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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

$181.00 - $181.00
$181.00
$181.00 - $181.00
$181.00

APM Renvoi Coudé Diélectrique - 2"

APM-2-diag-DX-FL
2 restant!

Miroir diagonal en étoile APM de 2 pouces avec revêtement diélectrique à 99% avec verrouillage rapide Le miroir diagonal est produit par APM-Teles...

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$181.00 - $181.00
$181.00
$181.00 - $181.00
$181.00
Askar 2” High-Precision Dielectric Diagonal
$175.00 - $175.00
$175.00
$175.00 - $175.00
$175.00

Askar 2” High-Precision Dielectric Diagonal

ASK-ASKAR2DIAG

2-inch Barrel Diameter High-Reflectivity Dielectric Mirror Coating Accepts both 2" and 1.25" Eyepieces Compatible with SCT and Refractor/Reflector...

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$175.00 - $175.00
$175.00
$175.00 - $175.00
$175.00
$289.00 - $289.00
$289.00
$289.00 - $289.00
$289.00

Baader Correcteur GlassPath 1.7x 2" pour Newtonien avec Correcteur de Coma

BAA-2456301

2" Glasspathcorrector ® Facteur 1,7 pour Newtons - à pleine ouverture avec Coma-Corrector intégré. Comprend un anneau de changement T-2 (#245632...

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$289.00 - $289.00
$289.00
$289.00 - $289.00
$289.00
$230.00 - $230.00
$230.00
$230.00 - $230.00
$230.00

Baader Correcteur Glasspath 1.8x 2" Réfracteur/SCT

BAA-2456305

2" Glasspathcorrector ® Facteur 1,8 pour Refractors et Schmidt Cassegrains - à pleine ouverture. Convient pour insérer dans les jumelles Baader ...

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$230.00 - $230.00
$230.00
$230.00 - $230.00
$230.00
$81.00 - $81.00
$81.00
$81.00 - $81.00
$81.00

Baader 2.25x Q-Barlow - 1.25"

BAA-2956185

Baader Planétarium Q-Barlow 2.25x / 1.3x Cette Barlow 2,25x de haute qualité en verres exotiques offre le rare facteur d'extension de 2,25x. Ainsi...

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$81.00 - $81.00
$81.00
$81.00 - $81.00
$81.00
$266.00 - $266.00
$266.00
$266.00 - $266.00
$266.00

Baader Barlow Modulaire 2x VIP - 1.25"

BAA-2406101

Le Baader Planetarium VIP Modular Barlow est un système complet de barlow photo-visuel 2X de haute qualité. La barlow VIP (visuel et photographique...

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$266.00 - $266.00
$266.00
$266.00 - $266.00
$266.00
$104.00 - $104.00
$104.00
$104.00 - $104.00
$104.00

Baader Renvoi Coudé avec Prisme Amici 45° avec OuVerture 24mm - 1.25"

BAA-2956150

Prisme beaucoup plus grand que les autres "prismes redresseurs" De nombreux prismes d'image Erect n'ont qu'une ouverture de passage libre de 19 ...

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$104.00 - $104.00
$104.00
$104.00 - $104.00
$104.00
$268.00 - $268.00
$268.00
$268.00 - $268.00
$268.00

Baader Renvoi Coudé avec Prisme Amici 45° - Filetage SCT 2"

BAA-2956151

Filetage SC 2" et réducteur 2"/1¼" Attachement direct à Schmidt-Cassegrains Orientation correcte de l'image Excellent pour la visualisation t...

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$268.00 - $268.00
$268.00
$268.00 - $268.00
$268.00
$806.00 - $806.00
$806.00
$806.00 - $806.00
$806.00

Baader Renvoi Coudé avec Prisme Amici 90° Grade-Astro avec Revêtement BBHS - ClickLock 2"

BAA-2456120
1 en stock

Pince ClickLock 2" et nez 2" Orientation correcte de l'image Convient pour l'observation astronomique à fort grossissement Enduit d'argent du...

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$806.00 - $806.00
$806.00
$806.00 - $806.00
$806.00
$358.00 - $358.00
$358.00
$358.00 - $358.00
$358.00

Baader Renvoi Coudé avec Prisme Amici 90° Grade-Astro avec Revêtement BBHS - T-2

BAA-2456130
1 en stock

Prisme en toit T-2/90° Baader. Fabriqué selon la norme Zeiss, les deux côtés avec filetage système T-2. Ce prisme est multicouche et construit d...

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$358.00 - $358.00
$358.00
$358.00 - $358.00
$358.00
$335.00 - $335.00
$335.00
$335.00 - $335.00
$335.00

Baader Renvoi Coudé avec Prisme Érecteur 90° - 2"

BAA-2956152

Prisme redresseur amici 90° avec oculaire 2" et canon 2" Y compris Réduction 2" à 1¼" Excellent pour la visualisation terrestre avec des oculai...

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$335.00 - $335.00
$335.00
$335.00 - $335.00
$335.00
$181.00 - $181.00
$181.00
$181.00 - $181.00
$181.00

Baader Renvoi Coudé avec Prisme 32mm Zenith 90° - T-2

BAA-2456005
1 en stock

Prisme Zenith T-2/90° de haute qualité avec prisme de 32 mm Corps en métal rigide Connexion côté objectif : filetage intérieur T-2 Oculaire de...

