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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.

Filtres

CA$362.00 - CA$696.00
CA$362.00 - CA$696.00
CA$362.00 - CA$696.00
CA$362.00

Antlia Filtre à bande étroite H-alpha Pro de 3nm

Options available
8 variants in stock

Longueur d'onde centrale H-alpha de 656,3 nm Petit FHWM de 3 nm Transmission de crête élevée > 88 % Halos minimisés sur les étoiles b...

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CA$362.00 - CA$696.00
CA$362.00 - CA$696.00
CA$362.00 - CA$696.00
CA$362.00
CA$375.00 - CA$721.00
CA$375.00 - CA$721.00
CA$375.00 - CA$721.00
CA$375.00

Antlia 3nm Narrowband H-alpha Pro Highspeed Filter - f/2.6 to f/3.6

Options available
1 variants in stock

Pre-shifted 656.3nm H-alpha Central Wavelength for High-Speed Systems Optimized 3nm FHWM for f/2.6–f/3.6 High >90% Peak Transmission Enhanced S...

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CA$375.00 - CA$721.00
CA$375.00 - CA$721.00
CA$375.00 - CA$721.00
CA$375.00
CA$362.00 - CA$696.00
CA$362.00 - CA$696.00
CA$362.00 - CA$696.00
CA$362.00

Antlia Filtre à bande étroite OIII Pro de 3nm

Options available
8 variants in stock

Le filtre à bande étroite Antlia OIII Pro optimise le FWHM (pleine largeur moitié maximum) à 3 nm passe-bande . Au fur et à mesure que la bande pa...

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CA$362.00 - CA$696.00
CA$362.00 - CA$696.00
CA$362.00 - CA$696.00
CA$362.00
CA$375.00 - CA$721.00
CA$375.00 - CA$721.00
CA$375.00 - CA$721.00
CA$375.00

Antlia 3nm Narrowband OIII Pro Highspeed Filter - f/2.6 to f/3.6

Options available
1 variants in stock

Pre-shifted 500.7nm OIII Central Wavelength for High-Speed Systems Optimized 3nm FHWM for f/2.6–f/3.6 High >90% Peak Transmission Enhan...

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CA$375.00 - CA$721.00
CA$375.00 - CA$721.00
CA$375.00 - CA$721.00
CA$375.00
CA$362.00 - CA$696.00
CA$362.00 - CA$696.00
CA$362.00 - CA$696.00
CA$362.00

Antlia Filtre à bande étroite SII Pro de 3nm

Options available
7 variants in stock

Le filtre à bande étroite Antlia SII Pro optimise le FWHM (pleine largeur moitié maximum) à une bande passante de 3 nm. Au fur et à mesure que la ...

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CA$362.00 - CA$696.00
CA$362.00 - CA$696.00
CA$362.00 - CA$696.00
CA$362.00
CA$375.00 - CA$721.00
CA$375.00 - CA$721.00
CA$375.00 - CA$721.00
CA$375.00

Antlia 3nm Narrowband SII Pro Highspeed Filter - f/2.6 to f/3.6

Options available
1 variants in stock

Pre-shifted 500.7nm OIII Central Wavelength for High-Speed Systems Optimized 3nm FHWM for f/2.6–f/3.6 High >90% Peak Transmission Enhan...

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CA$375.00 - CA$721.00
CA$375.00 - CA$721.00
CA$375.00 - CA$721.00
CA$375.00
CA$263.00 - CA$497.00
CA$263.00 - CA$497.00
CA$263.00 - CA$497.00
CA$263.00

Antlia Filtre à bande étroite H-alpha Edge de 4.5nm

Options available
8 variants in stock

Le filtre à bande étroite Antlia H-alpha EDGE optimise le FWHM (pleine largeur demi-maximum) à une bande passante de 4,5 nm. La suppression de la...

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CA$263.00 - CA$497.00
CA$263.00 - CA$497.00
CA$263.00 - CA$497.00
CA$263.00
CA$263.00 - CA$497.00
CA$263.00 - CA$497.00
CA$263.00 - CA$497.00
CA$263.00

Antlia Filtre à bande étroite OIII Edge de 4.5nm

Options available
8 variants in stock

Le filtre à bande étroite Antlia OIII EDGE optimise le FWHM (pleine largeur demi-maximum) à une bande passante de 4,5 nm. La suppression de la de...

