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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.
William Optics

William Optics

William Optics has built its reputation on small apochromatic astrographs that are genuinely portable, mechanically well finished and easy to bring to focus — the RedCat and Zenithstar families in particular have become default recommendations for imagers who want wide fields without a heavy mount. David Astro stocks William Optics products in Canada, shipping from Canadian inventory.

We image with these telescopes here, and can tell you where the fixed back-focus of the Petzval designs simplifies your life and where a longer focal length model would serve your targets better.

Filtres

$178.00 - $178.00
$178.00
$178.00 - $178.00
$178.00

William Optics Anneaux de Montage 90mm

WO-M-M80R-B

Intégrez-le de manière transparente à votre équipement d'astrophotographie existant. Assure une fixation stable de votre télescope à votre mo...

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$178.00 - $178.00
$178.00
$178.00 - $178.00
$178.00
$158.00 - $158.00
$158.00
$158.00 - $158.00
$158.00

William Optics Renvoi Coudé Diélectrique Dura Bright 99% - 2"

WO-D-DIG2D-C-DB
3 en stock

Diagonale de 2" de haute qualité pour télescopes réfracteurs et catadioptriques Revêtement diélectrique à réflectivité de 99 % pour une t...

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$158.00 - $158.00
$158.00
$158.00 - $158.00
$158.00
William Optics 1.25" 90° Erect Prism for Cat 61 WIFD
$159.00 - $159.00
$159.00
$159.00 - $159.00
$159.00

William Optics 1.25" 90° Erect Prism for Cat 61 WIFD

WO-D-EP90-125-RC61
1 en stock

Provides a fully corrected, erect image for terrestrial viewing Comfortable 90° viewing angle Standard 1.25" barrel accepts most astronomical eyep...

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$159.00 - $159.00
$159.00
$159.00 - $159.00
$159.00
$159.00 - $159.00
$159.00
$159.00 - $159.00
$159.00

William Optics Prisme Érecteur pour RedCat - Version Argent 1.25"

WO-D-EP90-125-RC51III
1 en stock

Prisme érigé de 1,25" pour une orientation correcte de l'image Conception à finition argentée spécialement conçue pour les télescopes Red...

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$159.00 - $159.00
$159.00
$159.00 - $159.00
$159.00
$156.00 - $156.00
$156.00
$156.00 - $156.00
$156.00

William Optics Oculaire SWAN 72° 40mm - 2"

WO-E-SWA40
4 en stock

Oculaire de 2 pouces avec champ de vision apparent de 72° Distance focale de 40 mm pour une visualisation à grand champ et à faible gross...

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$156.00 - $156.00
$156.00
$156.00 - $156.00
$156.00
$148.00 - $178.00
$148.00 - $178.00
$148.00 - $178.00
$148.00

William Optics Lunette de Guidage 50mm

Options available
1 variants in stock

Facilitez la recherche et le suivi des étoiles guides Convivial et peut être configuré rapidement Description La lunette de...

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$148.00 - $178.00
$148.00 - $178.00
$148.00 - $178.00
$148.00
$141.00 - $141.00
$141.00
$141.00 - $141.00
$141.00

William Optics Platine / Poignée - 243mm avec Anneaux 50mm

WO-M-HC243BL-GR50IISL

Compatible avec les anneaux de guidage à base coulissante de William Optics Peut être utilisé pour rendre les télescopes William Optics portab...

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$141.00 - $141.00
$141.00
$141.00 - $141.00
$141.00
$138.00 - $138.00
$138.00
$138.00 - $138.00
$138.00

William Optics Adaptateur STL pour Aplanisseur FLT

WO-P-STL

Adaptateur STL conçu pour les aplatisseurs William Optics FLT Assure une connexion sécurisée entre votre aplatisseur FLT et la caméra STL...

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$138.00 - $138.00
$138.00
$138.00 - $138.00
$138.00
$138.00 - $138.00
$138.00
$138.00 - $138.00
$138.00

William Optics Renvoi Coudé Diélectrique Dura Bright 99% - 1.25"

WO-D-125D-C-DB
1 en stock

Diagonale de 1,25" de haute qualité pour télescopes réfracteurs et catadioptriques Revêtement diélectrique à réflectivité de 99 % pour un...

