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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.

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CA$62.00 - CA$62.00
CA$62.00
CA$62.00 - CA$62.00
CA$62.00

Celestron Renvoi Coudé - 1.25"

CEL-94115-A

Caractéristiques Convient aux télescopes avec porte-oculaires ou dos visuels de 1,25", angle de vision de 90°, idéal pour observer les objets au...

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CA$62.00 - CA$62.00
CA$62.00
CA$62.00 - CA$62.00
CA$62.00
CA$361.00 - CA$361.00
CA$361.00
CA$361.00 - CA$361.00
CA$361.00

Celestron Microscope Binoculaire Stéréo

CEL-93691

Caractéristiques Les visionneuses binoculaires améliorent considérablement les vues, produisant un effet tridimensionnel que vous allez adorer ! ...

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CA$361.00 - CA$361.00
CA$361.00
CA$361.00 - CA$361.00
CA$361.00
CA$174.00 - CA$174.00
CA$174.00
CA$174.00 - CA$174.00
CA$174.00

Celestron Barlow X-Cel LX 2x - 1.25"

CEL-93529

Caractéristiques La qualité X-Cel LX 2x Barlow double le grossissement de tout oculaire de 1,25" Les optiques apochromatiques à 3 éléments entiè...

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CA$174.00 - CA$174.00
CA$174.00
CA$174.00 - CA$174.00
CA$174.00
CA$174.00 - CA$174.00
CA$174.00
CA$174.00 - CA$174.00
CA$174.00

Celestron Barlow X-Cel LX 3x - 1.25"

CEL-93428

Caractéristiques La qualité X-Cel LX 3x Barlow triple le grossissement de n'importe quel oculaire de 1,25", parfait pour les propriétaires de t...

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CA$174.00 - CA$174.00
CA$174.00
CA$174.00 - CA$174.00
CA$174.00
CA$59.00 - CA$59.00
CA$59.00
CA$59.00 - CA$59.00
CA$59.00

David Astro 90° Diagonal - 1.25"

DAV-DIAG-1.25
2 restant!

The 1.25" Mirror Diagonal is a must-have accessory for astronomers, providing a comfortable viewing angle and improved image quality during telesc...

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CA$59.00 - CA$59.00
CA$59.00
CA$59.00 - CA$59.00
CA$59.00
CA$149.00 - CA$149.00
CA$149.00
CA$149.00 - CA$149.00
CA$149.00

David Astro 99% Dielectric Twist-Lock Diagonal - 1.25"

DAV-DIG-TL-1.25
6 en stock

The 1.25" 99% Dielectric Twist-Lock Diagonal is an essential upgrade for astronomers seeking the best in optical performance and convenience. This...

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CA$149.00 - CA$149.00
CA$149.00
CA$149.00 - CA$149.00
CA$149.00
CA$219.00 - CA$219.00
CA$219.00
CA$219.00 - CA$219.00
CA$219.00

David Astro 99% Dielectric Twist-Lock Diagonal - 2"

DAV-DIG-TL-2
5 restant!

The 2" 99% Dielectric Twist-Lock Diagonal is an essential upgrade for astronomers seeking the best in optical performance and convenience. This pre...

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CA$219.00 - CA$219.00
CA$219.00
CA$219.00 - CA$219.00
CA$219.00
CA$199.00 - CA$199.00
CA$199.00
CA$199.00 - CA$199.00
CA$199.00

David Astro Penta Prism Diagonal - 1.25"

DAV-PENTA-1.25
4 restant!

The David Astro Penta Prism 90-Degree Diagonal is a non inverting non reversing diagonal. It’s particularly suited for use with the David Astro Pre...

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CA$199.00 - CA$199.00
CA$199.00
CA$199.00 - CA$199.00
CA$199.00
Épuisé
CA$549.00 - CA$549.00
CA$549.00
CA$549.00 - CA$549.00
CA$549.00

David Astro Premium Linear Erect Binoviewer

DAV-BINO

No backfocus requirement, it can be used with any telescopes, newtonians included, without the need for barlow or extender lenses. Self-Centering ...

