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Réfracteurs

Refractors earn their following through consistency. A sealed lens system holds collimation indefinitely, cools quickly, gives high-contrast views without a central obstruction, and — in modern apochromatic form — produces the clean, round stars that make wide-field astrophotography look effortless. David Astro carries refractors in Canada, from compact 50 mm travel astrographs to large apochromatic triplets, shipping from Canadian stock.

We image with refractors under Canadian skies and can speak to the practical differences between doublets and triplets, and between glass types, in terms of what actually shows in a finished image rather than what appears on a specification sheet.

Filtres

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Askar Lunette triplet 103APO f/6.8

Objectif APO triplet à lame d'air de 103mm d'ouverture Focale de 700.4mm Rapport focal natif de f/6.8 Comprend un élément en verre ED pour une exc...

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$1,199.00 USD - $1,199.00 USD
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Askar Astrographe APO quadruplet 107PHQ f/7

Conception optique APO quadruplet de 107mm d'ouverture Focale de 749mm à f/7 Cercle image corrigé de 44mm pour les capteurs plein format Aplanisse...

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$2,299.00 USD - $2,299.00 USD
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Askar Astrographe à champ plat 111F

Ouverture de 111mm Focale de 766mm (f/6.9) Conception APO quadruplet à lame d'air avec verre ED Cercle image corrigé de 44mm Aplanisseur de champ ...

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$1,699.00 USD - $1,699.00 USD
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Askar Lunette triplet 120APO f/7

Objectif APO triplet à lame d'air de 120mm d'ouverture Comprend un élément en verre ED pour une excellente correction chromatique Focale de 840mm ...

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$1,699.00 USD - $1,699.00 USD
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Askar Astrographe APO quadruplet 130PHQ f/7.7

Optique APO quadruplet de 130mm d'ouverture Focale de 1000mm à f/7.7 Aplanisseur de champ intégré Cercle image corrigé de 60mm Poids total assembl...

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$3,499.00 USD - $3,499.00 USD
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Askar 131F Flat-Field APO Refractor
$1,999.00 USD - $1,999.00 USD
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Askar Lunette APO à champ plat 131F

Ouverture de 131mm Focale de 983mm (f/7.5) Conception optique APO quadruplet à lame d'air Comprend un élément en verre ED Cercle image plein forma...

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Askar Lunette triplet 140APO f/7

Ouverture de 140mm Focale de 980mm (f/7) Objectif APO triplet à lame d'air avec verre ED Poids du tube optique : 9.2kg | Poids total : 10.9kg Tube...

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Askar 151PHQ f/7 Quadruplet Astrograph
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Askar Astrographe quadruplet 151PHQ f/7

Optique APO quadruplet de 151mm d'ouverture Focale de 1057mm à f/7 Aplanisseur intégré pour un cercle image de 60mm Comprend 2 éléments en verre E...

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$3,845.00 USD - $3,845.00 USD
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Askar Lunette triplet 160APO f/7

Objectif APO triplet à lame d'air de 160mm d'ouverture Focale de 1120mm à f/7 Comprend un élément en verre ED pour la correction chromatique Pare-...

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$3,845.00 USD - $3,845.00 USD
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$5,279.00 USD - $5,279.00 USD
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Askar Lunette triplet 185APO f/7

Objectif APO triplet de 185mm d'ouverture Focale de 1295mm à f/7 Comprend un élément en verre ED pour la correction chromatique Tube arrière rétra...

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$5,279.00 USD - $5,279.00 USD
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Askar 203APO f/7 Triplet APO Refractor
$8,579.00 USD - $8,579.00 USD
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Askar Lunette APO triplet 203APO f/7

Objectif APO triplet à lame d'air de 203mm d'ouverture Focale de 1421mm à f/7 Comprend un élément en verre ED (Extra-Low Dispersion, à très faible...

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$8,579.00 USD - $8,579.00 USD
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$299.00 USD - $299.00 USD
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Askar Astrographe APO quadruplet 50P f/3.8

Optique APO quadruplet de 50mm d'ouverture Rapport focal ultra-rapide f/3.8 Focale de 190mm Champ nativement plat pour les capteurs APS-C Backfocu...

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$299.00 USD - $299.00 USD
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Askar 60F Flat-Field Astrograph
$499.00 USD - $499.00 USD
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Askar Astrographe à champ plat 60F

Optique APO quadruplet de 60mm d'ouverture Focale de 408mm (f/6.8) Cercle image corrigé de 44mm plein format Aplanisseur de champ intégré Porte-oc...

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$499.00 USD - $499.00 USD
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Askar 65PHQ f/6.4 Quintuplet Flat-Field Astrograph
$899.00 USD - $899.00 USD
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Askar Astrographe à champ plat quintuplet 65PHQ f/6.4

Conception optique APO quintuplet de 65mm d'ouverture Focale de 416mm à f/6.4 Aplanisseur de champ intégré avec cercle image de 44mm Poids total d...

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$659.00 USD - $659.00 USD
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Askar Lunette APO quadruplet à champ plat 71F f/6.9

APO quadruplet à lame d'air de 71mm d'ouverture Focale de 490mm à f/6.9 Cercle image corrigé de 44mm plein format Conception à aplanisseur de cham...

