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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

Tele Vue 2.4" Accessory Tube - 0.25" (6.4mm) 2
Tele Vue 2.4" Accessory Tube - 0.25" (6.4mm) 1
$39.00 - $39.00
$39.00
$39.00 - $39.00
$39.00

Tele Vue 2.4" Accessory Tube - 0.25" (6.4mm)

TV-TLA-0250

Component Type: Fixed Extension Tube System Format: Tele Vue 2.4" Imaging System Optical Length: 0.25" (6.4mm) Connection Side 1: M61x1 Male Threa...

Afficher tous les détails
$39.00 - $39.00
$39.00
$39.00 - $39.00
$39.00
Tele Vue 2.4" Accessory Tube - 0.375" (9.5mm) 2
Tele Vue 2.4" Accessory Tube - 0.375" (9.5mm) 1
$39.00 - $39.00
$39.00
$39.00 - $39.00
$39.00

Tele Vue 2.4" Accessory Tube - 0.375" (9.5mm)

TV-TLB-0375

Extension Length: 9.5mm (0.375") Format: Tele Vue 2.4" Accessory Standard Connection Side 1: 2.4" Female Thread Connection Side 2: 2.4" Male Threa...

Afficher tous les détails
$39.00 - $39.00
$39.00
$39.00 - $39.00
$39.00
Tele Vue 2.4" Accessory Tube - 0.50" (12.7mm) 2
Tele Vue 2.4" Accessory Tube - 0.50" (12.7mm) 1
$39.00 - $39.00
$39.00
$39.00 - $39.00
$39.00

Tele Vue 2.4" Accessory Tube - 0.50" (12.7mm)

TV-TLC-0500

Extension Length: 0.50" (12.7mm) Connection Standard: Tele Vue 2.4" Imaging System Thread Material: Black Anodized Aluminum Clear Aperture: >2....

Afficher tous les détails
$39.00 - $39.00
$39.00
$39.00 - $39.00
$39.00
Tele Vue 2.4" Accessory Tube - 1.0 (25.4mm) 2
Tele Vue 2.4" Accessory Tube - 1.0 (25.4mm) 1
$39.00 - $39.00
$39.00
$39.00 - $39.00
$39.00

Tele Vue 2.4" Accessory Tube - 1.0 (25.4mm)

TV-TLD-1000

Extension Length: 1.0" (25.4mm) Format: Tele Vue 2.4" Imaging System Connection Side 1: 2.4" Male Thread Connection Side 2: 2.4" Female Thread Mat...

Afficher tous les détails
$39.00 - $39.00
$39.00
$39.00 - $39.00
$39.00
Tele Vue 48-mm Filter Adapter for 2.4" 2
Tele Vue 48-mm Filter Adapter for 2.4" 1
$39.00 - $39.00
$39.00
$39.00 - $39.00
$39.00

Tele Vue 48mm Filter Adapter for 2.4"

TV-AFT-1105

Connection (Telescope Side): Tele Vue 2.4" Female Thread Connection (Filter Side): M48x0.75 Male Thread (Standard 2" Filter Thread) Application: T...

Afficher tous les détails
$39.00 - $39.00
$39.00
$39.00 - $39.00
$39.00
Tele Vue Canon Wide T Adapter w-Bayonet for 2.4" 1
$69.00 - $69.00
$69.00
$69.00 - $69.00
$69.00

Tele Vue Canon Wide T Adapter w-Bayonet for 2.4"

TV-CWT-2070

Connections: Canon EOS Bayonet (Camera Side) / Tele Vue 2.4" Thread (Telescope Side) Clear Aperture: 25% larger than standard T-rings Application:...

Afficher tous les détails
$69.00 - $69.00
$69.00
$69.00 - $69.00
$69.00
Tele Vue Equalizer HiHat Adapter - 2" - 1.25" 1
$88.00 - $88.00
$88.00
$88.00 - $88.00
$88.00

Tele Vue Equalizer HiHat Adapter - 2" - 1.25"

TV-BEC-0005

Function: Balances telescope when switching between 2" and 1.25" eyepieces Compatibility: 2" focusers and diagonals Eyepiece Size: Accepts 1.25" e...

