Passer au contenu

Porte-oculaires

At f/4, the critical focus zone is a few tens of microns. A metal telescope tube contracting through a fifteen-degree Canadian night will move focus well outside that on its own, which is why motorized, temperature-compensated focus stopped being a luxury for imagers. David Astro carries focusers in Canada — manual dual-speed, stepper-driven and fully robotic — in Canadian inventory and shipped domestically.

Fit and load capacity are the two decisions that matter. Tell us your telescope and the weight of your camera train and we will specify the focuser and the mounting adapter together.

Filtres

CA$830.00 - CA$830.00
CA$830.00
CA$830.00 - CA$830.00
CA$830.00

APM Porte-Oculaire de Luxe 3.7" ZTA

APM-37-Deluxe
1 restant!

APM 3.7" Rack and Pinion Deluxe Focuser Le nouveau porte-oculaire 3,7" est de type crémaillère et pignon, avec mise au point 1:10. Il reste rigide ...

Afficher tous les détails
CA$830.00 - CA$830.00
CA$830.00
CA$830.00 - CA$830.00
CA$830.00
Askar Worm-and-Gear Automatic Telescope Focuser (WAF)
CA$279.00 - CA$279.00
CA$279.00
CA$279.00 - CA$279.00
CA$279.00

Askar Worm-and-Gear Automatic Telescope Focuser (WAF)

ASK-ASKARWAF

20 kg Equivalent Load Capacity 0.0182° Minimum Resolution Step Size 1:99 Worm-Gear Stepper Motor Native ASCOM Alpaca & Indigo Support 373 g Bo...

Afficher tous les détails
CA$279.00 - CA$279.00
CA$279.00
CA$279.00 - CA$279.00
CA$279.00
CA$503.00 - CA$503.00
CA$503.00
CA$503.00 - CA$503.00
CA$503.00

Baader Porte-Oculaire Diamond Steeltrack 2" pour Newtoniens

BAA-2957230

Mise au point BDS-NT Baader Diamond Steeltrack® 2" Améliorez pratiquement n'importe quel Newtonien, petit ou grand, avec toute la douceur, la pré...

Afficher tous les détails
CA$503.00 - CA$503.00
CA$503.00
CA$503.00 - CA$503.00
CA$503.00
CA$523.00 - CA$523.00
CA$523.00
CA$523.00 - CA$523.00
CA$523.00

Baader Porte-Oculaire Diamond Steeltrack 2" pour Réfracteurs

BAA-2957210

Mise au point BDS-RT Baader Diamond Steeltrack® 2" Le porte-oculaire 2" Refractor Diamond Steeltrack de Baader Planetarium donne aux réfracteurs ...

Afficher tous les détails
CA$523.00 - CA$523.00
CA$523.00
CA$523.00 - CA$523.00
CA$523.00
CA$532.00 - CA$532.00
CA$532.00
CA$532.00 - CA$532.00
CA$532.00

Baader Porte-Oculair Diamond Steeltrack 2" pour Télescopes SC/HD

BAA-2957220
4 en stock

Mise au point BDS-SC Baader Diamond Steeltrack® 2" Le porte-oculaire SC Diamond Steeltrack 2 "de Baader Planetarium offre à Schmidt-Cassegrains 3...

Afficher tous les détails
CA$532.00 - CA$532.00
CA$532.00
CA$532.00 - CA$532.00
CA$532.00
Explore Scientific 3-inch Self-Centering Focuser
CA$1,190.00 - CA$1,190.00
CA$1,190.00
CA$1,190.00 - CA$1,190.00
CA$1,190.00

Explore Scientific 3-inch Self-Centering Focuser

ES-FOC3

3-inch self-centering draw tube 17 lb (7.7 kg) lifting capacity 9:1 dual-speed focusing system 84.5mm of precision draw tube travel Rotatable back...