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CA$549.00 - CA$549.00
CA$549.00
CA$549.00 - CA$549.00
CA$549.00
Épuisé
Daystar 2" Dielectric Mirror Diagonal
CA$223.00 - CA$223.00
CA$223.00
CA$223.00 - CA$223.00
CA$223.00

Daystar 2" Dielectric Mirror Diagonal

DAY-DS2MD

2.0" Barrel Size Dielectric Mirror Coating For Telescopes with 2" Focusers 90-Degree Viewing Angle Description FAQ Specifications In the Box Wa...

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CA$223.00 - CA$223.00
CA$223.00
CA$223.00 - CA$223.00
CA$223.00
CA$167.99 - CA$167.99
CA$167.99
CA$167.99 - CA$167.99
CA$167.99

Explore Scientific Barlow Télécentrique 2x - 1.25"

ES-FE02-125

Un bon prolongateur de focale ajoute une réelle polyvalence à la gamme d'accessoires de votre télescope. Tout d'abord, il vous permet d'augmenter l...

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CA$167.99 - CA$167.99
CA$167.99
CA$167.99 - CA$167.99
CA$167.99
CA$251.99 - CA$251.99
CA$251.99
CA$251.99 - CA$251.99
CA$251.99

Explore Scientific Barlow Télécentrique 2X - 2"

ES-FE02-020

Le prolongateur de focale Explore Scientific 2X (OD de 2,0 pouces) accepte les oculaires et les adaptateurs de caméra au format OD de 1,25 pouces e...

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CA$251.99 - CA$251.99
CA$251.99
CA$251.99 - CA$251.99
CA$251.99
CA$195.99 - CA$195.99
CA$195.99
CA$195.99 - CA$195.99
CA$195.99

Explore Scientific Barlow Télécentrique 3X - 1.25"

ES-FE03-125
1 en stock

Un bon prolongateur de focale ajoute une réelle polyvalence à la gamme d'accessoires de votre télescope. Tout d'abord, il vous permet d'augmenter l...

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CA$195.99 - CA$195.99
CA$195.99
CA$195.99 - CA$195.99
CA$195.99
CA$251.99 - CA$251.99
CA$251.99
CA$251.99 - CA$251.99
CA$251.99

Explore Scientific Barlow Télécentrique 3X - 2"

ES-FE03-020

Le prolongateur de focale Explore Scientific 3X (OD de 2,0 pouces) accepte les oculaires et les adaptateurs de caméra au format OD de 1,25 pouces e...

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CA$251.99 - CA$251.99
CA$251.99
CA$251.99 - CA$251.99
CA$251.99
CA$181.99 - CA$181.99
CA$181.99
CA$181.99 - CA$181.99
CA$181.99

Explore Scientific Barlow Télécentrique 5X - 1.25"

ES-FE05-125
2 en stock

Un bon prolongateur de focale ajoute une réelle polyvalence à la gamme d'accessoires de votre télescope. Tout d'abord, il vous permet d'augmenter l...

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CA$181.99 - CA$181.99
CA$181.99
CA$181.99 - CA$181.99
CA$181.99
CA$307.99 - CA$307.99
CA$307.99
CA$307.99 - CA$307.99
CA$307.99

Explore Scientific Renvoi Coudé 99% Diélectrique -2"

ES-DD02-00CF

Le miroir diagonal à revêtement diélectrique Explore Scientific de 2 pouces est livré avec un adaptateur de 1,25 pouce et des caches anti-poussièr...

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CA$307.99 - CA$307.99
CA$307.99
CA$307.99 - CA$307.99
CA$307.99
CA$825.99 - CA$825.99
CA$825.99
CA$825.99 - CA$825.99
CA$825.99

Explore Scientific Renvoi Coudé 99% Diélectrique -3"

ES-DD03-01CF

Le miroir diagonal à revêtement diélectrique Explore Scientific de 3 pouces est livré avec un adaptateur de 2 pouces et des caches anti-poussière. ...

