for Takahashi TOA130 The PrimaLuceLab Adapter for...

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$195.00 - $195.00
$195.00
$195.00 - $195.00
$195.00
PrimaLuceLab Black color bushing long for SESTO SENSO 2 adapters
$16.00 - $16.00
$16.00
$16.00 - $16.00
$16.00

PrimaLuceLab Black color bushing long for SESTO SENSO 2 adapters

PLL-PL3600117

Upgrade Path Solution: Enables the use of first-generation SESTO SENSO adapters with the SESTO SENSO 2 motor. Cost-Effective Retrofit: Eliminate...

Afficher tous les détails
$16.00 - $16.00
$16.00
$16.00 - $16.00
$16.00
$29.00 - $29.00
$29.00
$29.00 - $29.00
$29.00

Base de recherche PrimaLuceLab DX

PLL-PLLBACEDX
4 en stock

La base de recherche DX peut être installée sur de nombreux télescopes pour vous permettre d'installer des supports de recherche de nombreuses m...

Afficher tous les détails
$29.00 - $29.00
$29.00
$29.00 - $29.00
$29.00
PrimaLuceLab ESATTO 2" Focuser with ARCO 2" Rotator
$1,419.00 - $1,419.00
$1,419.00
$1,419.00 - $1,419.00
$1,419.00

PrimaLuceLab ESATTO 2" Focuser with ARCO 2" Rotator

PLL-PLLEST2ARCO2

Combines robotic focuser and high-precision rotator in one unit Low-profile design for minimal back focus consumption Single-cable connection betw...

Afficher tous les détails
$1,419.00 - $1,419.00
$1,419.00
$1,419.00 - $1,419.00
$1,419.00
PrimaLuceLab ESATTO 2" LP Focuser with ARCO 2" Rotator
$1,665.00 - $1,665.00
$1,665.00
$1,665.00 - $1,665.00
$1,665.00

PrimaLuceLab ESATTO 2" LP Focuser with ARCO 2" Rotator

PLL-PLLEST2LPARCO2

Combines ESATTO 2" LP robotic focuser and ARCO 2" robotic rotator Low-profile design for compact imaging trains Unified power and data connection ...

Afficher tous les détails
$1,665.00 - $1,665.00
$1,665.00
$1,665.00 - $1,665.00
$1,665.00
$875.00 - $875.00
$875.00
$875.00 - $875.00
$875.00

PrimaLuceLab ESATTO 2" LP porte-oculaire robotique à profil bas

PLL-PLLEST2LP-B

ESATTO 2" LP est le porte-oculaire robotique à profil bas le plus compact spécialement conçu pour les télescopes à faible backfocus et il peut égal...

Afficher tous les détails
$875.00 - $875.00
$875.00
$875.00 - $875.00
$875.00
$875.00 - $875.00
$875.00
$875.00 - $875.00
$875.00

PrimaLuceLab ESATTO 2" LP Low Profile Robotic Focuser

PLL-PLLEST2LP

32mm low-profile thickness 50.9mm clear aperture 10mm of precise focuser travel 0.03 microns per step resolution 5kg payload capacity Descripti...

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$875.00 - $875.00
$875.00
$875.00 - $875.00
$875.00
Économisez 10% Économisez %
$675.00
$675.00 - $675.00
$675.00
$607.50
$607.50 - $607.50
$607.50

PrimaLuceLab ESATTO 2" Microfocus robotique

PLL-PLLEST2

Vous souhaitez changer votre porte-oculaire d'origine car il n'est pas assez solide et manque de précision ? Vous souhaitez améliorer la mise au p...

Afficher tous les détails
$675.00
$675.00 - $675.00
$675.00
$607.50
$607.50 - $607.50
$607.50
Économisez 10% Économisez %

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.