Afficher tous les détails
CA$1,190.00 - CA$1,190.00
CA$1,190.00
CA$1,190.00 - CA$1,190.00
CA$1,190.00
Explore Scientific 3-inch Self-Centering Focuser with Back Cell Adapter for FCD100-127-CF
CA$1,400.00 - CA$1,400.00
CA$1,400.00
CA$1,400.00 - CA$1,400.00
CA$1,400.00

Explore Scientific 3-inch Self-Centering Focuser with Back Cell Adapter for FCD100-127-CF

ES-FOC3-BC100127

3-inch Self-Centering Focuser Design 17 lb Lifting Capacity for Heavy Imaging Trains 9:1 Dual-Speed Helical Rack-and-Pinion Mechanism 84.5mm of Pr...

Afficher tous les détails
CA$1,400.00 - CA$1,400.00
CA$1,400.00
CA$1,400.00 - CA$1,400.00
CA$1,400.00
Explore Scientific 3-inch Self-Centering Focuser with Back Cell Adapter for White Tube ED127 and FCD-100
CA$1,400.00 - CA$1,400.00
CA$1,400.00
CA$1,400.00 - CA$1,400.00
CA$1,400.00

Explore Scientific 3-inch Self-Centering Focuser with Back Cell Adapter for White Tube ED127 and FCD-100

ES-FOC3-BC100127T

Designed for Explore Scientific white-tube ED127 and FCD-100 refractors 17 lb instrument lifting capacity Self-centering compression system elimin...

Afficher tous les détails
CA$1,400.00 - CA$1,400.00
CA$1,400.00
CA$1,400.00 - CA$1,400.00
CA$1,400.00
CA$419.99 - CA$419.99
CA$419.99
CA$419.99 - CA$419.99
CA$419.99

Explore Scientific Porte-Oculaire à Crémaillère Série APO EDT

ES-FOCEDAPO-RP

Trouver et maintenir cette mise au point nette parfaite est presque sans effort avec le porte-oculaire à crémaillère d'Explore Scientific. Défini p...

Afficher tous les détails
CA$419.99 - CA$419.99
CA$419.99
CA$419.99 - CA$419.99
CA$419.99
iOptron Electronic Automatic Focuser - iEAF
CA$279.00 - CA$279.00
CA$279.00
CA$279.00 - CA$279.00
CA$279.00

iOptron Electronic Automatic Focuser - iEAF

IOP-8453

5 kg Maximum Payload Capacity High-Precision Stepper Motor Drive Built-in Temperature Sensor for Focus Compensation ASCOM Compatible for Automated...

Afficher tous les détails
CA$279.00 - CA$279.00
CA$279.00
CA$279.00 - CA$279.00
CA$279.00
iOptron iAFS2 - iOptron 2'' Inline Automatic Focuser
CA$643.00 - CA$643.00
CA$643.00
CA$643.00 - CA$643.00
CA$643.00

iOptron iAFS2 - iOptron 2'' Inline Automatic Focuser

IOP-FA20

Supports a maximum payload of 5kg without slippage Delivers 0.6µm focusing resolution for critical imaging Features a 51mm clear aperture for full...

Afficher tous les détails
CA$643.00 - CA$643.00
CA$643.00
CA$643.00 - CA$643.00
CA$643.00
iOptron iAFS3 - 3-inch Inline Automatic Focuser
CA$755.00 - CA$755.00
CA$755.00
CA$755.00 - CA$755.00
CA$755.00

iOptron iAFS3 - 3-inch Inline Automatic Focuser

IOP-FA30

3-inch inline auto focuser with iLock™ technology Supports heavy imaging payloads up to 6kg 68mm clear aperture minimizes vignetting Precise 0.4um...

Afficher tous les détails
CA$755.00 - CA$755.00
CA$755.00
CA$755.00 - CA$755.00
CA$755.00
CA$525.00 - CA$525.00
CA$525.00
CA$525.00 - CA$525.00
CA$525.00

Lunt Porte-Oculaire et Plaque de Support - LS100MT

LSS-BP&F/LS100MT

La plaque arrière et le porte-oculaire Crayford standard pour le LS100MT vous permettent de convertir ce télescope solaire dédié en un télescope p...