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CA$825.99 - CA$825.99
CA$825.99
CA$825.99 - CA$825.99
CA$825.99
Explore Scientific BinoViewer for Telescopes
CA$700.00 - CA$700.00
CA$700.00
CA$700.00 - CA$700.00
CA$700.00

Explore Scientific BinoViewer for Telescopes

ES-BINOV

Engage both eyes for more comfortable, immersive viewing Integrated erecting prism provides correctly oriented images Accepts two matched 1.25" ey...

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CA$700.00 - CA$700.00
CA$700.00
CA$700.00 - CA$700.00
CA$700.00
iOptron Dielectric Star Diagonal (1.25")
CA$111.00 - CA$111.00
CA$111.00
CA$111.00 - CA$111.00
CA$111.00

iOptron Dielectric Star Diagonal (1.25")

IOP-6231

1.25" Barrel Diameter Dielectric Mirror Coatings Improves Image Brightness and Contrast Durable, Long-Lasting Reflective Surface Ideal for Refract...

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CA$111.00 - CA$111.00
CA$111.00
CA$111.00 - CA$111.00
CA$111.00
iOptron Dielectric Star Diagonal (2'')
CA$207.00 - CA$207.00
CA$207.00
CA$207.00 - CA$207.00
CA$207.00

iOptron Dielectric Star Diagonal (2'')

IOP-6232

2-inch Barrel for Wide-Field Eyepieces Multi-Layer Dielectric Mirror Coatings High-Reflectivity for Brighter Images Enhanced Coating Durability an...

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CA$207.00 - CA$207.00
CA$207.00
CA$207.00 - CA$207.00
CA$207.00
iOptron Universal Smartphone Eyepiece Adapter - Red
CA$69.00 - CA$69.00
CA$69.00
CA$69.00 - CA$69.00
CA$69.00

iOptron Universal Smartphone Eyepiece Adapter - Red

IOP-8432

Universal smartphone clamp for afocal astrophotography Attaches your phone camera to a telescope eyepiece Lightweight design minimizes focuser str...

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CA$69.00 - CA$69.00
CA$69.00
CA$69.00 - CA$69.00
CA$69.00
SVBONY 2X Barlow 1.25inch with M42 Threads
CA$21.00 - CA$21.00
CA$21.00
CA$21.00 - CA$21.00
CA$21.00

SVBONY 2X Barlow Lens with M42 Threads - 1.25"

SV-F9108A
7 en stock

2X Magnification Factor Standard 1.25" Diameter Barrel Integrated M42x0.75 T-Threads for Cameras Multilayer HD Broadband Green Film Coatings Full ...

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CA$21.00 - CA$21.00
CA$21.00
CA$21.00 - CA$21.00
CA$21.00
Svbony Barlow Lens 1.25 inch 5X
CA$21.00 - CA$21.00
CA$21.00
CA$21.00 - CA$21.00
CA$21.00

SVBONY 5X Barlow Lens - 1.25"

SV-F9102A

5X Magnification Power 1.25" (31.7mm) Barrel Size Multi-Coated Optical Glass Durable Metal Housing Weight: 3.0oz (85g) Description FAQ Specific...

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CA$21.00 - CA$21.00
CA$21.00
CA$21.00 - CA$21.00
CA$21.00
Svbony Metal Telescope Cellphone Holder Bracket
CA$15.00 - CA$15.00
CA$15.00
CA$15.00 - CA$15.00
CA$15.00

SVBONY Metal Telescope Cellphone Holder Bracket for 24-38mm Eyepieces

SV-F9112A

Eyepiece Compatibility: 24-38mm Diameter Smartphone Width: 60-95mm 360° Camera Rotation Durable Metal Construction Foam-Padded Phone Protection ...

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CA$15.00 - CA$15.00
CA$15.00
CA$15.00 - CA$15.00
CA$15.00

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.