Afficher tous les détails
$138.00 - $138.00
$138.00
$138.00 - $138.00
$138.00
$137.00 - $137.00
$137.00
$137.00 - $137.00
$137.00

William Optics Lunette de Guidage Slide-Base UniGuide 32mm

Options available
7 variants in stock

Lunette de guidage compacte de 32 mm Distance focale de 120 mm À utiliser avec les caméras de guidage de 1,25" Description ...

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$137.00 - $137.00
$137.00
$137.00 - $137.00
$137.00
$129.00 - $129.00
$129.00
$129.00 - $129.00
$129.00

William Optics Rotateur d'Angle de Caméra pour Porte-Oculaire 2.5" M63

WO-M-CAA63
1 en stock

Rotateur d'angle de caméra conçu pour le porte-oculaire William Optics 2,5" M63 Permet un réglage précis de l'angle de la caméra pour un ...

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$129.00 - $129.00
$129.00
$129.00 - $129.00
$129.00
$116.00 - $139.00
$116.00 - $139.00
$116.00 - $139.00
$116.00

William Optics Série D - Barre à queue d'aronde

Options available
3 variants in stock

Plaque à queue d'aronde de style Losmandy (Type D) par William Optics Compatible avec une variété de télescopes et de montures ...

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$116.00 - $139.00
$116.00 - $139.00
$116.00 - $139.00
$116.00
William Optics M54 Camera Angle Rotator (CAA)
$119.00 - $119.00
$119.00
$119.00 - $119.00
$119.00

William Optics M54 Camera Angle Rotator (CAA)

WO-M-CAA54
1 en stock

360° of precise framing rotation Standard M54 male and female threads Adds a minimal 30.2 mm to the optical path Securely locks orientation for lo...

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$119.00 - $119.00
$119.00
$119.00 - $119.00
$119.00
$118.00 - $118.00
$118.00
$118.00 - $118.00
$118.00

William Optics Platine / Poignée - 120mm avec Anneaux 50mm

WO-M-HC120BL-GR50SL

Fournit une plate-forme stable pour fixer des lunettes de guidage et d'autres accessoires Convivial et peut être configuré rapidement Facil...

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$118.00 - $118.00
$118.00
$118.00 - $118.00
$118.00
$113.00 - $113.00
$113.00
$113.00 - $113.00
$113.00

William Optics Masque De Bahtinov / Capuchon pour GT81 / Z81

Options available

Cache masque Bahtinov pour télescopes William Optics GT81 et Z81 Améliore la précision de la mise au point pour l'astrophotographie De...

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$113.00 - $113.00
$113.00
$113.00 - $113.00
$113.00
$116.00 - $116.00
$116.00
$116.00 - $116.00
$116.00

William Optics Prisme 90° - 1.25"

WO-D-EP90-125II
5 en stock

Prisme érigé à 90 degrés pour oculaires de télescope de 1,25" Fournit une orientation correcte de l’image pour la visualisation terrestre...

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$116.00 - $116.00
$116.00
$116.00 - $116.00
$116.00
$108.00 - $108.00
$108.00
$108.00 - $108.00
$108.00

William Optics Oculaire SPL 55° 12,5mm - 1.25"

WO-E-SPL12.5

Oculaire de 1,25 pouces avec champ de vision apparent de 55° Distance focale de 12,5 mm pour une visualisation à grossissement moyen-élev...

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$108.00 - $108.00
$108.00
$108.00 - $108.00
$108.00
$110.00 - $110.00
$110.00
$110.00 - $110.00
$110.00

William Optics Prisme 45° - 1.25"

WO-D-EP125
6 en stock

Prisme érectile à 45 degrés pour oculaires de télescope de 1,25" Fournit une orientation correcte de l’image pour la visualisation terres...

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$110.00 - $110.00
$110.00
$110.00 - $110.00
$110.00
$108.00 - $108.00
$108.00
$108.00 - $108.00
$108.00

William Optics Platine / Poignée - 243mm

WO-M-HC243BL
1 en stock

Fournit une plate-forme stable pour fixer des lunettes de guidage et d'autres accessoires Convivial et peut être configuré rapidement Facili...

Afficher tous les détails
$108.00 - $108.00
$108.00
$108.00 - $108.00
$108.00
$108.00 - $108.00
$108.00
$108.00 - $108.00
$108.00

William Optics Bague Adaptatrice COPPER super Haute précision pour Nikon Plein Format

WO-YE-TR-BR48-N

Monture en T de très haute précision conçue pour les appareils photo plein format Nikon Construit à partir de cuivre durable pour une sta...

