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Oculaires

Eyepieces are the only part of a telescope you actually look through, and they are where a modest instrument can be made to feel expensive or an expensive one made to feel disappointing. David Astro stocks eyepieces in Canada across 1.25", 2" and 3" barrels, from wide-field 82 and 100 degree designs to compact planetary orthoscopics, shipped domestically.

We help customers build sets rather than accumulate overlapping focal lengths. Tell us your telescope's aperture and focal length and typical seeing at your site, and we will suggest three or four eyepieces that cover the useful magnification range without redundancy.

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APM Illuminateur pour Oculaires Réticulé

Illuminateur pour oculaires à réticule Modèle éclairé pour les oculaires à réticule

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Baader Oculaire Classic Ortho 10mm - 1.25"

Focale de 10mm Champ apparent de 52° Conception orthoscopique classique à 4 éléments Optique à multitraitement HT Sans danger pour la projection s...

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Baader Oculaire Classic Ortho 18mm - 1.25"

Focale de 18mm Champ apparent de 52° Conception orthoscopique classique à 4 éléments Coulant de 1.25" Conçu pour une projection solaire sûre Optiq...

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Baader Oculaire Classic Ortho 6mm - 1.25"

Conception optique orthoscopique classique Focale de 6mm pour un fort grossissement Optimisé pour l'observation planétaire à fort contraste Sans d...

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$108.00 USD - $108.00 USD
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Baader Oculaire Classic Plossl 32mm - 1.25"

Focale de 32mm Coulant de 1.25" Optique à multitraitement HT Optimisé pour un champ réel maximal Colle résistante à la chaleur pour la projection ...

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$217.00 USD - $217.00 USD
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Baader Oculaire Hyperion 68° 10mm - 1.25"/2"

Focale de 10mm Champ apparent de 68° Conception modulaire à double coulant 1.25" et 2" 8 lentilles en 5 groupes Traitements multicouches Baader Ph...

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Baader Oculaire Hyperion 68° 13mm - 1.25"/2"

Focale de 13mm Champ apparent de 68° Conception à double coulant 1.25" et 2" 8 lentilles en 5 groupes Dégagement oculaire de 20mm Filetages caméra...

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Baader Oculaire Hyperion 68° 17mm - 1.25"/2"

Focale de 17mm Champ apparent de 68° Dégagement oculaire de 20mm Conception à double coulant 1.25" et 2" Traitements multicouches Baader Phantom C...

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Baader Oculaire Hyperion 68° 21mm - 1.25"/2"

Focale de 21mm Champ apparent de 68° Conception à double coulant 1.25" et 2" Dégagement oculaire de 20mm Filetages photo M43 et SP54 Traitements m...

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Baader Oculaire Hyperion 68° 24mm - 1.25"/2"

Focale de 24mm Champ apparent de 68° Conception à double coulant 1.25" et 2" Traitements multicouches Baader Phantom Group Dégagement oculaire de ...

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Baader Oculaire modulaire Hyperion 68° 5mm - 1.25" & 2"

Focale de 5mm pour l'observation à fort grossissement Champ apparent de 68° Double coulant 1.25" et 2" Conception modulaire permettant des focales...

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Baader Oculaire Hyperion 68° 8mm - 1.25"/2"

Focale de 8mm Champ apparent de 68° Conception à double coulant 1.25" et 2" Long dégagement oculaire de 20mm Conception modulaire avec filetages c...

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Baader Jeu d'oculaires Hyperion 68°

Jeu complet de sept focales : 5, 8, 10, 13, 17, 21 et 24 mm Champ apparent constant de 68° sur tous les oculaires Conception optique à 8 lentilles...

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$290.00 USD - $290.00 USD
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Baader Oculaire Hyperion Aspheric 72° 31mm - 1.25"/2"

Focale de 31mm Champ apparent de 72° (en mode 2") Conception optique asphérique à 6 lentilles Conception à double coulant 1.25" et 2" Dégagement o...

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Baader Oculaire Hyperion Aspheric 72° 36mm - 1.25"/2"

Focale de 36mm Champ apparent de 72° (coulant 2") Conception optique asphérique à 6 éléments Double coulant 1.25" et 2" Traitements mult...

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$306.00 USD - $306.00 USD
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Baader Oculaire zoom Hyperion Universal Mark IV 8-24mm - 1.25"/2"

Focale zoom continue de 8mm à 24mm Cinq crans de positionnement fermes (8, 12, 16, 20, 24mm) Champ apparent de 68° à 8mm 290 g, 55mm de diamètre L...

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Baader Oculaire zoom Hyperion Universal Mark IV avec Barlow 2.25x 8-24mm/3.6-10.7mm

Couvre une plage de focale continue de 3.6mm à 24mm Comprend l'oculaire Hyperion Universal Zoom Mark IV (8-24mm) Comprend la lentille de Barlow Hy...