Afficher tous les détails
CA$525.00 - CA$525.00
CA$525.00
CA$525.00 - CA$525.00
CA$525.00
CA$517.00 - CA$517.00
CA$517.00
CA$517.00 - CA$517.00
CA$517.00

Lunt Porte-Oculaire et Plaque de Support - LS152T

LSS-LS152T/BP&F

La plaque arrière et le porte-oculaire Crayford standard pour le LS152MT vous permettent de convertir ce télescope solaire dédié en un télescope p...

Afficher tous les détails
CA$517.00 - CA$517.00
CA$517.00
CA$517.00 - CA$517.00
CA$517.00
CA$525.00 - CA$525.00
CA$525.00
CA$525.00 - CA$525.00
CA$525.00

Lunt Porte-Oculaire et Plaque de Support - LS80MT

LSS-BP&F/LS80MT

La plaque arrière et le porte-oculaire Crayford standard pour le LS80MT vous permettent de convertir ce télescope solaire dédié en un télescope pou...

Afficher tous les détails
CA$525.00 - CA$525.00
CA$525.00
CA$525.00 - CA$525.00
CA$525.00
CA$119.00 - CA$119.00
CA$119.00
CA$119.00 - CA$119.00
CA$119.00

Lunt Mini Porte-Oculaire Hélicoïdal - 1.25"

LSS-LSMINI/1.25

Le Lunt Mini est un porte-oculaire hélicoïdal non rotatif qui fournit une connexion filetée T2 (mâle) à T2 (femelle). Le porte-oculaire a une cour...

Afficher tous les détails
CA$119.00 - CA$119.00
CA$119.00
CA$119.00 - CA$119.00
CA$119.00
CA$376.00 - CA$376.00
CA$376.00
CA$376.00 - CA$376.00
CA$376.00

Lunt Solar 1.25" R&P Focuser - Dual Speed

LSS-001-148
1 en stock

1.25" Focuser Size 10:1 Dual-Speed Reduction Fine Focus 6-8 pound (2.7-3.6 kg) Load Capacity 0.5" Draw Tube Travel CNC Machined Aluminum and Brass...

Afficher tous les détails
CA$376.00 - CA$376.00
CA$376.00
CA$376.00 - CA$376.00
CA$376.00
CA$237.00 - CA$237.00
CA$237.00
CA$237.00 - CA$237.00
CA$237.00

Lunt Solar 1.25" R&P Focuser - Single Speed

LSS-001-147

Replaces stock helical focusers on Lunt Solar telescopes 1.25" eyepiece and accessory holder Rack and Pinion mechanism eliminates backlash and ima...

Afficher tous les détails
CA$237.00 - CA$237.00
CA$237.00
CA$237.00 - CA$237.00
CA$237.00
CA$5,033.00 - CA$5,033.00
CA$5,033.00
CA$5,033.00 - CA$5,033.00
CA$5,033.00

Rotateur de mise au point Optec Gemini

OPC-19750

Les ingénieurs d'Optec ont développé un tout nouveau concept pour combiner les fonctions de mise au point du télescope et de rotation de la caméra ...

Afficher tous les détails
CA$5,033.00 - CA$5,033.00
CA$5,033.00
CA$5,033.00 - CA$5,033.00
CA$5,033.00
CA$1,813.00 - CA$2,093.00
CA$1,813.00 - CA$2,093.00
CA$1,813.00 - CA$2,093.00
CA$1,813.00

Optec TCF-Leo porte-oculaire à profil bas

Options available

Les ingénieurs d'Optec ont développé un porte-oculaire de 3 pouces à profil bas, mais extrêmement robuste, pour les installations de télescopes où...

Afficher tous les détails
CA$1,813.00 - CA$2,093.00
CA$1,813.00 - CA$2,093.00
CA$1,813.00 - CA$2,093.00
CA$1,813.00
Orion Optics UK Eris 2" R+P focuser
CA$999.00 - CA$999.00
CA$999.00
CA$999.00 - CA$999.00
CA$999.00

Orion Optics UK Eris 2" R+P focuser

OOUK-ERIS-2-R-P-FOCUSER

2" rack-and-pinion focuser Smooth lock Standard on the IDEAL and VX ranges Description Specifications In the Box Warranty Eris 2" R+P Foc...