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$108.00 - $108.00
$108.00
$108.00 - $108.00
$108.00
$108.00 - $108.00
$108.00
$108.00 - $108.00
$108.00

William Optics Bague Adaptatrice COPPER Super Haute Précision pour Canon EOS Plein Format

WO-YE-TR-BR48-C
1 en stock

Monture en T de très haute précision conçue pour les appareils photo plein format Canon EOS Construit à partir de cuivre durable pour une...

Afficher tous les détails
$108.00 - $108.00
$108.00
$108.00 - $108.00
$108.00
$108.00 - $108.00
$108.00
$108.00 - $108.00
$108.00

William Optics Masque De Bahtinov / Capuchon pour WO Z61

WO-CPBM-61GD

Aide à la mise au point de précision pour le télescope William Optics Z61 Conçu sur mesure pour s'adapter parfaitement au modèle Z61 ...

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$108.00 - $108.00
$108.00
$108.00 - $108.00
$108.00
$108.00 - $108.00
$108.00
$108.00 - $108.00
$108.00

William Optics Masque de Bahtinov 243-308mm

WO-BM-DS-GR150

Conçu pour les télescopes avec des ouvertures comprises entre 243 mm et 308 mm Aide à la mise au point précise pour les télescopes à gra...

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$108.00 - $108.00
$108.00
$108.00 - $108.00
$108.00
$102.00 - $118.00
$102.00 - $118.00
$102.00 - $118.00
$102.00

William Optics Masque De Bahtinov / Capuchon pour GT71 / Z73 / Star71II

Options available

Couvercle de masque Bahtinov pour télescopes William Optics GT71, Z73 et Star71II Améliore la précision de la mise au point pour l'astrophoto...

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$102.00 - $118.00
$102.00 - $118.00
$102.00 - $118.00
$102.00

The William Optics Range

The line divides fairly cleanly between Petzval astrographs with built-in field correction and traditional doublets and triplets that use a separate flattener.

  • RedCat and Petzval astrographs: Four-element designs with the flattener integrated, giving a flat field at a fixed back-focus with no spacing calculation required — the simplest imaging optics to set up correctly.
  • Zenithstar apochromatic refractors: Compact FPL-53 doublets from 61 mm upward, popular as first imaging telescopes and as guide or companion scopes on larger rigs.
  • GT and FLT triplet refractors: Larger apochromatic triplets for imagers who want more aperture and focal length while keeping a refractor's convenience.
  • UniGuide guide scopes: Rigid guide scopes with integrated mounting that avoids the flexure common to ring-and-bracket guide setups.
  • RotoLock and mechanical accessories: Rotating locking collars, dovetails, tube rings and Bahtinov masks designed to fit the tubes precisely.
  • Diagonals and eyepieces: Dielectric diagonals and eyepiece lines matched to the refractors for visual use.

Why Choose David Astro for William Optics

These telescopes are straightforward to use and easy to buy in the wrong focal length. That is where the advice matters.

  • Focal length matched to targets: We calculate the field of view your sensor will get on each model, so you can see whether your target actually fits before ordering.
  • Petzval back-focus supplied: The integrated designs have a fixed spacing requirement, and we provide the exact adapter list for your camera and filter setup.
  • Authorized dealer: Full manufacturer warranty with verified authenticity, handled domestically in Canada.
  • Canadian stock: Ships from Canada with no duties or brokerage fees for Canadian orders.
  • Support after first light: Help diagnosing tilt, spacing and star shape once the telescope is on the sky.

William Optics in Canada — Frequently Asked Questions

Do RedCat telescopes need a flattener?
No. The Petzval design includes field correction, so you only need to hit the specified back-focus to the camera sensor. That is one of the main reasons they are recommended to first-time imagers.
Which focal length should I choose?
It depends on your target size and sensor. Around 250 mm suits large nebulae and the Andromeda galaxy; 400 to 600 mm frames most emission nebulae well; beyond that you are into small galaxies and planetary nebulae, which also demands better guiding.
Can these work as guide scopes?
The smaller Zenithstars and the UniGuide range are commonly used this way. The key advantage of a purpose-built guide scope is rigidity — a flexing guide scope produces errors that guiding cannot correct.
Is warranty handled in Canada?
Yes. As an authorized dealer we process warranty and service claims here, without international shipping or customs paperwork.

Choosing a focal length?

Send us your camera and your target list and we will show you the framing. Canadian stock, full warranty.