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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

CA$86.00 - CA$86.00
CA$86.00
CA$86.00 - CA$86.00
CA$86.00

Baader Tube d'Extension M68 - 20mm

BAA-2458202

Tube prolongateur M68 Utile pour la projection d'oculaire classique, les télécentriques ou les convertisseurs de champ plat en fluorite (FFC) 12...

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CA$86.00 - CA$86.00
CA$86.00
CA$86.00 - CA$86.00
CA$86.00
CA$89.00 - CA$89.00
CA$89.00
CA$89.00 - CA$89.00
CA$89.00

Baader Tube d'Extension M68 - 40mm

BAA-2458204

Tube prolongateur M68 Utile pour la projection d'oculaire classique, les télécentriques ou les convertisseurs de champ plat en fluorite (FFC) 40...

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CA$89.00 - CA$89.00
CA$89.00
CA$89.00 - CA$89.00
CA$89.00
CA$120.00 - CA$120.00
CA$120.00
CA$120.00 - CA$120.00
CA$120.00

Baader Tube d'Extension M68 - 60mm

BAA-2458206

Tube prolongateur M68 Utile pour la projection d'oculaire classique, les télécentriques ou les convertisseurs de champ plat en fluorite (FFC) 60...

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CA$120.00 - CA$120.00
CA$120.00
CA$120.00 - CA$120.00
CA$120.00
CA$69.00 - CA$69.00
CA$69.00
CA$69.00 - CA$69.00
CA$69.00

Baader Tube d'Extension M68 - 7.5mm

BAA-2458212

Tube prolongateur M68 Utile pour la projection d'oculaire classique, les télécentriques ou les convertisseurs de champ plat en fluorite (FFC) 7...

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CA$69.00 - CA$69.00
CA$69.00
CA$69.00 - CA$69.00
CA$69.00
CA$136.00 - CA$136.00
CA$136.00
CA$136.00 - CA$136.00
CA$136.00

Baader Tube d'Extension M68 - 80mm

BAA-2458208
1 en stock

Tube prolongateur M68 Utile pour la projection d'oculaire classique, les télécentriques ou les convertisseurs de champ plat en fluorite (FFC) 80...

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CA$136.00 - CA$136.00
CA$136.00
CA$136.00 - CA$136.00
CA$136.00
CA$13.00 - CA$14.00
CA$13.00 - CA$14.00
CA$13.00 - CA$14.00
CA$13.00

Bague en aluminium à réglage fin Baader M68 - 0,3/0,5/1 mm

Options available

Système M68 - bagues d'espacement (Fine-Adjustment), disponibles en épaisseurs de 0,3 mm (noir), 0,5 mm (rouge), 1 mm (or) Anneaux très fins ut...

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CA$13.00 - CA$14.00
CA$13.00 - CA$14.00
CA$13.00 - CA$14.00
CA$13.00
CA$641.00 - CA$641.00
CA$641.00
CA$641.00 - CA$641.00
CA$641.00

Baader Tele-Compendium M68

BAA-2459258

Connexion télescopique pour Baader FFC et systèmes télécentriques Composé de 9 composants : 1x adaptateur Four-In-One (T-2 version) M68/T-2/M68...

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CA$641.00 - CA$641.00
CA$641.00
CA$641.00 - CA$641.00
CA$641.00
CA$46.00 - CA$46.00
CA$46.00
CA$46.00 - CA$46.00
CA$46.00

Baader Adaptateur Morpheus - M43/M54

BAA-2954251
1 en stock

Adaptateur Morpheus® pour convertir le filetage supérieur externe Morpheus M43 en un filetage externe SP54 - sans augmenter la hauteur optique C...

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CA$46.00 - CA$46.00
CA$46.00
CA$46.00 - CA$46.00
CA$46.00
CA$40.00 - CA$40.00
CA$40.00
CA$40.00 - CA$40.00
CA$40.00

Baader Coulant - 1.25"/T-2

BAA-2458105
1 en stock

Embout 1¼" avec filetage T-2 et porte-filtre M28,5 Canon avec rainure d'insertion et de fixation de 24 mm Côté foyer avec filetage externe T-2 ...