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$659.00 USD - $659.00 USD
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$399.00 USD - $399.00 USD
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Askar Lunette doublet 80ED f/7

Ouverture de 80mm Focale de 560mm (f/7) Objectif doublet avec verre ED Tube optique de 1.7 kg Porte-oculaire à crémaillère double vitesse de 2" Op...

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Askar Lunette APO quadruplet 80PHQ f/7.5

Ouverture de 80mm Focale de 600mm (f/7.5) Optique APO quadruplet avec 2 éléments ED Cercle image corrigé de 44mm plein format Tube optique de 3.9k...

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Askar 91F Flat-Field Astrograph
$999.00 USD - $999.00 USD
$999.00 USD
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Askar Astrographe à champ plat 91F

Optique APO quadruplet de 91mm d'ouverture Focale de 609mm à f/6.7 Cercle image corrigé de 44mm plein format Conception à aplanisseur de champ int...

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$949.00 USD - $949.00 USD
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Askar Astrographe APO quintuplet FRA300 Pro 60mm f/5

Astrographe APO quintuplet de 60mm Focale de 300mm avec un rapport focal rapide de f/5 Cercle image corrigé de 44mm plein format Conception à corr...

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$949.00 USD - $949.00 USD
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Askar Astrographe APO quintuplet FRA400 72mm f/5.6

Objectif APO quintuplet de 72mm d'ouverture Focale de 400mm à f/5.6 Cercle image nativement plat de 44mm 140mm de backfocus disponible depuis le f...

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Askar Lunette APO quintuplet FRA400C 72mm f/5.6

Optique APO quintuplet de 72mm d'ouverture Focale de 400mm à f/5.6 Couvre un cercle image plein format de 44mm Diaphragme intégré à 17 lamelles (f...

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Askar Astrographe APO quintuplet FRA500 90mm f/5.6

Optique APO quintuplet de 90mm d'ouverture Focale de 500mm à f/5.6 Énorme cercle image nativement plat de 55mm Deux éléments en verre ED Poids tot...

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$2,599.00 USD - $2,599.00 USD
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Askar Astrographe quintuplet APO FRA600 108mm f/5.6

Ouverture de 108mm Focale de 600mm (f/5.6) Conception optique APO quintuplet à champ plat Cercle image corrigé de 66mm Poids total de 6.5kg (annea...

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$2,599.00 USD - $2,599.00 USD
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Askar Astrographe quintuplet APO SQA106 106mm f/4.8

Ouverture de 106mm Rapport focal de f/4.8 Focale de 509mm Conception optique APO Petzval quintuplet avec 2x verre SD Cercle image corrigé de 55mm ...

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$3,395.00 USD - $3,395.00 USD
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$3,395.00 USD

Doublets, Triplets and Glass Types

The purpose of an apochromatic design is to bring three wavelengths to a common focus, eliminating the violet halo that achromatic refractors show on bright stars. How well it does that depends on the glass and the number of elements.

  • ED doublets: Two elements with one extra-low dispersion element. Lighter, less expensive, and excellent for imaging, with a small residual colour that is rarely visible in processed images.
  • Apochromatic triplets: Three elements giving near-complete colour correction, preferred for high-contrast visual observing and for imaging bright stars without halos. Heavier and slower to cool.
  • Petzval designs: Four-element optics with the field correction built in, so no separate flattener is needed and back-focus is fixed by the manufacturer — the simplest path to flat fields.
  • Achromatic refractors: Two-element crown and flint designs, excellent value for lunar, planetary and general visual use where some colour fringing on bright objects is acceptable.
  • Focal ratio: Fast refractors around f/5 give wide fields and short exposures; f/7 and slower give more image scale and are more forgiving of corrector spacing.
  • Matched correctors: Most refractors need a flattener or reducer designed for that specific model, spaced to its exact back-focus.

Why Choose David Astro for Refractors

A refractor is usually bought as the centre of an imaging system, so it should be specified alongside the mount and camera rather than on its own.

  • Corrector matched at the point of sale: We identify the flattener or reducer designed for your specific tube and supply the spacers to hit its back-focus exactly.
  • Focuser load assessed: We check that the stock focuser will carry your intended camera train without slip, and recommend an upgrade only when it genuinely will not.
  • Authorized dealer: Full manufacturer warranty and verified authenticity, with service handled inside Canada.
  • Ships from Canadian stock: No duties or brokerage fees for Canadian buyers, and no extra border handling for a precision optic.
  • Support after first light: Help with spacing, tilt and star shape diagnosis once the telescope is on the sky.

Refractors in Canada — Frequently Asked Questions

Doublet or triplet for imaging?
A good ED doublet is entirely sufficient for most deep-sky imaging and is lighter on the mount. A triplet shows its advantage on bright stars and in high-contrast visual use, at meaningful extra weight and cost.
Do I need a field flattener?
For imaging with anything larger than a small sensor, yes — a two-element refractor has a curved focal plane and corners will show elongated stars without one. Petzval designs have it built in.
How long does a refractor take to cool?
A small doublet is usable almost immediately. A large triplet can take 45 minutes or more to stabilize in Canadian winter conditions, and imaging before it does will show soft, bloated stars.
Is a small refractor enough for deep sky?
Yes, given integration time. A 60 to 80 mm apochromat on a good mount produces excellent wide-field images; total exposure time substitutes for aperture in imaging in a way it cannot for visual work.

Specifying a refractor?

Tell us your mount, camera and targets and we will match the tube and its corrector. Canadian stock, no surprise duties.