Afficher tous les détails
$88.00 - $88.00
$88.00
$88.00 - $88.00
$88.00
Tele Vue Flat top Adapter - 2" - 1.25" 1
$62.00 - $62.00
$62.00
$62.00 - $62.00
$62.00

Tele Vue Flat top Adapter - 2" - 1.25"

TV-ACF-2125

Adapter Type: 2" to 1.25" Reducer Profile: Flat Top (Low Profile) Locking Mechanism: Brass Clamp Ring Compatibility: 2" Focusers and Diagonals Eye...

Afficher tous les détails
$62.00 - $62.00
$62.00
$62.00 - $62.00
$62.00
Tele Vue Flip-Mirror only (to upgrade older models) 1
$34.00 - $34.00
$34.00
$34.00 - $34.00
$34.00

Tele Vue Flip-Mirror only (to upgrade older models)

TV-SFM-1005

Mechanism: Kinematic, locking flip-mirror Primary Port: Straight-through optical path Secondary Port: 90° reflected path with helical focuser Focu...

Afficher tous les détails
$34.00 - $34.00
$34.00
$34.00 - $34.00
$34.00
Tele Vue Imaging System Nosepiece for Focuser - 2" 1
$69.00 - $69.00
$69.00
$69.00 - $69.00
$69.00

Tele Vue Imaging System Nosepiece for Focuser - 2"

TV-RAD-1074

Connection to Telescope: 2" Barrel Connection to Camera Side: Tele Vue Imaging System Thread Filter Compatibility: Standard 2" (48mm) Filter Threa...

Afficher tous les détails
$69.00 - $69.00
$69.00
$69.00 - $69.00
$69.00
Tele Vue In-Travel Adapter - 2" - 1.25" 2
Tele Vue In-Travel Adapter - 2" - 1.25" 1
$62.00 - $62.00
$62.00
$62.00 - $62.00
$62.00

Tele Vue In-Travel Adapter - 2" - 1.25"

TV-AIT-2125

Function: Reduces focuser in-travel requirements Compatibility: 2" focusers and diagonals Accessory Size: 1.25" eyepieces and accessories Locking ...

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$62.00 - $62.00
$62.00
$62.00 - $62.00
$62.00
Tele Vue M54 Camera Adapter for 2.4" 2
Tele Vue M54 Camera Adapter for 2.4" 1
$39.00 - $39.00
$39.00
$39.00 - $39.00
$39.00

Tele Vue M54 Camera Adapter for 2.4"

TV-M54-1073

Telescope Connection: Tele Vue 2.4" Imaging System Thread Camera Connection: M54x0.75 Male Thread Material: Black Anodized Aluminum Compatibility:...

Afficher tous les détails
$39.00 - $39.00
$39.00
$39.00 - $39.00
$39.00
Tele Vue Nikon F Wide T Adapter w-Bayonet for 2.4" 2
Tele Vue Nikon F Wide T Adapter w-Bayonet for 2.4" 1
$69.00 - $69.00
$69.00
$69.00 - $69.00
$69.00

Tele Vue Nikon F Wide T Adapter w-Bayonet for 2.4"

TV-NWT-2073

Connection to Telescope: Tele Vue 2.4" Imaging System Thread Connection to Camera: Nikon F-mount Bayonet Clear Aperture: >42mm (Wider than stan...

Afficher tous les détails
$69.00 - $69.00
$69.00
$69.00 - $69.00
$69.00
Tele Vue PMT-2200 T-Ring Adapter 1
$69.00 - $69.00
$69.00
$69.00 - $69.00
$69.00

Tele Vue PMT-2200 T-Ring Adapter

TV-PTR-2200
1 en stock

Connects DSLR/Mirrorless Cameras to 2" 2x Powermate Standard Male T-Ring Thread (M42x0.75) Attaches Directly to Powermate Top Lens Cell Low-Profil...

Afficher tous les détails
$69.00 - $69.00
$69.00
$69.00 - $69.00
$69.00
Tele Vue PMT-4201 T-Ring Adapter 1
$69.00 - $69.00
$69.00
$69.00 - $69.00
$69.00

Tele Vue PMT-4201 T-Ring Adapter

TV-PTR-4201

Product Code: PTR-4201 Connection Side 1: 4x Powermate (PMT-4201) Female Thread Connection Side 2: M42x0.75 T-Ring Male Thread Material: Anodized ...

Afficher tous les détails
$69.00 - $69.00
$69.00
$69.00 - $69.00
$69.00
$99.00 - $99.00
$99.00
$99.00 - $99.00
$99.00

Tele Vue Questar Adapter - 1.25"

TV-AQE-0005

Adapts Questar telescopes to accept 1.25" eyepieces Connection to Telescope: Questar Male Thread Connection to Accessory: 1.25" Barrel with Brass ...

