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IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.
IMPORTANT: Our store is located in Canada. All orders that include products manufactured outside of Canada or USA will be subject to tariffs and duties, regardless of the order value. US customers are responsible for all applicable duties and tariffs, and those will be billed by the carrier, except for the Lacerta upgrade kit, for which we collect them at checkout.

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

$250.00 - $250.00
$250.00
$250.00 - $250.00
$250.00

Starlight Instruments Adaptateur pour Sky-Watcher Esprit 100mm

SI-A30-1903-102

Adaptateur de tube spécifique pour les télescopes SkyWatcher Esprit 100 mm. En ce qui concerne le placement de l'optique, toute course plus long...

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$250.00 - $250.00
$250.00
$250.00 - $250.00
$250.00
$40.00 - $40.00
$40.00
$40.00 - $40.00
$40.00

Starlight Instruments Circuit Imprimé pour contrôler 2 Porte-Oculaires simultanément

SI-FB-II 2nd FOCUSER

Cette mise à niveau vous permet de contrôler 2 focusers simultanément. Si vous n'avez pas déjà un 2e moteur, vous devrez acheter un 2e moteur pour...

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$40.00 - $40.00
$40.00
$40.00 - $40.00
$40.00
$110.00 - $110.00
$110.00
$110.00 - $110.00
$110.00

Starlight Instruments Adaptateur pour Oculaires pour Réducteur de Focale 0.63x Celestron/Meade

SI-EA20-2.24
1 en stock

Adaptateur d'oculaire pour réducteur de focale Celestron/Meade 6.3. Cet adaptateur d'oculaire est utilisé pour fixer le réducteur de focale Celestr...

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$110.00 - $110.00
$110.00
$110.00 - $110.00
$110.00
$610.00 - $640.00
$610.00 - $640.00
$610.00 - $640.00
$610.00

Starlight Instruments Porte-Oculaire à Crémaillère 2.5" Feather Touch

Options available

Vous aurez besoin d'une bague d'adaptation de tube et d'un embout pour installer ce porte-oculaire sur votre télescope. Vous avez également la poss...

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$610.00 - $640.00
$610.00 - $640.00
$610.00 - $640.00
$610.00
$630.00 - $660.00
$630.00 - $660.00
$630.00 - $660.00
$630.00

Starlight Instruments Porte-Oculaire à Crémaillère 3.0" Feather Touch

Options available

Vous aurez besoin d'une bague d'adaptation de tube et d'un embout pour installer ce porte-oculaire sur votre télescope. Vous avez également la poss...

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$630.00 - $660.00
$630.00 - $660.00
$630.00 - $660.00
$630.00
$960.00 - $980.00
$960.00 - $980.00
$960.00 - $980.00
$960.00

Starlight Instruments Porte-Oculaire à Crémaillère 3.5" Feather Touch

Options available

Vous aurez besoin d'une bague d'adaptation de tube et d'un embout pour installer ce porte-oculaire sur votre télescope. Vous avez également la poss...

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$960.00 - $980.00
$960.00 - $980.00
$960.00 - $980.00
$960.00
$1,260.00 - $1,260.00
$1,260.00
$1,260.00 - $1,260.00
$1,260.00

Starlight Instruments Porte-Oculaire à Crémaillère 3.5" Feather Touch pour FSQ-106

SI-FTF3515-TAK FSQ106ED

Feather Touch 3,5 "" Diamètre Double vitesse de mise au point qui a un tube de tirage usiné sur mesure avec des filetages femelles M98X1. Ce porte...

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$1,260.00 - $1,260.00
$1,260.00
$1,260.00 - $1,260.00
$1,260.00
$1,245.00 - $1,275.00
$1,245.00 - $1,275.00
$1,245.00 - $1,275.00
$1,245.00

Starlight Instruments Porte-Oculaire Motorisé à Crémaillère 3.0" Feather Touch Gen II

Options available

La mise au point est livrée avec le kit de mise au point électronique Starlight Instruments, le système de moteur Posi Drive (PDMS) et une mise à n...