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CA$263.00 - CA$497.00
CA$263.00 - CA$497.00
CA$263.00 - CA$497.00
CA$263.00
CA$263.00 - CA$497.00
CA$263.00 - CA$497.00
CA$263.00 - CA$497.00
CA$263.00

Antlia Filtre à bande étroite SII Edge de 4.5nm

Options available
7 variants in stock

Le filtre à bande étroite Antlia SII EDGE optimise le FWHM (pleine largeur demi-maximum) à une bande passante de 4,5 nm. La suppression de la den...

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CA$263.00 - CA$497.00
CA$263.00 - CA$497.00
CA$263.00 - CA$497.00
CA$263.00
CA$554.00 - CA$554.00
CA$554.00
CA$554.00 - CA$554.00
CA$554.00

Antlia ALP-T Dual Band Ha&OIII 3nm

ANT-ALP-T-3NM-HAOIII
5 en stock

Precise Narrowband Filtering for Exceptional Contrast Enhanced Transmission for Superior Signal-to-Noise Ratio ...

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CA$554.00 - CA$554.00
CA$554.00
CA$554.00 - CA$554.00
CA$554.00
CA$1,008.00 - CA$1,008.00
CA$1,008.00
CA$1,008.00 - CA$1,008.00
CA$1,008.00

Antlia ALP-T Dual Band Ha&OIII 3nm + SII&Hb 3.5nm 2" Filter Set

ANT-ALP-T-3NM-KIT

Precise Narrowband Filtering for Exceptional Contrast Enhanced Transmission for Superior Signal-to-Noise Ratio ...

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CA$1,008.00 - CA$1,008.00
CA$1,008.00
CA$1,008.00 - CA$1,008.00
CA$1,008.00
CA$511.00 - CA$511.00
CA$511.00
CA$511.00 - CA$511.00
CA$511.00

Antlia ALP-T Dual Band SII&Hβ 3.5nm

ANT-ALP-T-3NM-SIIHB
2 en stock

Precise Narrowband Filtering for Exceptional Contrast Enhanced Transmission for Superior Signal-to-Noise Ratio Anti-Reflection Coating to Reduce H...

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CA$511.00 - CA$511.00
CA$511.00
CA$511.00 - CA$511.00
CA$511.00
CA$980.00 - CA$980.00
CA$980.00
CA$980.00 - CA$980.00
CA$980.00

Antlia Kit de filtres duoband ALP-T 5nm Ha/OIII et SII/Hb - 2"

ANT-ALP-T-SET

CA$980.00 - CA$980.00
CA$980.00
CA$980.00 - CA$980.00
CA$980.00
CA$540.00 - CA$540.00
CA$540.00
CA$540.00 - CA$540.00
CA$540.00

Antlia Filtre duoband ALP-T Ha/OIII de 5nm

ANT-ALP-T-2

L' Antlia ALP-T double bande 5 nm Le filtre Ha&OIII est un filtre passe-ligne double conçu pour être utilisé principalement avec les appareil...

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CA$540.00 - CA$540.00
CA$540.00
CA$540.00 - CA$540.00
CA$540.00
CA$540.00 - CA$540.00
CA$540.00
CA$540.00 - CA$540.00
CA$540.00

Antlia Filtre duoband ALP-T haute vitesse Ha/OIII de 5nm

ANT-ALP-T-HS-2

Les filtres haute vitesse ALP-T double bande 5 nm sont encore optimisés pour fonctionner avec des systèmes d'imagerie à haute vitesse en décalant...

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CA$540.00 - CA$540.00
CA$540.00
CA$540.00 - CA$540.00
CA$540.00
CA$497.00 - CA$497.00
CA$497.00
CA$497.00 - CA$497.00
CA$497.00

Antlia Filtre duoband ALP-T SII/Hb de 5nm

ANT-ALP-T-SII-HB-2

Le filtre SII&Hb double bande 5 nm ALP-T est un filtre passe-ligne double, qui laisse passer la ligne rouge foncé Sulphur-II et la ligne bleu...