Afficher tous les détails
CA$999.00 - CA$999.00
CA$999.00
CA$999.00 - CA$999.00
CA$999.00
PrimaLuceLab ESATTO 2" Focuser with ARCO 2" Rotator
CA$1,987.00 - CA$1,987.00
CA$1,987.00
CA$1,987.00 - CA$1,987.00
CA$1,987.00

PrimaLuceLab ESATTO 2" Focuser with ARCO 2" Rotator

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
CA$1,987.00 - CA$1,987.00
CA$1,987.00
CA$1,987.00 - CA$1,987.00
CA$1,987.00
PrimaLuceLab ESATTO 2" LP Focuser with ARCO 2" Rotator
CA$2,331.00 - CA$2,331.00
CA$2,331.00
CA$2,331.00 - CA$2,331.00
CA$2,331.00

PrimaLuceLab ESATTO 2" LP Focuser with ARCO 2" Rotator

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
CA$2,331.00 - CA$2,331.00
CA$2,331.00
CA$2,331.00 - CA$2,331.00
CA$2,331.00
CA$1,225.00 - CA$1,225.00
CA$1,225.00
CA$1,225.00 - CA$1,225.00
CA$1,225.00

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

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
CA$1,225.00 - CA$1,225.00
CA$1,225.00
CA$1,225.00 - CA$1,225.00
CA$1,225.00

Manual, Motorized and Robotic Focus

All focusers move a drawtube. What separates them is how much they can hold without slipping and how repeatably they can return to a position.

  • Dual-speed manual focusers: Coarse and 10:1 fine focus, entirely adequate for visual observing and for imaging where you are willing to refocus by hand periodically.
  • Stepper motor focusers: Absolute positioning with repeatable steps, enabling automated focus routines and per-filter focus offsets.
  • Robotic microfocusers: High load capacity with integrated temperature sensing and position feedback, designed for unattended operation across a whole night.
  • Load capacity: The specification that matters most for imaging. A camera, filter wheel, off-axis guider and adapters add up quickly, and the load acts as a bending moment when the tube is horizontal.
  • Travel and profile height: A replacement focuser with a taller profile can prevent a telescope reaching focus, particularly on Newtonians. This must be checked before purchase.
  • Temperature compensation: A sensor and coefficient that shift focus automatically as the tube cools, which removes the largest single source of overnight focus drift.

Why Choose David Astro for Focusers

A focuser is a retrofit, and retrofits fail on details that are easy to check beforehand.

  • Focus travel verified: We check that the new focuser's profile still allows your telescope to reach focus with your intended camera or diagonal, which is the most common retrofit failure.
  • Adapter identified: We specify the telescope-specific mounting flange alongside the focuser, so the parts arrive complete.
  • Load calculated with the moment arm: We consider the weight and its distance from the drawtube, not just the total mass.
  • Authorized dealer: Full manufacturer warranty with service handled in Canada.
  • Canadian stock: Ships domestically without duties or brokerage fees for Canadian orders.

Focusers in Canada — Frequently Asked Questions

Do I need an electronic focuser?
For imaging below about f/6, yes in practice. Focus shift with temperature exceeds the critical focus zone over a Canadian night, and refocusing manually every hour costs you exposures and disturbs the rig.
Will a new focuser fit my Newtonian?
Only if its profile height is compatible. A taller focuser can push the focal plane beyond the drawtube's inward travel. Tell us the telescope and we will check before you order.
How much load can a focuser really take?
Rated capacities usually assume the tube pointing up. Near the horizon the same weight acts as a bending moment and effective capacity drops. We size with margin for that.
Can I add temperature compensation later?
On most stepper-based systems, yes — a temperature probe and a measured coefficient are all that is required. We can help determine the coefficient for your specific tube.

Replacing a focuser?

Send us your telescope and imaging train weight and we will specify the focuser and flange. Ships from our Canadian warehouse.