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$1,245.00 - $1,275.00
$1,245.00 - $1,275.00
$1,245.00 - $1,275.00
$1,245.00
$350.00 - $350.00
$350.00
$350.00 - $350.00
$350.00

Starlight Instruments Feather Touch Micro pour Celestron 6" Evolution

SI-FTM-C6 Evolution

Toucher plume Mise au point du micro télescope pour télescope Celestron 6 "" Evolution Schmidt-Cassegrain. Ce porte-oculaire fonctionnera également...

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$350.00 - $350.00
$350.00
$350.00 - $350.00
$350.00
$370.00 - $370.00
$370.00
$370.00 - $370.00
$370.00

Starlight Instruments Feather Touch Micro pour Celestron C14 SCT

SI-FTM-C14

Toucher plume Mise au point du micro télescope pour télescope Celestron C-14 Schmidt-Cassegrain Compatible avec : Celestrron C-14 Schmidt-Cassegra...

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$370.00 - $370.00
$370.00
$370.00 - $370.00
$370.00
$360.00 - $360.00
$360.00
$360.00 - $360.00
$360.00

Starlight Instruments Feather Touch Micro pour Celestron C9.25 SCT

SI-FTM-C9.25

Toucher plume Mise au point du micro télescope pour télescope Celestron C-9.25 Schmidt-Cassegrain Si votre télescope a moins de quelques années, vé...

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$360.00 - $360.00
$360.00
$360.00 - $360.00
$360.00
$350.00 - $350.00
$350.00
$350.00 - $350.00
$350.00

Starlight Instruments Feather Touch Micro pour Celestron CPC11, C11 Edge HD, RASA 11" SCT

SI-FTM-CPC11

Toucher plume Mise au point du micro télescope pour télescope Celestron CPC-11 Schmidt-Cassegrain Si votre télescope a moins de quelques années, v...

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$350.00 - $350.00
$350.00
$350.00 - $350.00
$350.00
$350.00 - $350.00
$350.00
$350.00 - $350.00
$350.00

Starlight Instruments Feather Touch Micro pour Celestron CPC800/RASA 8", NexStar 6SE, C8Edge HD 8SE SCT et Sky-Watcher 150/180mm Mak

SI-FTM-CPC8

Pour le Celestron 6SE, vous devrez mesurer le diamètre extérieur de la bride du porte-oculaire d'origine (la partie du porte-oculaire d'origine qui...

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$350.00 - $350.00
$350.00
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$350.00
$360.00 - $360.00
$360.00
$360.00 - $360.00
$360.00

Starlight Instruments Feather Touch Micro pour Celestron CPC9.25, C9.25 Edge HD, SCT

SI-FTM-CPC9.25

Toucher plume Mise au point du micro télescope pour télescope Celestron CPC-9.25 Schmidt-Cassegrain Si votre télescope a moins de quelques années...

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$360.00 - $360.00
$360.00
$360.00 - $360.00
$360.00
$350.00 - $350.00
$350.00
$350.00 - $350.00
$350.00

Starlight Instruments Feather Touch Micro pour Celestron C11 SCT (NOT CPC1100)

SI-FTM-C11

Toucher plume Micro pour télescope Celestron C-11 Schmidt-Cassegrain (PAS CPC1100) Si votre télescope a moins de quelques années, vérifiez le styl...

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$350.00 - $350.00
$350.00
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$350.00
$370.00 - $370.00
$370.00
$370.00 - $370.00
$370.00

Starlight Instruments Feather Touch Micro pour Celestron C14 Edge HD SCT

SI-FTM-C14HD

Toucher plume Micro pour télescope Celestron C-14 Edge HD Schmidt-Cassegrain. Les instructions d'installation du microfocus Feather Touch pour le ...