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CA$40.00 - CA$40.00
CA$40.00
CA$40.00 - CA$40.00
CA$40.00
CA$59.00 - CA$59.00
CA$59.00
CA$59.00 - CA$59.00
CA$59.00

Baader Coulant - Filetage SCT(M) 2"/2"

BAA-2408155

Embout de nez ultra dur de 2" avec rainure de sécurité Filetage mâle 50,8 mm côté mise au point (filetage SCT) Côté télescope 2" avec filetage ...

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CA$59.00 - CA$59.00
CA$59.00
CA$59.00 - CA$59.00
CA$59.00
CA$60.00 - CA$60.00
CA$60.00
CA$60.00 - CA$60.00
CA$60.00

Baader Coulant - 2"/S52

BAA-2958551

Embout de nez ultra dur 2" / S52 avec rainure de sécurité Bague en queue d'aronde S52 côté mise au point Corps de 2" côté télescope avec fileta...

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CA$60.00 - CA$60.00
CA$60.00
CA$60.00 - CA$60.00
CA$60.00
CA$59.00 - CA$59.00
CA$59.00
CA$59.00 - CA$59.00
CA$59.00

Baader Coulant - 2"/T-2

BAA-2408150
2 en stock

Adaptateur photo T-2 avec filetage intérieur 2" Corps de nez de 2" côté télescope avec rainure de sécurité, filetage externe T-2 côté mise au po...

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CA$59.00 - CA$59.00
CA$59.00
CA$59.00 - CA$59.00
CA$59.00
CA$28.00 - CA$28.00
CA$28.00
CA$28.00 - CA$28.00
CA$28.00

Baader Rallonge de Coulant - 1.25"

BAA-1905130
1 en stock

Il y a souvent un problème avec les systèmes hors axe ou les accessoires de miroir rabattables, où les réceptacles des oculaires normaux sont jus...

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CA$28.00 - CA$28.00
CA$28.00
CA$28.00 - CA$28.00
CA$28.00
CA$63.00 - CA$63.00
CA$63.00
CA$63.00 - CA$63.00
CA$63.00

Baader Coulant avec Entailles de Sureté - 2"

BAA-2408156
1 en stock

Embout nasal ultra dur de 2 ", avec les entailles de sécurité exclusives de Baader (introduites avec nos oculaires Morpheus et Hyperion Zoom Mar...

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CA$63.00 - CA$63.00
CA$63.00
CA$63.00 - CA$63.00
CA$63.00
CA$117.00 - CA$117.00
CA$117.00
CA$117.00 - CA$117.00
CA$117.00

Baader Adaptateur Pentax M84/M68 (Zeiss)

BAA-2458240

Pour s'adapter à la pince ultracourte 2" #2458196 sur Pentax OTA Adaptateur Pentax M84 / M68 Côté télescope avec filetage Carl Zeiss M68 Pentax...

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CA$117.00 - CA$117.00
CA$117.00
CA$117.00 - CA$117.00
CA$117.00
Baader Planetarium 1.25" Nosepiece to T-2a – with Safety-Kerf
CA$46.00 - CA$46.00
CA$46.00
CA$46.00 - CA$46.00
CA$46.00

Baader Planetarium 1.25" Nosepiece to T-2a – with Safety-Kerf

BAA-2458106
1 en stock

Connects T-2 accessories to a 1.25" focuser or visual back Modern 3mm T-2 thread depth for cameras with short optical height Safety-Kerf groove pr...

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CA$46.00 - CA$46.00
CA$46.00
CA$46.00 - CA$46.00
CA$46.00
Baader Planetarium 2" Deluxe Eyepiece Clamp for SC-telescopes – with 2" filter thread
CA$107.00 - CA$107.00
CA$107.00
CA$107.00 - CA$107.00
CA$107.00

Baader Planetarium 2" Deluxe Eyepiece Clamp for SC-telescopes – with 2" filter thread

BAA-2958144

Adapts Schmidt-Cassegrain telescopes to use 2-inch accessories Internal 2-inch filter thread for optical tube protection Securely holds heavy diag...

