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Adaptateurs

Almost every imaging train problem in astrophotography — soft corners, elongated stars, a camera that will not come to focus — traces back to a few millimetres of the wrong adapter. David Astro carries adapters in Canada covering M42, M48, M54, M68, SCT and Nikon and Canon bayonet standards, along with barrel adapters in 1.25" and 2", all in stock and shipping from Canada.

Adapters are the one product category where buying blind is genuinely expensive. Our team calculates back-focus and thread compatibility for customers every day, so before you assemble a stack from guesswork, send us your components and we will specify the parts.

Filtres

William Optics 30mm Flattener Adapter
CA$80.00 - CA$80.00
CA$80.00
CA$80.00 - CA$80.00
CA$80.00

William Optics 30mm Flattener Adapter

WO-AD-M80TOM54

30mm Optical Length Connects M80 x 0.75 to M54 x 0.75 Threads For William Optics Flat68III & Flat7A Flatteners Description FAQ Specificatio...

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CA$80.00 - CA$80.00
CA$80.00
CA$80.00 - CA$80.00
CA$80.00
William Optics 4" Extender for FLT Series
CA$94.00 - CA$94.00
CA$94.00
CA$94.00 - CA$94.00
CA$94.00

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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CA$94.00 - CA$94.00
CA$94.00
CA$94.00 - CA$94.00
CA$94.00
CA$92.00 - CA$92.00
CA$92.00
CA$92.00 - CA$92.00
CA$92.00

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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CA$92.00 - CA$92.00
CA$92.00
CA$92.00 - CA$92.00
CA$92.00
CA$54.00 - CA$54.00
CA$54.00
CA$54.00 - CA$54.00
CA$54.00

William Optics Bague Adaptatrice 48mm pour Canon

WO-TM-CN-EOS-M48
4 en stock

Permet une installation simple Fabriqué avec une CNC améliorée pour une plus grande rigidité Description Compatible avec les a...

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CA$54.00 - CA$54.00
CA$54.00
CA$54.00 - CA$54.00
CA$54.00
CA$94.00 - CA$94.00
CA$94.00
CA$94.00 - CA$94.00
CA$94.00

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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CA$94.00 - CA$94.00
CA$94.00
CA$94.00 - CA$94.00
CA$94.00
CA$76.00 - CA$76.00
CA$76.00
CA$76.00 - CA$76.00
CA$76.00

William Optics Monture en T 48mm pour Fuji FX - Noir

WO-TM-FJ-X-M48
1 en stock

Adaptateur de montage en T M48 de haute précision Pour les appareils photo de la série Fuji FX Description La monture en T 48...

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CA$76.00 - CA$76.00
CA$76.00
CA$76.00 - CA$76.00
CA$76.00
CA$54.00 - CA$54.00
CA$54.00
CA$54.00 - CA$54.00
CA$54.00

William Optics Bague Adaptatrice 48mm pour Nikon F

WO-TM-NK-F-M48
2 en stock

Monture en T de 48 mm conçue pour les appareils photo Nikon à monture F Assure une connexion sécurisée et précise entre votre caméra et v...

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CA$54.00 - CA$54.00
CA$54.00
CA$54.00 - CA$54.00
CA$54.00
CA$94.00 - CA$94.00
CA$94.00
CA$94.00 - CA$94.00
CA$94.00

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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CA$94.00 - CA$94.00
CA$94.00
CA$94.00 - CA$94.00
CA$94.00
CA$54.00 - CA$54.00
CA$54.00
CA$54.00 - CA$54.00
CA$54.00

William Optics Monture en T 48 mm pour Pentax K - Noir

WO-TM-PT-K-M48
1 en stock

Adaptateur de montage en T M48 de haute précision Pour les appareils photo Pentax de la série K Description La monture en T 4...

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CA$54.00 - CA$54.00
CA$54.00
CA$54.00 - CA$54.00
CA$54.00
CA$76.00 - CA$76.00
CA$76.00
CA$76.00 - CA$76.00
CA$76.00

William Optics Monture en T 48 mm pour Sony E - Noir

WO-TM-SN-E-M48
3 en stock

Monture en T de 48 mm conçue spécifiquement pour les appareils photo Sony à monture E Permet une connexion transparente entre votre appar...

