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

Baader Conversion Ring Zeiss to Hex Focusers - M68x0.75(F)/M68x1(F)

BAA-2458236

Adapts M68x0.75 male threads to accept M68x1 male accessories Internal Thread 1: M68x1 (Zeiss Standard) Internal Thread 2: M68x0.75 Designed for f...

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CA$66.00 - CA$66.00
CA$66.00
CA$66.00 - CA$66.00
CA$66.00
CA$85.00 - CA$85.00
CA$85.00
CA$85.00 - CA$85.00
CA$85.00

Baader Deluxe Clamping Eyepiece Holder - 2"

BAA-2408140

Securely holds all 2" eyepieces and accessories Non-marring clamping mechanism prevents scratches on barrels Ensures precise and repeatable center...

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CA$85.00 - CA$85.00
CA$85.00
CA$85.00 - CA$85.00
CA$85.00
CA$89.00 - CA$89.00
CA$89.00
CA$89.00 - CA$89.00
CA$89.00

Baader Diascope Bayonet Eyepiece Adapter - 1.25"

BAA-2454500

Adapts Zeiss Diascope Bayonet to a standard 1.25" eyepiece holder Unlocks access to the entire 1.25" astronomical eyepiece market Enables use of s...

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CA$89.00 - CA$89.00
CA$89.00
CA$89.00 - CA$89.00
CA$89.00
CA$107.00 - CA$107.00
CA$107.00
CA$107.00 - CA$107.00
CA$107.00

Baader Diascope Bayonet Eyepiece Adapter - 2"

BAA-2454502

Adapts Zeiss Diascope eyepieces to a standard 2" focuser Features the proprietary Zeiss bayonet mount Precision-machined for a secure, non-marring...

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CA$107.00 - CA$107.00
CA$107.00
CA$107.00 - CA$107.00
CA$107.00
CA$49.00 - CA$49.00
CA$49.00
CA$49.00 - CA$49.00
CA$49.00

Baader Double T-Filterholder - 1.25"

BAA-1508030

Holds two standard 1.25" filters Enables rapid switching between filters T-2 (M42x0.75) threads on both sides Minimal back focus consumption Ideal...

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CA$49.00 - CA$49.00
CA$49.00
CA$49.00 - CA$49.00
CA$49.00
CA$40.00 - CA$40.00
CA$40.00
CA$40.00 - CA$40.00
CA$40.00

Baader DSLR-2" Filter Holder - M48/SP54

BAA-2408166

Adapts 2" astronomical filters with M48 threads for use on standard DSLR camera lenses Provides a standard SP54 female thread for connection to va...

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CA$40.00 - CA$40.00
CA$40.00
CA$40.00 - CA$40.00
CA$40.00
CA$41.00 - CA$41.00
CA$41.00
CA$41.00 - CA$41.00
CA$41.00

Baader DT Adapter I - T-2/M37

BAA-2408165

T-2i / M37a. T-2 photo adaptor to connect T-rings (m37) to the Baader ADPS system. For many Sony video cameras such . B .: Sony DSC S - 30 / S - 5...

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CA$41.00 - CA$41.00
CA$41.00
CA$41.00 - CA$41.00
CA$41.00
CA$46.00 - CA$46.00
CA$46.00
CA$46.00 - CA$46.00
CA$46.00

Baader DT-Adapter II - T-2/SP54

BAA-2458040

Connects T-2 (M42x0.75) accessories to the Baader SP54 system Adapts to the M54 threads found on Baader Hyperion eyepieces Engineered for the shor...

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CA$46.00 - CA$46.00
CA$46.00
CA$46.00 - CA$46.00
CA$46.00
CA$49.00 - CA$49.00
CA$49.00
CA$49.00 - CA$49.00
CA$49.00

Baader Expanding Ring - 2" NexStar 4 (C90)/ETX

BAA-2958500A

Converts the rear port thread on Celestron C90, NexStar 4, and Meade ETX telescopes Adapts the proprietary thread to a standard 2" Schmidt-Cassegr...

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CA$49.00 - CA$49.00
CA$49.00
CA$49.00 - CA$49.00
CA$49.00
CA$33.00 - CA$33.00
CA$33.00
CA$33.00 - CA$33.00
CA$33.00

Baader Expanding Ring - T-2(F)/M48x0.75(M)

BAA-2458110

Converts female T-2 (M42x0.75) threads to male M48x0.75 threads Functions as a T-2 to 2-inch filter thread adapter Enables connection of T-2 acces...

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CA$33.00 - CA$33.00
CA$33.00
CA$33.00 - CA$33.00
CA$33.00
CA$57.00 - CA$57.00
CA$57.00
CA$57.00 - CA$57.00
CA$57.00

Baader Eyepiece Adapter - 1.25"/M41 Morpheus to Kowa TSN 770/880

BAA-2454520

Adapts Baader Morpheus eyepieces to Kowa spotting scopes Compatible with Kowa TSN 770 and TSN 880 models Utilizes the M41 thread on Morpheus eyepi...

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CA$57.00 - CA$57.00
CA$57.00
CA$57.00 - CA$57.00
CA$57.00
CA$70.00 - CA$70.00
CA$70.00
CA$70.00 - CA$70.00
CA$70.00

Baader Focusing Eyepiece Holder - 1.25"/M36.4(M)

BAA-2408195

Adds precise focusing to 1.25" eyepieces or accessories Connects to female M36.4 Vixen-style threads Ideal for finderscopes, guidescopes, and othe...

