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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.

Accessoires optiques

Optical accessories are what turn one telescope into several. The same optical tube can be a wide-field imaging refractor, a high-power planetary instrument or a comfortable binocular-view visual scope depending on what you put behind it. David Astro carries a deep selection of eyepieces, diagonals, Barlows, reducers, flatteners, binoviewers and correctors in Canada, held in Canadian stock.

Our team uses this equipment on our own telescopes, so the advice you get is based on what actually works at a given focal ratio and under a given sky, not on a spec sheet. If you are deciding between two focal lengths or wondering whether a corrector will help your optic, ask us before you order.

Filtres

William Optics M48 Filter Adapters for Cat Eyes Binoculars
$9.00 - $9.00
$9.00
$9.00 - $9.00
$9.00

William Optics M48 Filter Adapters for Cat Eyes Binoculars

WO-AD-2X42-M48

Enables use of standard 2-inch (M48 x 0.75) filters Connects to the M44.5 x 0.75 objective threads on Cat Eyes Binoculars Adds a minimal 6 mm of o...

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$9.00 - $9.00
$9.00
$9.00 - $9.00
$9.00
$159.00 - $159.00
$159.00
$159.00 - $159.00
$159.00

William Optics Prisme Érecteur pour RedCat - Version Argent 1.25"

WO-D-EP90-125-RC51III
1 en stock

Prisme érigé de 1,25" pour une orientation correcte de l'image Conception à finition argentée spécialement conçue pour les télescopes Red...

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$159.00 - $159.00
$159.00
$159.00 - $159.00
$159.00
$108.00 - $108.00
$108.00
$108.00 - $108.00
$108.00

William Optics Oculaire SPL 55° 12,5mm - 1.25"

WO-E-SPL12.5

Oculaire de 1,25 pouces avec champ de vision apparent de 55° Distance focale de 12,5 mm pour une visualisation à grossissement moyen-élev...

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$108.00 - $108.00
$108.00
$108.00 - $108.00
$108.00
$478.00 - $478.00
$478.00
$478.00 - $478.00
$478.00

William Optics Filtre Bande Étroite STC Astro Duo

WO-YF-STC-ADN

Filtre passe-bande double pour l'astrophotographie Optimisé pour les raies d'émission H-alpha et OIII Description ...

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$478.00 - $478.00
$478.00
$478.00 - $478.00
$478.00
$238.00 - $238.00
$238.00
$238.00 - $238.00
$238.00

William Optics Filtre Multispectre STC Ultra Layer Astro - 48mm

WO-YF-STC-M48

Filtre passe-bande multi pour l'astrophotographie Conception filetée de 48 mm pour une fixation facile Description ...

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$238.00 - $238.00
$238.00
$238.00 - $238.00
$238.00
$156.00 - $156.00
$156.00
$156.00 - $156.00
$156.00

William Optics Oculaire SWAN 72° 40mm - 2"

WO-E-SWA40
4 en stock

Oculaire de 2 pouces avec champ de vision apparent de 72° Distance focale de 40 mm pour une visualisation à grand champ et à faible gross...

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$156.00 - $156.00
$156.00
$156.00 - $156.00
$156.00
William Optics Ultra Flat 132 (0.79x Reducer)
$1,068.00 - $1,068.00
$1,068.00
$1,068.00 - $1,068.00
$1,068.00

William Optics Ultra Flat 132 (0.79x Reducer)

WO-P-FLAT-132

Reduces focal ratio by a factor of 0.79x Provides a flat field for Full Frame, APS-C, and M4/3 sensors 3-element, 3-group optical design Connects ...

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$1,068.00 - $1,068.00
$1,068.00
$1,068.00 - $1,068.00
$1,068.00
William Optics Ultra Flat 156 (0.79x Reducer)
$1,068.00 - $1,068.00
$1,068.00
$1,068.00 - $1,068.00
$1,068.00

William Optics Ultra Flat 156 (0.79x Reducer)

WO-P-FLAT-156

Reduces focal ratio by a factor of 0.79x Designed for Medium Format, Full Frame, and APS-C sensors 3-element, 3-group optical design Requires 75.5...

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$1,068.00 - $1,068.00
$1,068.00
$1,068.00 - $1,068.00
$1,068.00
$806.00 - $806.00
$806.00
$806.00 - $806.00
$806.00

William Optics Aplanisseur / Réducteur 0.72x FLAT8

WO-P-FLAT8

Réducteur/aplatisseur 0,72x pour télescopes réfracteurs William Optics Réduit la distance focale et corrige la courbure du champ pour une...

