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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$152.00 - CA$152.00
CA$152.00
CA$152.00 - CA$152.00
CA$152.00

Baader UFC S70 Extension - VariLock 15-20mm

BAA-2459145

Adjustable Extension Range: 15mm to 20mm Locking Mechanism: VariLock for secure, no-slip positioning Telescope-Side Interface: S70 Dovetail Recept...

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CA$152.00 - CA$152.00
CA$152.00
CA$152.00 - CA$152.00
CA$152.00
CA$49.00 - CA$49.00
CA$49.00
CA$49.00 - CA$49.00
CA$49.00

Baader UFC Straylight Shield

BAA-2459121

Blocks stray light when using the Baader UFC filter system with camera lenses Prevents internal reflections and gradients on long exposures Ensure...

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CA$49.00 - CA$49.00
CA$49.00
CA$49.00 - CA$49.00
CA$49.00
CA$37.00 - CA$37.00
CA$37.00
CA$37.00 - CA$37.00
CA$37.00

Baader UFC Telescope Side Adapter - S70/2"(F) SCT Thread

BAA-2459128

Adapts Baader S70 dovetail to a female 2" SCT thread Connects the UFC base to SCT telescopes and accessories with male 2" SCT threads Part of the ...

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CA$37.00 - CA$37.00
CA$37.00
CA$37.00 - CA$37.00
CA$37.00
CA$130.00 - CA$130.00
CA$130.00
CA$130.00 - CA$130.00
CA$130.00

Baader UFC Telescope Side Adapter - S70/C14 Hyperstar, SCT & HD

BAA-2459133

Connects Baader UFC Base to C14 Hyperstar Lens Assemblies Enables Precise Backfocus for f/2 Imaging Systems Designed for Celestron 14" SCT and Edg...

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CA$130.00 - CA$130.00
CA$130.00
CA$130.00 - CA$130.00
CA$130.00
CA$107.00 - CA$107.00
CA$107.00
CA$107.00 - CA$107.00
CA$107.00

Baader UFC Telescope Side Adapter - S70/C8 Hyperstar & SCT & HD

BAA-2459131

Connects Baader UFC to Celestron 8" SCT/EdgeHD & Hyperstar Provides a rigid, non-flexing threaded connection Features the Baader S70 dovetail ...

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CA$107.00 - CA$107.00
CA$107.00
CA$107.00 - CA$107.00
CA$107.00
CA$114.00 - CA$114.00
CA$114.00
CA$114.00 - CA$114.00
CA$114.00

Baader UFC Telescope Side Adapter - S70/C9.25 or C11 Hyperstar, SCT & HD

BAA-2459132

Connects Baader UFC System to C9.25 & C11 Telescopes Designed for Hyperstar Imaging Systems Compatible with Standard SCT & EdgeHD Models F...

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CA$114.00 - CA$114.00
CA$114.00
CA$114.00 - CA$114.00
CA$114.00
CA$37.00 - CA$37.00
CA$37.00
CA$37.00 - CA$37.00
CA$37.00

Baader UFC Telescope Side Adapter - S70/M48(F)

BAA-2459129

Connects Telescope-Side M48 (2") Accessories to the UFC System Female M48 x 0.75 Internal Thread Features Baader's S70 Dovetail for UFC Base Integ...

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CA$37.00 - CA$37.00
CA$37.00
CA$37.00 - CA$37.00
CA$37.00
CA$37.00 - CA$37.00
CA$37.00
CA$37.00 - CA$37.00
CA$37.00

Baader UFC Telescope Side Adapter - S70/M68(M)

BAA-2459127

Connects Baader UFC Base to M68-threaded accessories Thread Specification: Male M68 x 1 Mount Specification: S70 Dovetail Enables use of large for...

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CA$37.00 - CA$37.00
CA$37.00
CA$37.00 - CA$37.00
CA$37.00
CA$241.00 - CA$241.00
CA$241.00
CA$241.00 - CA$241.00
CA$241.00

Baader UFC Telescope Side Adapter - S70/RASA 11"

BAA-2459126

Connects Baader UFC System to Celestron RASA 11" Astrographs Provides a Telescope-Side S70 Dovetail Interface Ensures a Rigid, Non-Flexing Connect...

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CA$241.00 - CA$241.00
CA$241.00
CA$241.00 - CA$241.00
CA$241.00
CA$369.00 - CA$369.00
CA$369.00
CA$369.00 - CA$369.00
CA$369.00

Baader UFC Telescope Side Adapter - S70/RASA 36

BAA-2459135

Connects Baader UFC Base to Celestron RASA 36 Telescopes Telescope-Side Adapter Features Baader S70 Dovetail Receptor Provides a Secure, Non-Flexi...

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CA$369.00 - CA$369.00
CA$369.00
CA$369.00 - CA$369.00
CA$369.00
CA$124.00 - CA$124.00
CA$124.00
CA$124.00 - CA$124.00
CA$124.00

Baader UFC Telescope Side Adapter - S70/RASA 8"

BAA-2459136
1 in stock

Connects Baader UFC System to the Celestron RASA 8" Provides a rigid, secure S70 telescope-side thread Designed for cameras with minimal back-focu...

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CA$124.00 - CA$124.00
CA$124.00
CA$124.00 - CA$124.00
CA$124.00
CA$44.00 - CA$44.00
CA$44.00
CA$44.00 - CA$44.00
CA$44.00

Baader UFC Telescope Side Adapter - S70/SP54 for Camera Lenses

BAA-2459134

Connects Baader UFC Base to camera lenses Telescope Side Interface: Baader S70 Dovetail Lens Side Interface: Baader SP54 Thread Requires separate ...