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CA$70.00 - CA$70.00
CA$70.00
CA$70.00 - CA$70.00
CA$70.00
CA$67.00 - CA$67.00
CA$67.00
CA$67.00 - CA$67.00
CA$67.00

Baader Focusing Eyepiece Holder - 1.25"/T-2

BAA-2458125
3 in stock

Adds precise helical focusing to any T-2 thread Accepts standard 1.25" eyepieces and accessories Dual clampscrews for a balanced, secure hold Inte...

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CA$67.00 - CA$67.00
CA$67.00
CA$67.00 - CA$67.00
CA$67.00
CA$148.00 - CA$148.00
CA$148.00
CA$148.00 - CA$148.00
CA$148.00

Baader Four-In-One adapter M68 (Zeiss)/2.7" (A.P.)/M60 (Vixen)/M56 (Synta)/T-2

BAA-2458225

Adapts M68 (Zeiss) accessories to multiple telescope focuser threads Provides native connection for 2.7" (Astro-Physics) focusers Provides native ...

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CA$148.00 - CA$148.00
CA$148.00
CA$148.00 - CA$148.00
CA$148.00
CA$162.00 - CA$162.00
CA$162.00
CA$162.00 - CA$162.00
CA$162.00

Baader Heavy Duty Complete T-2 Changer System

BAA-2456322
2 in stock

Heavy-duty quick changer for heavy cameras and accessories Features a Zeiss-style pressure block for secure, non-marring clamping Provides 360° ro...

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CA$162.00 - CA$162.00
CA$162.00
CA$162.00 - CA$162.00
CA$162.00
CA$117.00 - CA$117.00
CA$117.00
CA$117.00 - CA$117.00
CA$117.00

Baader Heavy Duty T-2 Quick Changer

BAA-2456313A

Enables rapid connection and disconnection of T-2 accessories Heavy-duty design supports heavier cameras and filter wheels Eliminates the risk of ...

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CA$117.00 - CA$117.00
CA$117.00
CA$117.00 - CA$117.00
CA$117.00
CA$30.00 - CA$30.00
CA$30.00
CA$30.00 - CA$30.00
CA$30.00

Baader Hyperion / Morpheus Extension - M43

BAA-2954250

Customizes eyecup height for optimal eye placement Provides a secure clamping surface for smartphone adapters Stackable design for eyepiece projec...

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CA$30.00 - CA$30.00
CA$30.00
CA$30.00 - CA$30.00
CA$30.00
CA$35.00 - CA$35.00
CA$35.00
CA$35.00 - CA$35.00
CA$35.00

Baader Hyperion 2" Finetuning Stopring w/Brass Clampring

BAA-2958027
3 in stock

Makes 2-inch Baader Hyperion eyepieces parfocal Sets a precise, repeatable focus position for each eyepiece Integrated brass clamp ring prevents s...

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CA$35.00 - CA$35.00
CA$35.00
CA$35.00 - CA$35.00
CA$35.00
CA$33.00 - CA$33.00
CA$33.00
CA$33.00 - CA$33.00
CA$33.00

Baader Hyperion DT-Ring - M62/M67

BAA-2958067

Adapts M62 Female Threads to M67 Male Threads Enables Afocal Photography with Hyperion Eyepieces Connects Camera Lenses or Filters with M67 Thread...

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CA$33.00 - CA$33.00
CA$33.00
CA$33.00 - CA$33.00
CA$33.00
CA$33.00 - CA$33.00
CA$33.00
CA$33.00 - CA$33.00
CA$33.00

Baader Hyperion DT-Ring - M62/M72

BAA-2958072

Adapts M62 Female Threads to M72 Male Threads Engineered for the Baader Hyperion Digital T-Adapter (HDT54/62) Provides a Secure, Rigid Connection ...

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CA$33.00 - CA$33.00
CA$33.00
CA$33.00 - CA$33.00
CA$33.00
CA$33.00 - CA$33.00
CA$33.00
CA$33.00 - CA$33.00
CA$33.00

Baader Hyperion DT-Ring - M62/M77

BAA-2958077

Adapts M62 Female Threads to M77 Male Threads Designed for Baader Hyperion Eyepieces Enables Afocal Photography with Camera Lenses Required Compon...

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CA$33.00 - CA$33.00
CA$33.00
CA$33.00 - CA$33.00
CA$33.00
CA$33.00 - CA$33.00
CA$33.00
CA$33.00 - CA$33.00
CA$33.00

Baader Hyperion DT-Ring - M72/M82

BAA-2958082

Connects M72 Female Threads to M82 Male Threads Essential Component of the Baader Hyperion Digital T-Ring System Precision Machined for a Secure, ...

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CA$33.00 - CA$33.00
CA$33.00
CA$33.00 - CA$33.00
CA$33.00
CA$28.00 - CA$28.00
CA$28.00
CA$28.00 - CA$28.00
CA$28.00

Baader Hyperion DT-Ring - SP54/M28

BAA-2958028

Connects Baader SP54 threads to camera-side M28 threads Engineered for the shortest possible connection distance Minimizes vignetting in afocal ca...

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

Baader Hyperion DT-Ring - SP54/M37

BAA-2958037

Connects SP54 eyepiece threads to M37 camera filter threads Engineered for the shortest possible distance in afocal photography Designed specifica...

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

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.