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$806.00 - $806.00
$806.00
$806.00 - $806.00
$806.00
$788.00 - $788.00
$788.00
$788.00 - $788.00
$788.00

William Optics Aplanisseur / Réducteur 0.8x FLAT7A

WO-P-FLAT7A

Réducteur/aplatisseur 0,8x pour télescopes réfracteurs William Optics Réduit la distance focale tout en corrigeant la courbure du champ ...

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$788.00 - $788.00
$788.00
$788.00 - $788.00
$788.00
$22.00 - $22.00
$22.00
$22.00 - $22.00
$22.00

ZWO Objectif 1/3"2.1mm 150°

ZWO-LENS-2.1
4 en stock

Objectif ZWO 1/3″ 2.1mm 150 degrés Paramètre technique: Prise en charge des formats : capteur 1/3″ Focale : 2,1 mm Ange large : 150 degrés Mo...

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$22.00 - $22.00
$22.00
$22.00 - $22.00
$22.00
$22.00 - $22.00
$22.00
$22.00 - $22.00
$22.00

ZWO Lentille 2.5mm 170°

ZWO-LENS-2-5
5 en stock

Objectif ZWO 2,5 mm à 170 degrés Paramètre technique: Prise en charge des formats : capteur 1/2″ Focale : 2,5 mm Grand ange : 170 degrés Modèl...

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$22.00 - $22.00
$22.00
$22.00 - $22.00
$22.00
$19.00 - $49.00
$19.00 - $49.00
$19.00 - $49.00
$19.00

ZWO Fenêtre de Protection AR

Options available
5 variants in stock

Fenêtre de protection AR Fenêtre de protection ZWO D21 AR Paramètre technique: Diamètre : 21 mm Type : fenêtre AR Épaisseur : 1,1 mm Plan...

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$19.00 - $49.00
$19.00 - $49.00
$19.00 - $49.00
$19.00
$149.00 - $149.00
$149.00
$149.00 - $149.00
$149.00

Correcteur de dispersion atmosphérique ZWO

ZWO-ADC
8 en stock

ZWO ADC est élu « HOT SKY PRODUCT - 2017 » par le magazine SKY&TELESCOPE ! Caractéristiques

$149.00 - $149.00
$149.00
$149.00 - $149.00
$149.00
$99.00 - $99.00
$99.00
$99.00 - $99.00
$99.00

ZWO Filtre Méthane CH4 - 20nm 1.25"

ZWO-CH4
3 en stock

Le filtre à bande ZWO Methane (CH4) est un filtre spécial pour une utilisation photographique. Son FWHM est de 20 nm, ce qui convient à la plupa...

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$99.00 - $99.00
$99.00
$99.00 - $99.00
$99.00
$38.00 - $38.00
$38.00
$38.00 - $38.00
$38.00

ZWO Objectif CS 2.8mm-12mm F1.4

ZWO-LENS-2.8-12
5 en stock

L'objectif 2.8mm-12mm F1.4 convient aux modèles ASI120MM/MC, ASI290MM/MC et ASI224MC Cet objectif a un diamètre plus grand que l'objectif de 2,1 ...

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$38.00 - $38.00
$38.00
$38.00 - $38.00
$38.00
$99.00 - $169.00
$99.00 - $169.00
$99.00 - $169.00
$99.00

ZWO Filtre Duo-Band

Options available
7 variants in stock

Le filtre ZWO Duo-Band est un filtre double bande étroite principalement destiné à compléter notre gamme de caméras ASI couleur. Le filtre Duo-Ban...

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$99.00 - $169.00
$99.00 - $169.00
$99.00 - $169.00
$99.00
Épuisé
$309.00 - $309.00
$309.00
$309.00 - $309.00
$309.00

ZWO Réducteur universel FF107/FF130 APO 0,7×

ZWO-F107130RE

Réduit le rapport focal des FF107APO et FF130APO Rapport focal réduit à f/4,9 Réduit la distance focale à 524 mm Facteur de ...

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$309.00 - $309.00
$309.00
$309.00 - $309.00
$309.00
Épuisé
$199.00 - $199.00
$199.00
$199.00 - $199.00
$199.00

Réducteur plein format ZWO FF65 APO 0,75×

ZWO-F65RE
1 restant!

Réduit le rapport focal du FF65APO Rapport focal de f/6,4 à f/4,8 Réduit la distance focale à 312 mm Facteur de réduction de 0,75x Mise au point a...

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$199.00 - $199.00
$199.00
$199.00 - $199.00
$199.00
$249.00 - $249.00
$249.00
$249.00 - $249.00
$249.00

ZWO Réducteur plein format FF80 APO 0,76×

ZWO-F80RE
1 restant!

Réduit le rapport focal du FF80APO Rapport focal de f/7,5 à f/5,7 Réduit la distance focale à 456 mm Facteur de réduction de...

