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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

William Optics Mounting Ring for Z61
$99.00 - $99.00
$99.00
$99.00 - $99.00
$99.00

William Optics Mounting Ring for Z61

WO-M-R-61BL-P

Designed specifically for the William Optics ZenithStar 61 I Provides a secure, rigid mounting point for the optical tube Features an integrated C...

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$99.00 - $99.00
$99.00
$99.00 - $99.00
$99.00
$98.00 - $98.00
$98.00
$98.00 - $98.00
$98.00

William Optics Adaptateur RotoLock 1.25" - SCT

WO-F-ROTO-A2-125-SCT-TA

Adaptateur arrière visuel RotoLock de 1,25" conçu pour les filetages SCT Assure une connexion sécurisée et précise pour les accessoires d...

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$98.00 - $98.00
$98.00
$98.00 - $98.00
$98.00
$91.00 - $91.00
$91.00
$91.00 - $91.00
$91.00

William Optics Série V - Barre à queue d'aronde - Version Longue

WO-M-PV-LII-RD
2 en stock

Stabilité accrue, notamment pour les tubes optiques plus lourds ou plus longs. Conçu pour s'adapter aux supports à queue d'aronde de style ...

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$91.00 - $91.00
$91.00
$91.00 - $91.00
$91.00
$90.00 - $90.00
$90.00
$90.00 - $90.00
$90.00

Adaptateur de tête de pilier de mortier William Optics - Montage à vis 3/8"

WO-YG-38-MTAD-BL

Conçu pour s'adapter à une jetée filetée de 3/8". Filetage universel 3/8" Garantie à vie limitée Description garantie ...

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$90.00 - $90.00
$90.00
$90.00 - $90.00
$90.00
$88.00 - $88.00
$88.00
$88.00 - $88.00
$88.00

William Optics Adaptateur RotoLock 2"- M63

WO-F-ROTO-A63SL

Adaptateur RotoLock 2" conçu pour les filetages M63 Assure une connexion sécurisée et précise pour les accessoires 2" Descript...

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$88.00 - $88.00
$88.00
$88.00 - $88.00
$88.00
$85.00 - $85.00
$85.00
$85.00 - $85.00
$85.00

William Optics Chercheur Point Rouge avec base Style Vixen

WO-M-RDF-P-VBII
8 en stock

Chercheur de point rouge pour une acquisition facile de la cible Comprend une base de montage de style Vixen pour une fixation polyvalent...

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$85.00 - $85.00
$85.00
$85.00 - $85.00
$85.00
William Optics M92 to M63 Adapter for William Optics FLT91
$88.00 - $88.00
$88.00
$88.00 - $88.00
$88.00

William Optics M92 to M63 Adapter for William Optics FLT91

WO-YE-M92-63

Connects William Optics FLT91 Telescope to Flat6AIII Flattener Input Thread: M92 Male Output Thread: M63 Female Optical Path Length: 10.5 mm De...

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$88.00 - $88.00
$88.00
$88.00 - $88.00
$88.00
$88.00 - $88.00
$88.00
$88.00 - $88.00
$88.00

William Optics Masque de Bahtinov 172mm -235mm

WO-BM-DS-GR90

Conçu pour les télescopes avec des ouvertures comprises entre 172 mm et 235 mm Aide à la mise au point précise pour l'astrophotographie e...

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$88.00 - $88.00
$88.00
$88.00 - $88.00
$88.00
$80.00 - $80.00
$80.00
$80.00 - $80.00
$80.00

William Optics Série V- Support de Montage pour RedCat - Base Noire

WO-M-FB50-RC-BB

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

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$80.00 - $80.00
$80.00
$80.00 - $80.00
$80.00
$79.00 - $79.00
$79.00
$79.00 - $79.00
$79.00

William Optics Série V - Platine 90mm

WO-M-SP90RC-RD
1 en stock

Usiné avec précision à partir d'aluminium de haute qualité pour un ajustement parfait Description La plaque de selle William Op...

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$79.00 - $79.00
$79.00
$79.00 - $79.00
$79.00
$76.00 - $76.00
$76.00
$76.00 - $76.00
$76.00

William Optics Anneau Amélioré pour ZenithStar V1

Options available

Permet une installation simple Fabriqué avec une CNC améliorée pour une plus grande rigidité Description L'anneau de montage ...