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CA$497.00 - CA$497.00
CA$497.00
CA$497.00 - CA$497.00
CA$497.00
CA$236.00 - CA$236.00
CA$236.00
CA$236.00 - CA$236.00
CA$236.00

Antlia CH4 Methane Filter - 1.25"

ANT-CH4
1 en stock

Antlia methane (CH4) filter is a specialized filter that allows light in the near infrared portion of the spectrum centered at 889nm to pass throug...

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CA$236.00 - CA$236.00
CA$236.00
CA$236.00 - CA$236.00
CA$236.00
CA$141.00 - CA$141.00
CA$141.00
CA$141.00 - CA$141.00
CA$141.00

Antlia Filtre visuel H-beta et OIII - 1.25"

ANT-HB-OIII-1.25
3 en stock

Le filtre Antlia HB-OIII est conçu spécifiquement pour l'observation visuelle nocturne des nébuleuses à contraste élevé et l'astrophotographie du...

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CA$141.00 - CA$141.00
CA$141.00
CA$141.00 - CA$141.00
CA$141.00
CA$55.00 - CA$55.00
CA$55.00
CA$55.00 - CA$55.00
CA$55.00

Antlia Filtre IR-Pass 685nm - 1.25"

ANT-IR685
3 en stock

Le filtre Antlia IR Pass 685 nm est un filtre absorbant qui laisse passer la lumière infrarouge avec des longueurs d'onde supérieures à 685 nm. À...

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CA$55.00 - CA$55.00
CA$55.00
CA$55.00 - CA$55.00
CA$55.00
CA$55.00 - CA$55.00
CA$55.00
CA$55.00 - CA$55.00
CA$55.00

Antlia Filtre IR-Pass 850nm - 1.25"

ANT-IR850
3 en stock

Le filtre Antlia IR Pass 850 nm est un filtre absorbant qui laisse passer la lumière infrarouge avec des longueurs d'onde supérieures à 850 nm. I...

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CA$55.00 - CA$55.00
CA$55.00
CA$55.00 - CA$55.00
CA$55.00
CA$426.00 - CA$852.00
CA$426.00 - CA$852.00
CA$426.00 - CA$852.00
CA$426.00

Antlia Kit de filtres LRGB-V Pro

Options available
8 variants in stock

Les filtres de la série Antlia LRGB-V Pro sont conçus pour les caméras monochromes qui utilisent à la fois des capteurs CCD et CMOS. Les capteurs ...

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CA$426.00 - CA$852.00
CA$426.00 - CA$852.00
CA$426.00 - CA$852.00
CA$426.00
CA$281.00 - CA$281.00
CA$281.00
CA$281.00 - CA$281.00
CA$281.00

Antlia Filtre Quad Band anti-pollution lumineuse - 2"

ANT-QUAD-2
5 en stock

Le filtre anti-pollution lumineuse Antlia Quad Band est un filtre de suppression de lumière pour les caméras couleur et monochromes. Il est capabl...

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CA$281.00 - CA$281.00
CA$281.00
CA$281.00 - CA$281.00
CA$281.00
CA$254.00 - CA$254.00
CA$254.00
CA$254.00 - CA$254.00
CA$254.00

Antlia Filtre Triband RGB Ultra

ANT-TRIBAND-V2
4 en stock

Il est conçu pour la suppression de la pollution lumineuse pour les caméras OSC et Mono. La conception spectrale a sélectionné les informations le...

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CA$254.00 - CA$254.00
CA$254.00
CA$254.00 - CA$254.00
CA$254.00
CA$283.00 - CA$283.00
CA$283.00
CA$283.00 - CA$283.00
CA$283.00

Antlia Filtre U-Venus - 1.25"

ANT-UVENUS
2 en stock

Le filtre Antlia Venus-U est conçu pour imager la structure nuageuse de Vénus et Jupiter avec des caméras CCD sur un télescope. Les détails des n...

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CA$283.00 - CA$283.00
CA$283.00
CA$283.00 - CA$283.00
CA$283.00

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.