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Adapters

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.

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Tele Vue Canon Wide T Adapter w-Bayonet for 2.4" 1
CA$97.00 - CA$97.00
CA$97.00
CA$97.00 - CA$97.00
CA$97.00

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:...

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CA$97.00 - CA$97.00
CA$97.00
CA$97.00 - CA$97.00
CA$97.00
Tele Vue Equalizer HiHat Adapter - 2" - 1.25" 1
CA$123.00 - CA$123.00
CA$123.00
CA$123.00 - CA$123.00
CA$123.00

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...

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CA$123.00 - CA$123.00
CA$123.00
CA$123.00 - CA$123.00
CA$123.00
Tele Vue Flat top Adapter - 2" - 1.25" 1
CA$87.00 - CA$87.00
CA$87.00
CA$87.00 - CA$87.00
CA$87.00

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...

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CA$87.00 - CA$87.00
CA$87.00
CA$87.00 - CA$87.00
CA$87.00
Tele Vue Imaging System Nosepiece for Focuser - 2" 1
CA$97.00 - CA$97.00
CA$97.00
CA$97.00 - CA$97.00
CA$97.00

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...

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CA$97.00 - CA$97.00
CA$97.00
CA$97.00 - CA$97.00
CA$97.00
Tele Vue In-Travel Adapter - 2" - 1.25" 2
Tele Vue In-Travel Adapter - 2" - 1.25" 1
CA$87.00 - CA$87.00
CA$87.00
CA$87.00 - CA$87.00
CA$87.00

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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CA$87.00 - CA$87.00
CA$87.00
CA$87.00 - CA$87.00
CA$87.00
Tele Vue M54 Camera Adapter for 2.4" 2
Tele Vue M54 Camera Adapter for 2.4" 1
CA$55.00 - CA$55.00
CA$55.00
CA$55.00 - CA$55.00
CA$55.00

Tele Vue M54 Camera Adapter for 2.4"

TV-M54-1073

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

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CA$55.00 - CA$55.00
CA$55.00
CA$55.00 - CA$55.00
CA$55.00
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
CA$97.00 - CA$97.00
CA$97.00
CA$97.00 - CA$97.00
CA$97.00

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...

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CA$97.00 - CA$97.00
CA$97.00
CA$97.00 - CA$97.00
CA$97.00
Tele Vue PMT-2200 T-Ring Adapter 1
CA$97.00 - CA$97.00
CA$97.00
CA$97.00 - CA$97.00
CA$97.00

Tele Vue PMT-2200 T-Ring Adapter

TV-PTR-2200
1 in 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...

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CA$97.00 - CA$97.00
CA$97.00
CA$97.00 - CA$97.00
CA$97.00
Tele Vue PMT-4201 T-Ring Adapter 1
CA$97.00 - CA$97.00
CA$97.00
CA$97.00 - CA$97.00
CA$97.00

Tele Vue PMT-4201 T-Ring Adapter

TV-PTR-4201

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

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CA$97.00 - CA$97.00
CA$97.00
CA$97.00 - CA$97.00
CA$97.00
CA$139.00 - CA$139.00
CA$139.00
CA$139.00 - CA$139.00
CA$139.00

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 ...

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CA$139.00 - CA$139.00
CA$139.00
CA$139.00 - CA$139.00
CA$139.00
Tele Vue SBIG STL Camera Adapter for 2.4" 2
Tele Vue SBIG STL Camera Adapter for 2.4" 1
CA$55.00 - CA$55.00
CA$55.00
CA$55.00 - CA$55.00
CA$55.00

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 ...

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CA$55.00 - CA$55.00
CA$55.00
CA$55.00 - CA$55.00
CA$55.00
Tele Vue SCT Adapter 2
Tele Vue SCT Adapter 1
CA$97.00 - CA$97.00
CA$97.00
CA$97.00 - CA$97.00
CA$97.00

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...

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CA$97.00 - CA$97.00
CA$97.00
CA$97.00 - CA$97.00
CA$97.00
Tele Vue Set of 2 (TLF+ TLG) 2.4" Accessory Tubes 1
CA$39.00 - CA$39.00
CA$39.00
CA$39.00 - CA$39.00
CA$39.00

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...

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CA$39.00 - CA$39.00
CA$39.00
CA$39.00 - CA$39.00
CA$39.00
Tele Vue Set of 6 2.4" Accessory Tubes 2
Tele Vue Set of 6 2.4" Accessory Tubes 1
CA$218.00 - CA$218.00
CA$218.00
CA$218.00 - CA$218.00
CA$218.00

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...

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CA$218.00 - CA$218.00
CA$218.00
CA$218.00 - CA$218.00
CA$218.00
Tele Vue Standard T-Ring Adapter for 2.4" 2
Tele Vue Standard T-Ring Adapter for 2.4" 1
CA$55.00 - CA$55.00
CA$55.00
CA$55.00 - CA$55.00
CA$55.00

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: 0.35" (8.9mm) Material...