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CA$107.00 - CA$107.00
CA$107.00
CA$107.00 - CA$107.00
CA$107.00
Baader Planetarium 2" Deluxe Eyepiece Clamp for SC-telescopes – with 2" Nosepiece
CA$108.00 - CA$108.00
CA$108.00
CA$108.00 - CA$108.00
CA$108.00

Baader Planetarium 2" Deluxe Eyepiece Clamp for SC-telescopes – with 2" Nosepiece

BAA-2958145

Adds 60mm of optical length to the light path Securely clamps 2-inch eyepieces and accessories Integrated dual 2-inch filter holder Connects to st...

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CA$108.00 - CA$108.00
CA$108.00
CA$108.00 - CA$108.00
CA$108.00
Baader Planetarium 2" Nosepiece to M45a – for Hyperion® Zoom MK III
CA$70.00 - CA$70.00
CA$70.00
CA$70.00 - CA$70.00
CA$70.00

Baader Planetarium 2" Nosepiece to M45a – for Hyperion® Zoom MK III

BAA-2454824C

Converts the Hyperion® Zoom MK III eyepiece to a native 2" barrel Threads directly to the eyepiece's M45a body thread Eliminates the need for a se...

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CA$70.00 - CA$70.00
CA$70.00
CA$70.00 - CA$70.00
CA$70.00
Baader Planetarium 2" Nosepiece to M54a – with Safety-Kerf
CA$56.00 - CA$56.00
CA$56.00
CA$56.00 - CA$56.00
CA$56.00

Baader Planetarium 2" Nosepiece to M54a – with Safety-Kerf

BAA-2958770

Connects M54 threaded accessories to any 2" focuser or adapter M54 external (male) thread provides a wide, secure connection Features Baader's Saf...

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CA$56.00 - CA$56.00
CA$56.00
CA$56.00 - CA$56.00
CA$56.00
Baader Planetarium Baader 3.5" Quick Changer and Instrument Rotator for PlaneWave
CA$576.00 - CA$576.00
CA$576.00
CA$576.00 - CA$576.00
CA$576.00

Baader Planetarium 3.5" Quick Changer and Instrument Rotator for PlaneWave

BAA-1324000

Enables secure, rotation-proof mounting of heavy accessories Designed for the 3.5" Hedrick Focuser on PlaneWave CDK 14" to 24" telescopes Allows f...

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CA$576.00 - CA$576.00
CA$576.00
CA$576.00 - CA$576.00
CA$576.00
Baader Planetarium Baader 3.5" Quick Changer Ring
CA$401.00 - CA$401.00
CA$401.00
CA$401.00 - CA$401.00
CA$401.00

Baader Planetarium 3.5" Quick Changer Ring

BAA-1324005

Enables rapid exchange of heavy instrument packages Designed for the 3.5" Hedrick Focuser Compatible with PlaneWave CDK 14" to 24" telescopes Allo...

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CA$401.00 - CA$401.00
CA$401.00
CA$401.00 - CA$401.00
CA$401.00
Baader Planetarium Adapter 1"a C-Mount to T-2i – incl. UV/IR Cut Filter
CA$113.00 - CA$113.00
CA$113.00
CA$113.00 - CA$113.00
CA$113.00

Baader Planetarium Adapter 1"a C-Mount to T-2i – incl. UV/IR Cut Filter

BAA-2958520I

Adapts C-Mount (1" x 32 TPI) threads to the T-2 (M42x0.75) system Integrates a factory-mounted UV/IR Cut Filter Provides a critical link for guide...

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CA$113.00 - CA$113.00
CA$113.00
CA$113.00 - CA$113.00
CA$113.00
Baader Planetarium Adapter 3"i to M68a – for FLI / SBIG
CA$194.00 - CA$194.00
CA$194.00
CA$194.00 - CA$194.00
CA$194.00

Baader Planetarium Adapter 3"i to M68a – for FLI / SBIG

BAA-2458218

Connects devices with a 3" internal thread to an M68 external thread Designed specifically for FLI filter wheels and SBIG STX series cameras Enabl...

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CA$194.00 - CA$194.00
CA$194.00
CA$194.00 - CA$194.00
CA$194.00

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.