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CA$44.00 - CA$44.00
CA$44.00
CA$44.00 - CA$44.00
CA$44.00
CA$37.00 - CA$37.00
CA$37.00
CA$37.00 - CA$37.00
CA$37.00

Baader UFC Telescope Side Adapter - S70/T-2(F)

BAA-2459130

Adapts Baader's Universal Filter Changer (UFC) to a telescope Telescope-Side Connection: Female T-2 (M42x0.75) Thread UFC-Side Connection: Male S7...

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CA$37.00 - CA$37.00
CA$37.00
CA$37.00 - CA$37.00
CA$37.00
CA$75.00 - CA$75.00
CA$75.00
CA$75.00 - CA$75.00
CA$75.00

Baader Ultra Short T-Adapter - 2" SCT(F) Thread/T-2(M)

BAA-2958500B
1 in stock

Adds only 7mm of optical length to your imaging train Connects 2" female SCT threads to male T-2 (M42x0.75) threads Ultra-short design preserves c...

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CA$75.00 - CA$75.00
CA$75.00
CA$75.00 - CA$75.00
CA$75.00
CA$66.00 - CA$66.00
CA$66.00
CA$66.00 - CA$66.00
CA$66.00

Baader Variable Locking Extension - 12-16mm

BAA-2958130
1 in stock

Provides a variable extension range of 12mm to 16mm Features a locking ring to prevent unwanted rotation Standard T-2 (M42x0.75) threads for unive...

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CA$66.00 - CA$66.00
CA$66.00
CA$66.00 - CA$66.00
CA$66.00
CA$60.00 - CA$60.00
CA$60.00
CA$60.00 - CA$60.00
CA$60.00

Baader Variable Locking/Sliding T-2 Focuser

BAA-2458010
1 in stock

Provides variable spacing within the T-2 system Enables fine-focus adjustment for guide cameras and eyepieces Features an integrated locking ring ...

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CA$60.00 - CA$60.00
CA$60.00
CA$60.00 - CA$60.00
CA$60.00
CA$101.00 - CA$101.00
CA$101.00
CA$101.00 - CA$101.00
CA$101.00

Baader VariLock 29 Variable Length Adapter - 20-29mm T-2

BAA-2956929
1 in stock

Variable Length Adjustment: 20-29mm Standard Threads: T-2 (M42x0.75mm) Male & Female Locking Mechanism: Torsion-Resistant Knurled Ring Maximum...

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CA$101.00 - CA$101.00
CA$101.00
CA$101.00 - CA$101.00
CA$101.00
CA$107.00 - CA$107.00
CA$107.00
CA$107.00 - CA$107.00
CA$107.00

Baader VariLock 46 Variable Length Adapter - 29-46mm T-2

BAA-2956946

Variable Length Adjustment: 29mm to 46mm Locking Mechanism: Knurled locking ring with hook wrench engagement Rotational Adjustment: Independent 36...

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CA$107.00 - CA$107.00
CA$107.00
CA$107.00 - CA$107.00
CA$107.00
CA$50.00 - CA$50.00
CA$50.00
CA$50.00 - CA$50.00
CA$50.00

Baader Wide T-Ring Canon EOS - T-2 & S52

BAA-2408332
1 in stock

Connects Canon EOS cameras to telescopes Features a wide S52 dovetail for maximum illumination Includes a removable T-2 (M42x0.75) threaded insert...

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CA$50.00 - CA$50.00
CA$50.00
CA$50.00 - CA$50.00
CA$50.00
CA$50.00 - CA$50.00
CA$50.00
CA$50.00 - CA$50.00
CA$50.00

Baader Wide T-Ring Canon R - T-2 & S52

BAA-2408336
1 in stock

Connects Canon R-mount mirrorless cameras to telescopes Features a removable inner T-2 (M42x0.75) thread adapter Native connection is a wide S52 d...

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CA$50.00 - CA$50.00
CA$50.00
CA$50.00 - CA$50.00
CA$50.00
CA$50.00 - CA$50.00
CA$50.00
CA$50.00 - CA$50.00
CA$50.00

Baader Wide T-Ring Nikon - T-2 & S52

BAA-2408333
1 in stock

Connects Nikon F-mount cameras to telescopes Features both a standard T-2 (M42) thread and a larger S52 dovetail Wider S52 aperture significantly ...

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CA$50.00 - CA$50.00
CA$50.00
CA$50.00 - CA$50.00
CA$50.00
CA$50.00 - CA$50.00
CA$50.00
CA$50.00 - CA$50.00
CA$50.00

Baader Wide T-Ring Nikon Z - T-2 & S52

BAA-2408335

Connects Nikon Z-mount cameras to telescopes Features a standard T-2 (M42x0.75) internal thread Includes a larger S52 dovetail outer ring for wide...

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CA$50.00 - CA$50.00
CA$50.00
CA$50.00 - CA$50.00
CA$50.00
CA$50.00 - CA$50.00
CA$50.00
CA$50.00 - CA$50.00
CA$50.00

Baader Wide T-Ring Sony Alpha and Minolta Maxxum - T-2 and S52

BAA-2408334
1 in stock

Connects Sony Alpha & Minolta Maxxum cameras to telescopes Features a native S52 dovetail for a wider light path Includes a removable T-2 (M42...

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CA$50.00 - CA$50.00
CA$50.00
CA$50.00 - CA$50.00
CA$50.00
CA$46.00 - CA$46.00
CA$46.00
CA$46.00 - CA$46.00
CA$46.00

Baader Wide-T-Ring Fujifilm X with D52i to T-2 and S52

BAA-2408331
1 in stock

Connects Fujifilm X-mount cameras to telescopes Features a wide S52 dovetail connection for maximum clear aperture Includes a removable T-2 (M42x0...

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

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.