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$249.00 - $249.00
$249.00
$249.00 - $249.00
$249.00
$12.00 - $15.00
$12.00 - $15.00
$12.00 - $15.00
$12.00

ZWO Masques à Fitlres

Options available
5 variants in stock

Les masques filtrants ZWO sont utilisés pour les roues filtrantes ZWO. Veuillez utiliser les vis M2 et les masques pour fixer les filtres : ⚫ ...

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$12.00 - $15.00
$12.00 - $15.00
$12.00 - $15.00
$12.00
$29.00 - $29.00
$29.00
$29.00 - $29.00
$29.00

ZWO Filtre Passe-Bande IR 850nm - 1.25"

ZWO-850IR1-25
2 en stock

Filtre de passage ZWO 1.25″ IR 850nm adapté aux caméras sensibles aux infrarouges. Vous n'avez pas besoin de débayer et d'obtenir la pleine résolut...

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$29.00 - $29.00
$29.00
$29.00 - $29.00
$29.00
$19.00 - $19.00
$19.00
$19.00 - $19.00
$19.00

ZWO Fenêtre de Protection IR-Cut

Options available
1 variants in stock

Fenêtre de protection UV IR-CUT Fenêtre de protection ZWO D21 UV IR-CUT Paramètre technique: Diamètre : 21 mm Type: fenêtre UV IR-cut Épai...

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$19.00 - $19.00
$19.00
$19.00 - $19.00
$19.00
$148.00 - $299.00
$148.00 - $299.00
$148.00 - $299.00
$148.00

Filtres optimisés ZWO LRGB

Options available
3 variants in stock

Les nouveaux filtres ZWO LRGB sont conçus pour égaliser approximativement le flux du capteur mono ASI1600 Meilleure transmission, meilleur revête...

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$148.00 - $299.00
$148.00 - $299.00
$148.00 - $299.00
$148.00

Choosing Optical Accessories That Match Your Telescope

Every accessory in this collection modifies the light cone before it reaches your eye or sensor. The right choice depends almost entirely on your telescope's focal ratio, focal length and back-focus budget.

  • Eyepieces: Focal length sets magnification against your telescope's focal length; apparent field and eye relief determine how comfortable that magnification is to use.
  • Diagonals: Dielectric mirrors typically exceed 99% reflectivity; prisms can outperform them at f/10 and slower on planetary targets but introduce chromatic effects in fast refractors.
  • Barlow lenses and extenders: Multiply focal length for planetary work and push the focal plane outward, which is often the cheapest fix for a scope that will not reach focus with a diagonal.
  • Field flatteners and reducers: Correct field curvature and coma across large sensors; each has a fixed back-focus that must be hit precisely.
  • Binoviewers: Two-eye viewing that dramatically improves perceived detail on the Moon and planets, at the cost of significant added optical path.
  • Finders and reflex sights: Acquisition optics — the accessory most often skipped and most often missed.

Why Choose David Astro for Optical Accessories

Optics are easy to buy badly. A well-reviewed eyepiece can still be the wrong eyepiece for your focal ratio, exit pupil or sky.

  • Focal length guidance: We help you build a spaced eyepiece set rather than three focal lengths that overlap, and we calculate exit pupil against your aperture and typical seeing.
  • Corrector matching: We confirm that a flattener or reducer is designed for your telescope's focal ratio before you buy, since a mismatched corrector degrades a field rather than fixing it.
  • Authorized dealer: Full manufacturer warranty and verified authenticity on everything we list.
  • Canadian stock: In-stock optics ship from Canada, with no surprise duties or brokerage fees for Canadian customers.
  • Service and support after the sale: In-house diagnostics if something is not performing as expected.

Optical Accessories in Canada — Frequently Asked Questions

Will a premium eyepiece improve a modest telescope?
Usually yes at the edges of the field, especially in fast telescopes below f/6 where simpler designs struggle. On the axis at f/10, the difference between a good eyepiece and a premium one is much smaller.
How do I know if I need a flattener or a reducer?
A flattener corrects curvature at the same focal length. A reducer also shortens focal length, widening the field and speeding the system. If your stars are elongated only in the corners, you need a flattener; if you also want more field, a reducer.
Do binoviewers work in every telescope?
They add roughly 100 mm or more of optical path, so most refractors need a corrector or a Barlow-style element to reach focus. Schmidt-Cassegrains generally accommodate them without modification.
Is everything shipped domestically?
Yes. Anything shown as in stock is held in Canada and ships without customs delays for Canadian orders.

Match the accessory to the optic

Tell us your telescope and what you want to see, and we will recommend the right combination. Ships from Canada.