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$370.00 - $370.00
$370.00
$370.00 - $370.00
$370.00
$350.00 - $350.00
$350.00
$350.00 - $350.00
$350.00

Starlight Instruments Feather Touch Micro pour Celestron C8 (NOT CPC/NexStar SE)

SI-FTM-C8

Toucher plume Micro pour Celestron C-8 (PAS CPC/NexStar SE) Si votre télescope a moins de quelques années, vérifiez le style de la cellule arrière ...

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$350.00 - $350.00
$350.00
$350.00 - $350.00
$350.00
$350.00 - $350.00
$350.00
$350.00 - $350.00
$350.00

Starlight Instruments Feather Touch Micro pour Meade 14.0" SCTs

SI-FTM-M14

Toucher plume Micro pour Meade 14.0"" Télescopes Schmidt-Cassegrain Cliquez ici pour voir les instructions d'installation Caractéristiques ...

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$350.00 - $350.00
$350.00
$350.00 - $350.00
$350.00
$350.00 - $350.00
$350.00
$350.00 - $350.00
$350.00

Starlight Instruments Feather Touch Micro pour Meade 8.0" SCT (Including Meade LX90, LX200GPS, LX200 Classics & 7" Mak)

SI-FTM-M8

Toucher plume Micro pour télescope Meade 8.0"" Schmidt-Cassegrain (y compris LX90, LX200GPS et LX200 Classics, Meade 7"" LX200GPS, Meade LX50 et Me...

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$350.00 - $350.00
$350.00
$350.00 - $350.00
$350.00
$350.00 - $350.00
$350.00
$350.00 - $350.00
$350.00

Starlight Instruments Feather Touch Micro pour Meade f/10 10" or 12" SCTs

SI-FTM-M1012

Toucher plume Micro pour télescopes Meade 10"" ou 12"" Schmidt-Cassegrain Ce porte-oculaire ne convient qu'aux télescopes F10 Meade 10""&12"" ...

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$350.00 - $350.00
$350.00
$350.00 - $350.00
$350.00
$440.00 - $440.00
$440.00
$440.00 - $440.00
$440.00

Starlight Instruments Feather Touch Micro pour Meade f/8 10" or 12" SCTs

SI-FTM-M1012-F8

Toucher plume Micro pour télescopes Meade F8 10"" ou 12"" Schmidt-Cassegrain. Ce porte-oculaire ne convient pas aux télescopes F10 Meade 10"" et ...

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$440.00 - $440.00
$440.00
$440.00 - $440.00
$440.00
$280.00 - $480.00
$280.00 - $480.00
$280.00 - $480.00
$280.00

Starlight Instruments Porte-Oculaire Crayford Feather Touch 1.25" - Rotatif

Options available

Le tube de tirage est fileté avec un filetage en T pour faciliter la fixation des caméras et des accessoires, ce qui est un must absolu pour l'imag...

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$280.00 - $480.00
$280.00 - $480.00
$280.00 - $480.00
$280.00
$570.00 - $590.00
$570.00 - $590.00
$570.00 - $590.00
$570.00

Starlight Instruments Porte-Oculaire Crayford Feather Touch 2.0" - Rotatif

Options available

Le porte-oculaire pour Borg (FTF2008B-57MM) nécessite 2 pièces n° 7459 d'AstroHutech, 1 du côté visuel du tube de tirage et 1 du côté lunette du t...

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$570.00 - $590.00
$570.00 - $590.00
$570.00 - $590.00
$570.00
$690.00 - $690.00
$690.00
$690.00 - $690.00
$690.00

Starlight Instruments Porte-Oculaire à Crémaillère Feather Touch 2.0" - Rotatif

SI-FTF2015BCR-RP

Toucher plume Crémaillère/Pignon de 2.0"" de Diamètre Double vitesse, débattement du tube de tirage de 1,5 "", frein et anneau de compression. Le p...

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$690.00 - $690.00
$690.00
$690.00 - $690.00
$690.00

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.