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$181.00 - $181.00
$181.00
$181.00 - $181.00
$181.00
$217.00 - $217.00
$217.00
$217.00 - $217.00
$217.00

Baader Renvoi Coudé avec Prisme 32mm Zenith 90° - 1.25"

BAA-2456005K
1 en stock

Comprend : T-2/32 Diagonal avec pince d'oculaire de mise au point de 1¼" (#2458125) et nez de 1¼" (#2458105) Prisme Zenith T-2/90° de haute qual...

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$217.00 - $217.00
$217.00
$217.00 - $217.00
$217.00
$14.00 - $14.00
$14.00
$14.00 - $14.00
$14.00

Baader Anneau Auxiliaire pour l'Adaptation de MaxBright II

BAA-2458272

Blocage de rotation/bague auxiliaire Maxbright II Bino - pour l'adaptation la plus courte possible du Maxbright® II Bino directement sur toutes ...

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$14.00 - $14.00
$14.00
$14.00 - $14.00
$14.00
$559.00 - $559.00
$559.00
$559.00 - $559.00
$559.00

Baader BBHS Prism Adjustable Star Diagonal - 2"

BAA-2456118
1 en stock

Broad Band Hard Silver (BBHS®) Coated Prism 2-inch ClickLock® Self-Centering Eyepiece Clamp Fully User-Collimatable Prism Mount CNC-Machined Alumi...

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$559.00 - $559.00
$559.00
$559.00 - $559.00
$559.00
$545.00 - $545.00
$545.00
$545.00 - $545.00
$545.00

Baader Barlow Abbe Carl Zeiss 2x - 1.25" avec ClickLock

BAA-1603321

De nouveau disponible pour une durée limitée : objectif Carl Zeiss 1¼" Abbe Barlow avec filetage T-2 fabriqué en Allemagne par Carl Zeiss à Ién...

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$545.00 - $545.00
$545.00
$545.00 - $545.00
$545.00
$349.00 - $349.00
$349.00
$349.00 - $349.00
$349.00

Baader Renvoi Coudé FlipMirror II

BAA-2458055

Baader-FlipMirror II Star Diagonal (BFM II) avec trois ports : Droit (S52, M48 et T-2 des deux côtés) pour appareil photo plein format, spectro...

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$349.00 - $349.00
$349.00
$349.00 - $349.00
$349.00
$873.00 - $873.00
$873.00
$873.00 - $873.00
$873.00

Baader Convertisseur Fluorite Flatfield

BAA-2458200

Système de lentilles en fluorite apochromatique multicouches Résolution de ligne 10 fois supérieure à celle des meilleurs oculaires de projectio...

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$873.00 - $873.00
$873.00
$873.00 - $873.00
$873.00
$144.00 - $155.00
$144.00 - $155.00
$144.00 - $155.00
$144.00

Baader Correcteur GlassPath pour Tête BinOculaire Maxbright et Mark V

Options available
1 variants in stock

Glasspathcorrector Factor 1.25. Longueur du chemin optique : -30 mm Glasspathcorrector Facteur 1,7. Longueur du chemin optique : -65 mm Glassp...

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$144.00 - $155.00
$144.00 - $155.00
$144.00 - $155.00
$144.00
$194.00 - $194.00
$194.00
$194.00 - $194.00
$194.00

Baader Barlow Hyperion Zoom 2.25X

BAA-2956180
1 en stock

Le Baader Hyperion Zoom Barlow se fixe rapidement à n'importe quel oculaire zoom Hyperion 8-24 mm Clickstop, le convertissant instantanément en un...

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$194.00 - $194.00
$194.00
$194.00 - $194.00
$194.00
$157.00 - $157.00
$157.00
$157.00 - $157.00
$157.00

Baader Prisme Amici Maxbright 1.25" avec Correcteur GlassPath Intégré 2X

BAA-2956155

45° un prisme dressé Amici Y compris 2x Glaswegkorrektor ™ (Glass Path Corrector) et un canon de 1¼ " Convient à tous les télescopes et réfrac...

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$157.00 - $157.00
$157.00
$157.00 - $157.00
$157.00
$731.00 - $903.00
$731.00 - $903.00
$731.00 - $903.00
$731.00

Baader Ensemble Tête BinOculaire MaxBright II

Options available

Baader MaxBright® II Binoviewer avec adaptateurs pour micro-baïonnette T-2 et Zeiss dans une mallette de transport rembourrée Prismes de 27 mm a...

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$731.00 - $903.00
$731.00 - $903.00
$731.00 - $903.00
$731.00
$279.00 - $279.00
$279.00
$279.00 - $279.00
$279.00

Baader Renvoi Coudé Maxbright - T-2

BAA-2456100
1 en stock

Diagonale étoile universelle Maxbright 1¼ " Matériau miroir Sitall (vitrocéramique à coefficient de dilatation nul), finition de surface 1/10 l...

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$279.00 - $279.00
$279.00
$279.00 - $279.00
$279.00
$72.00 - $72.00
$72.00
$72.00 - $72.00
$72.00

Baader Adaptateur de Digiscopie Microstage II

BAA-2450330
1 en stock

Les appareils photo numériques d'aujourd'hui permettent désormais aux amateurs de prendre des images spectaculaires d'objets du système solaire ave...

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$72.00 - $72.00
$72.00
$72.00 - $72.00
$72.00

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.