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Baader Oculaire Morpheus 76° 12.5mm - 1.25"/2"

Focale de 12.5mm Champ apparent de 76° Double coulant 1.25" et 2" Dégagement oculaire long de 20mm Filetages photo/vidéo M43 pour l'imagerie Conce...

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Baader Oculaire Morpheus 76° 14mm - 1.25"/2"

Focale de 14mm Champ apparent de 76° Double coulant 1.25" et 2" Dégagement oculaire de 18.5mm Conception optique à 8 éléments Filetage d'adaptatio...

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Baader Oculaire Morpheus 76° 17.5mm - 1.25"/2"

Focale de 17.5mm Champ apparent de 76° Long dégagement oculaire de 23mm Double coulant 1.25" et 2" Conception optique à 8 lentilles avec verre ED ...

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Baader Oculaire Morpheus 76° 4.5mm - 1.25"/2"

Focale de 4.5mm Champ apparent de 76° Double coulant 1.25" et 2" Dégagement oculaire de 17.5mm Corps de 55mm de diamètre pour le binoviseur Fileta...

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Baader Oculaire Morpheus 76° 6.5mm - 1.25"/2"

Focale de 6.5mm Champ apparent de 76° Double coulant 1.25" et 2" Dégagement oculaire de 18.5mm Corps de 55mm optimisé pour le binoviseur Filetage ...

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Baader Oculaire Morpheus 76° 9mm - 1.25"/2"

Focale de 9mm Champ apparent de 76° Double coulant 1.25" et 2" Long dégagement oculaire de 21mm Filetage M43 pour l'adaptation photo/vidéo Optimis...

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Baader Jeu d'oculaires Morpheus complet

Jeu complet de six oculaires grand champ : 4.5mm, 6.5mm, 9mm, 12.5mm, 14mm et 17.5mm Champ apparent de 76° avec un champ plat Conception optique à...

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$2,303.00 USD - $2,303.00 USD
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How to Choose Eyepiece Focal Lengths

Magnification is your telescope's focal length divided by the eyepiece's. Exit pupil — eyepiece focal length divided by focal ratio — determines how bright and comfortable the view is, and it is the number that actually sets the useful range.

  • Low power, 5 to 7 mm exit pupil: Widest true field for large nebulae, star fields and finding targets. Above 7 mm your eye's pupil clips the beam and you waste aperture.
  • Medium power, 2 to 3 mm exit pupil: The workhorse range for most deep-sky observing, balancing image scale against background darkness.
  • High power, 0.7 to 1 mm exit pupil: Planetary, lunar and double star work. Canadian seeing usually caps useful magnification well below the theoretical limit.
  • Apparent field of view: 50 degree designs are compact and inexpensive; 82 and 100 degree designs give an immersive view and much longer tracking time in an undriven Dobsonian.
  • Eye relief: Eyeglass wearers need roughly 15 mm or more. Short focal length simple designs often have very little, which makes them uncomfortable regardless of optical quality.
  • Barrel size: 2" barrels are needed for long focal length wide-field eyepieces; 1.25" covers everything from medium to high power.

Why Choose David Astro for Eyepieces

An eyepiece recommendation is only useful if it accounts for the telescope it will be used in and the sky it will be used under.

  • Set planning, not single sales: We space focal lengths so each step is a meaningful jump, typically by a factor of roughly 1.4 to 1.5, instead of selling you two eyepieces that give nearly the same view.
  • Focal ratio honesty: Below f/5, simple designs show edge aberrations that no coating fixes. We say so, and we also say when a premium eyepiece will not visibly improve a slow telescope.
  • Exit pupil calculated for you: We work out the useful range for your specific aperture and focal length rather than quoting general rules.
  • Authorized dealer: Genuine eyepieces with manufacturer warranty, in stock here and shipped without customs delays for Canadian buyers.
  • Domestic shipping: Ships from Canada with no duties or brokerage fees for Canadian orders.

Eyepieces in Canada — Frequently Asked Questions

How many eyepieces do I actually need?
Three or four covers almost everything: a low power for finding and wide fields, one or two medium powers for deep sky, and one high power for planets. A good Barlow can substitute for one of them.
Are 100 degree eyepieces worth the price?
In an undriven Dobsonian, very much so — objects stay in the field far longer and the view is immersive. On a tracking mount at medium power the advantage is real but smaller, and the weight can upset balance.
What is the highest magnification I can use?
Optically, roughly twice the aperture in millimetres. Practically, Canadian seeing limits most nights to 150 to 250x regardless of aperture, and pushing past that gives a larger, softer image rather than more detail.
Do I need 2 inch eyepieces?
Only for long focal length wide-field views. If your telescope's maximum true field is already limited by a 1.25 inch barrel and you want more, a 2 inch focuser and eyepiece is the way to get it.

Building an eyepiece set?

Tell us your telescope and observing site and we will map out a complete set. Authorized dealer, Canadian stock.