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CA$55.00 - CA$55.00
CA$55.00
CA$55.00 - CA$55.00
CA$55.00
Tele Vue Camera Adapter - 2" 1
CA$97.00 - CA$97.00
CA$97.00
CA$97.00 - CA$97.00
CA$97.00

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...

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CA$97.00 - CA$97.00
CA$97.00
CA$97.00 - CA$97.00
CA$97.00
CA$56.00 - CA$56.00
CA$56.00
CA$56.00 - CA$56.00
CA$56.00

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

TS-M48-EOSs

This adaptor screws directly into the Canon EOS body and enables you to connect objectives and adapters with M48 (M48x0,75) 2" filterthread.The EOS...

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CA$56.00 - CA$56.00
CA$56.00
CA$56.00 - CA$56.00
CA$56.00
Wanderer Astro M42 female to M54 male adapter (4mm thread, 0mm extension)
CA$27.00 - CA$27.00
CA$27.00
CA$27.00 - CA$27.00
CA$27.00

Wanderer Astro M42 Female to M54 Male Adapter

WA-M42F-M54M

Connects M42 x 0.75 female threads to M54 x 0.75 male threads Adds 0mm to the optical path length Ideal for maintaining critical back focus distan...

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CA$27.00 - CA$27.00
CA$27.00
CA$27.00 - CA$27.00
CA$27.00
Wanderer Astro Camera Side M54 Female Adapter for Wanderer Electronic Tilt Adjuster M54
CA$55.00 - CA$55.00
CA$55.00
CA$55.00 - CA$55.00
CA$55.00

Wanderer Astro M54 Female Adapter for ETA M54

WA-WETA54-M54F

Provides a native M54 female threaded connection Designed specifically for the Wanderer Electronic Tilt Adjuster (ETA) M54 Ensures a secure, rigid...

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CA$55.00 - CA$55.00
CA$55.00
CA$55.00 - CA$55.00
CA$55.00
Wanderer Astro M54 Male to Male Adapter
CA$25.00 - CA$25.00
CA$25.00
CA$25.00 - CA$25.00
CA$25.00

Wanderer Astro M54 Male to Male Adapter

WA-M54-MM

Connects two accessories with M54x0.75 female threads Low-profile design adds minimal length to the optical path Preserves critical backfocus for ...

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CA$25.00 - CA$25.00
CA$25.00
CA$25.00 - CA$25.00
CA$25.00
Wanderer Astro M54 Male to Male Adapter - 1.2mm Extension
CA$41.00 - CA$41.00
CA$41.00
CA$41.00 - CA$41.00
CA$41.00

Wanderer Astro M54 Male to Male Adapter

WA-M54-MM2

Connects two female M54 threaded components Provides a precise 1.2mm extension Ideal for Takahashi E-130, E-160, and E-180 astrographs Machined fr...

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CA$41.00 - CA$41.00
CA$41.00
CA$41.00 - CA$41.00
CA$41.00
Wanderer Astro M68 Male to Male Adapter
CA$39.00 - CA$39.00
CA$39.00
CA$39.00 - CA$39.00
CA$39.00

Wanderer Astro M68 Male to Male Adapter

WA-M68-MM

Connects two female M68x1 threaded accessories Ultra-thin profile minimizes backfocus consumption Precision-machined for a rigid, no-flex connecti...

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CA$39.00 - CA$39.00
CA$39.00
CA$39.00 - CA$39.00
CA$39.00
Wanderer Astro SharpStar RC2508 Reducer Adapter Kits for WandererRotator Lite
CA$139.00 - CA$139.00
CA$139.00
CA$139.00 - CA$139.00
CA$139.00

Wanderer Astro SharpStar RC2508 Reducer Adapter Kits for WandererRotator Lite

WA-RC2508A

Connects SharpStar RC2508 Reducer to WandererRotator Lite Enables precise, automated image framing Provides a secure, rigid, all-threaded connecti...

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CA$139.00 - CA$139.00
CA$139.00
CA$139.00 - CA$139.00
CA$139.00
Wanderer Astro Takahashi FSQ106 645 0.72X Reducer Adapter for WandererRotator Pro
CA$171.00 - CA$171.00
CA$171.00
CA$171.00 - CA$171.00
CA$171.00

Wanderer Astro Takahashi FSQ106 645 0.72X Reducer Adapter for WandererRotator Pro

WA-FSQ106645A

Connects the Takahashi 645 QE 0.72x Reducer to the WandererRotator Pro Engineered for the FSQ-106 optical system Provides a rigid, non-flexing thr...

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CA$171.00 - CA$171.00
CA$171.00
CA$171.00 - CA$171.00
CA$171.00

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.