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CA$76.00 - CA$76.00
CA$76.00
CA$76.00 - CA$76.00
CA$76.00
William Optics 54mm Flattener Extender for GT81 WIFD
CA$94.00 - CA$94.00
CA$94.00
CA$94.00 - CA$94.00
CA$94.00

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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CA$94.00 - CA$94.00
CA$94.00
CA$94.00 - CA$94.00
CA$94.00
CA$88.00 - CA$88.00
CA$88.00
CA$88.00 - CA$88.00
CA$88.00

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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CA$88.00 - CA$88.00
CA$88.00
CA$88.00 - CA$88.00
CA$88.00
CA$88.00 - CA$88.00
CA$88.00
CA$88.00 - CA$88.00
CA$88.00

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...

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CA$88.00 - CA$88.00
CA$88.00
CA$88.00 - CA$88.00
CA$88.00
CA$88.00 - CA$88.00
CA$88.00
CA$88.00 - CA$88.00
CA$88.00

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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CA$88.00 - CA$88.00
CA$88.00
CA$88.00 - CA$88.00
CA$88.00
CA$83.00 - CA$83.00
CA$83.00
CA$83.00 - CA$83.00
CA$83.00

William Optics Ajusteur d'Inclinaison du Plan d'Image

WO-M-FD-RC51

Ajusteur d'inclinaison du plan d'image conçu pour un alignement précis Améliore la qualité de l'image en corrigeant l'inclinaison du chem...

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CA$83.00 - CA$83.00
CA$83.00
CA$83.00 - CA$83.00
CA$83.00
CA$80.00 - CA$80.00
CA$80.00
CA$80.00 - CA$80.00
CA$80.00

William Optics Adaptateur de réglage plus long pour FLAT68III, FLAT7A

WO-AD-M80-45-M48

Plage de réglage plus longue pour une mise au point plus précise Compatible avec les télescopes FLAT68III et FLAT7A Permet un réglage plus pr...

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CA$80.00 - CA$80.00
CA$80.00
CA$80.00 - CA$80.00
CA$80.00
CA$21.00 - CA$21.00
CA$21.00
CA$21.00 - CA$21.00
CA$21.00

William Optics Adaptateur M48(F) vers M42(M)

WO-YE-M48-42

Adaptateur M48 femelle vers M42 mâle pour des options de connexion polyvalentes Permet une intégration transparente entre les accessoires...

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CA$21.00 - CA$21.00
CA$21.00
CA$21.00 - CA$21.00
CA$21.00
CA$54.00 - CA$54.00
CA$54.00
CA$54.00 - CA$54.00
CA$54.00

William Optics Adaptateur Photo Coulant 2" - M48

WO-WD-DIG2A
1 en stock

Embout nasal M48 pour diagonales WO 2" et lunettes UniGuide Permet une intégration facile d'accessoires 2" avec les lunettes William Opti...

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CA$54.00 - CA$54.00
CA$54.00
CA$54.00 - CA$54.00
CA$54.00
CA$66.00 - CA$66.00
CA$66.00
CA$66.00 - CA$66.00
CA$66.00

William Optics Adaptateur Push-To M63(f) vers 2" pour P-FLAT6AIII

WO-YE-M63F-2IN-PI
1 en stock

Adaptateur M63 femelle vers 2" push-in conçu pour le P-FLAT6AIII Facilite la connexion entre votre télescope et divers accessoires 2" ...

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CA$66.00 - CA$66.00
CA$66.00
CA$66.00 - CA$66.00
CA$66.00
CA$92.00 - CA$92.00
CA$92.00
CA$92.00 - CA$92.00
CA$92.00

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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CA$92.00 - CA$92.00
CA$92.00
CA$92.00 - CA$92.00
CA$92.00
William Optics M92 to M63 Adapter for William Optics FLT91
CA$121.00 - CA$121.00
CA$121.00
CA$121.00 - CA$121.00
CA$121.00

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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CA$121.00 - CA$121.00
CA$121.00
CA$121.00 - CA$121.00
CA$121.00
CA$65.00 - CA$65.00
CA$65.00
CA$65.00 - CA$65.00
CA$65.00

William Optics Bague Adaptatrice Micro 4/3 48mm pour Olympus - Grise

WO-TM-MFT-M48
3 en stock

Support en T Micro 4/3 48 mm conçu pour les appareils photo Olympus Permet une connexion transparente entre votre appareil photo Olympus ...