Afficher tous les détails
$99.00 - $99.00
$99.00
$99.00 - $99.00
$99.00
Tele Vue Satin HiHat Adapter- 2" - 1.25" 1
$78.00 - $78.00
$78.00
$78.00 - $78.00
$78.00

Tele Vue Satin HiHat Adapter- 2" - 1.25"

TV-ASF-8125

$78.00 - $78.00
$78.00
$78.00 - $78.00
$78.00
Tele Vue SBIG STL Camera Adapter for 2.4" 2
Tele Vue SBIG STL Camera Adapter for 2.4" 1
$39.00 - $39.00
$39.00
$39.00 - $39.00
$39.00

Tele Vue SBIG STL Camera Adapter for 2.4"

TV-STL-1071

Connection Side 1: Tele Vue 2.4" Imaging System Thread Connection Side 2: SBIG STL-Series Camera Thread Material: Black Anodized Aluminum Optical ...

Afficher tous les détails
$39.00 - $39.00
$39.00
$39.00 - $39.00
$39.00
Tele Vue SCT Adapter 2
Tele Vue SCT Adapter 1
$69.00 - $69.00
$69.00
$69.00 - $69.00
$69.00

Tele Vue SCT Adapter - 2"

TV-ACC-0003

Attaches to standard 2-inch Schmidt-Cassegrain rear cell threads (2"-24 TPI) Accepts standard 2-inch diagonals, eyepieces, and accessories Non-mar...

Afficher tous les détails
$69.00 - $69.00
$69.00
$69.00 - $69.00
$69.00
Tele Vue Set of 2 (TLF+ TLG) 2.4" Accessory Tubes 1
$28.00 - $28.00
$28.00
$28.00 - $28.00
$28.00

Tele Vue Set of 2x (TLF+ TLG) 2.4" Accessory Tubes

TV-TLS-1121

Extension Provided: 1mm (TLF-0040) Extension Provided: 2mm (TLG-0080) System Compatibility: Tele Vue 2.4" Imaging System Connection Type: 2.4" Thr...

Afficher tous les détails
$28.00 - $28.00
$28.00
$28.00 - $28.00
$28.00
Tele Vue Set of 6 2.4" Accessory Tubes 2
Tele Vue Set of 6 2.4" Accessory Tubes 1
$156.00 - $156.00
$156.00
$156.00 - $156.00
$156.00

Tele Vue Set of 6x 2.4" Accessory Tubes

TV-TLS-2245

Achieve Precise Back Focus for Tele Vue Imaging Systems Includes Four Threaded Extension Tubes (6.4mm, 9.5mm, 12.7mm, 25.4mm) Includes Two Unthrea...

Afficher tous les détails
$156.00 - $156.00
$156.00
$156.00 - $156.00
$156.00
Tele Vue Standard T-Ring Adapter for 2.4" 2
Tele Vue Standard T-Ring Adapter for 2.4" 1
$39.00 - $39.00
$39.00
$39.00 - $39.00
$39.00

Tele Vue Standard T-Ring Adapter for 2.4"

TV-TRG-1072

Connection (Telescope Side): Tele Vue 2.4" Female Thread Connection (Camera Side): Male T-Thread (M42x0.75) Optical Length: 0.26" (6.6mm) Material...

Afficher tous les détails
$39.00 - $39.00
$39.00
$39.00 - $39.00
$39.00
Tele Vue Camera Adapter - 2" 1
$69.00 - $69.00
$69.00
$69.00 - $69.00
$69.00

Tele Vue T2 Camera Adapter - 2"

TV-ACM-2000

Connection Type: Prime Focus Astrophotography Telescope Side Connection: 2" Barrel Camera Side Connection: Male T-Threads (M42x0.75) Material: Ano...

Afficher tous les détails
$69.00 - $69.00
$69.00
$69.00 - $69.00
$69.00
$40.00 - $40.00
$40.00
$40.00 - $40.00
$40.00

TS-Optics UltraShort EOS T-Ring - M48x0.75

TS-M48-EOSs

Cet adaptateur se visse directement dans le corps du Canon EOS et vous permet de connecter des objectifs et des adaptateurs avec un filetage de fi...

Afficher tous les détails
$40.00 - $40.00
$40.00
$40.00 - $40.00
$40.00

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.