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$76.00 - $76.00
$76.00
$76.00 - $76.00
$76.00
$76.00 - $76.00
$76.00
$76.00 - $76.00
$76.00

William Optics Anneaux de Guidage Slide-Base 50mm

WO-M-GR50SL
1 en stock

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

Afficher tous les détails
$76.00 - $76.00
$76.00
$76.00 - $76.00
$76.00
$76.00 - $76.00
$76.00
$76.00 - $76.00
$76.00

William Optics Série V- Support de Montage pour Chercheur

WO-M-FB50-B
1 en stock

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

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$76.00 - $76.00
$76.00
$76.00 - $76.00
$76.00
William Optics 4" Extender for FLT Series
$68.00 - $68.00
$68.00
$68.00 - $68.00
$68.00

William Optics 4" Extender for FLT Series

WO-P-M92EX

Adds 67 mm of optical length to your imaging train Features M92 male and female threads for a secure connection Designed for William Optics FLT 11...

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$68.00 - $68.00
$68.00
$68.00 - $68.00
$68.00
William Optics 54mm Flattener Extender for GT81 WIFD
$68.00 - $68.00
$68.00
$68.00 - $68.00
$68.00

William Optics 54mm Flattener Extender for GT81 WIFD

WO-AD-M80-54-M48

Provides a precise 54mm of optical length Connects the FLAT68III flattener to M48 imaging trains Designed specifically for the William Optics Gran...

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$68.00 - $68.00
$68.00
$68.00 - $68.00
$68.00
$68.00 - $68.00
$68.00
$68.00 - $68.00
$68.00

William Optics Monture en T 48 mm pour Canon EOS R Hybride

WO-TM-CN-EOSR-M48
3 en stock

Adaptateur de montage en T M48 de haute précision Pour les appareils photo reflex numériques sans miroir Canon EOS R Description ...

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$68.00 - $68.00
$68.00
$68.00 - $68.00
$68.00
$68.00 - $68.00
$68.00
$68.00 - $68.00
$68.00

Monture en T William Optics 48 mm pour Nikon Z

WO-TM-NK-Z-M48

Adaptateur de montage en T M48 de haute précision Pour les appareils photo reflex numériques sans miroir Canon EOS R Description ...

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$68.00 - $68.00
$68.00
$68.00 - $68.00
$68.00
$68.00 - $68.00
$68.00
$68.00 - $68.00
$68.00

William Optics Masque de Bahtinov 105-148mm

WO-BM-DS-GR55

Conçu pour les télescopes avec des ouvertures comprises entre 105 mm et 148 mm Aide à la mise au point précise pour l'astrophotographie e...

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$68.00 - $68.00
$68.00
$68.00 - $68.00
$68.00
$64.00 - $64.00
$64.00
$64.00 - $64.00
$64.00

William Optics Anneaux de Guidage Slide-Base 50mm - Pas de Vis de Réglage

WO-M-GR50IISL

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

Afficher tous les détails
$64.00 - $64.00
$64.00
$64.00 - $64.00
$64.00
$64.00 - $64.00
$64.00
$64.00 - $64.00
$64.00

William Optics Adaptateur Photo M63(M) à M48(M)

WO-P-PAM-63-48

Adaptateur photo M63 mâle vers M48 mâle pour des options de connexion polyvalentes Facilite l'intégration transparente entre les accessoi...

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$64.00 - $64.00
$64.00
$64.00 - $64.00
$64.00
$64.00 - $64.00
$64.00
$64.00 - $64.00
$64.00

William Optics Tube d'Extension 4" pour Série FLT

WO-P-EXFLT

Tube d'extension de 4" conçu pour la série William Optics FLT Fournit une mise au point arrière supplémentaire pour diverses configuratio...

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$64.00 - $64.00
$64.00
$64.00 - $64.00
$64.00
$64.00 - $64.00
$64.00
$64.00 - $64.00
$64.00

William Optics Adaptateur Flat4 à FLT (or) - pour Porte-Oculaires Modèles 2007-2016

WO-AD4-A006-L00GD03

Conçu pour les télescopes William Optics FLT (modèles 2007-2016) Finition dorée pour un attrait esthétique Description ...

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$64.00 - $64.00
$64.00
$64.00 - $64.00
$64.00
$64.00 - $64.00
$64.00
$64.00 - $64.00
$64.00

William Optics Adaptateur Flat4 à GT102, FLT 132 - Bleu pour Porte-Oculaire 3" V-Power

WO-AD4-A006-L00BU03

Conçu pour les télescopes William Optics GT102 et FLT 132 avec focuser V-power 3" Finition de couleur bleue pour un attrait esthétique ...

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$64.00 - $64.00
$64.00
$64.00 - $64.00
$64.00
$64.00 - $64.00
$64.00
$64.00 - $64.00
$64.00

William Optics Adaptateur Flat4 à GT102, FLT 132 - Noir pour Porte-Oculaire 3" V-Power

WO-AD4-A006-L00BL03

Conçu pour les télescopes William Optics GT102 et FLT 132 avec focuser V-Power 3" Finition de couleur noire pour un look élégant et profe...

Afficher tous les détails
$64.00 - $64.00
$64.00
$64.00 - $64.00
$64.00

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.