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CA$65.00 - CA$65.00
CA$65.00
CA$65.00 - CA$65.00
CA$65.00
CA$62.00 - CA$62.00
CA$62.00
CA$62.00 - CA$62.00
CA$62.00

William Optics Connexion SCT pour Renvois Coudés WO - Or

WO-D-SCT-TA

Adaptateur pour connecter les télescopes Schmidt-Cassegrain aux diagonales William Optics Finition anodisée or pour plus de durabilité et...

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CA$62.00 - CA$62.00
CA$62.00
CA$62.00 - CA$62.00
CA$62.00
CA$190.00 - CA$190.00
CA$190.00
CA$190.00 - CA$190.00
CA$190.00

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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CA$190.00 - CA$190.00
CA$190.00
CA$190.00 - CA$190.00
CA$190.00

Understanding Thread Standards and Back-Focus

An adapter does two things at once: it changes the connection type, and it changes the distance between your corrector and your sensor. The second effect is the one that causes trouble, because most reducers and flatteners have a back-focus tolerance of about one millimetre.

  • M42 (T-thread, 0.75 mm pitch): The long-standing standard for camera adapters. Its clear aperture will vignette sensors larger than APS-C, so full-frame imaging trains should avoid it.
  • M48 (2" thread, 0.75 mm pitch): The practical choice for APS-C and full-frame sensors, with enough clear aperture to avoid mechanical vignetting.
  • M54 and M68: Larger-diameter threads used by heavier astrographs and larger-format correctors where rigidity and aperture both matter.
  • SCT 2"-24 TPI: The rear-cell thread on Schmidt-Cassegrains; requires a specific adapter to reach M42 or M48 for imaging.
  • Bayonet adapters: Canon EF and Nikon F adapters place a DSLR or mirrorless body at the correct flange distance, typically 44 mm and 46.5 mm respectively.
  • Fine-tuning spacers: 0.5 mm, 1 mm and 2 mm shims that let you land exactly on a corrector's specified spacing rather than near it.

Why Choose David Astro for Adapters

An adapter is a cheap part that determines whether an expensive telescope performs. We treat it that way.

  • Free back-focus calculation: Give us your camera, filter thickness, reducer and telescope and we will return a component list with the total spacing worked out.
  • Filter thickness accounted for: Glass in the light path shifts focus by roughly one third of its thickness, and we include that in the calculation rather than leaving you to discover it.
  • Male and female threads identified: We specify the gender and standard on both ends, which is the detail most listings omit.
  • Deep Canadian stock: Hundreds of adapters held domestically, so a missing 10 mm spacer does not cost you three weeks of clear sky.
  • Authorized dealer: Genuine manufacturer parts with full warranty, shipped from Canada without duties for Canadian buyers.

Adapters in Canada — Frequently Asked Questions

How do I calculate my back-focus?
Add your camera's sensor-to-flange distance, any filter wheel or off-axis guider, the filter's optical shift, and every spacer between the camera and the corrector. That total must match the corrector's specified figure, usually 55 mm for a standard reducer.
Should I use M42 or M48?
Use M48 for any sensor larger than APS-C. M42 has enough clear aperture for smaller sensors but will mechanically vignette a full-frame chip regardless of the optics ahead of it.
Do filters change my spacing?
Yes. A filter shifts the focal plane by about one third of its glass thickness. A 3 mm filter adds roughly 1 mm to the effective optical path, which is enough to matter at a 55 mm target.
What if I order the wrong adapter?
Contact us with your setup before ordering and we will confirm the parts. That is a faster path than exchanges, and it is a service we provide free.

Send us your imaging train

We will calculate the spacing and specify every adapter you need. Canadian stock, no guesswork.