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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.

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CA$112.00 - CA$112.00
CA$112.00
CA$112.00 - CA$112.00
CA$112.00

Starlight Instruments Adaptateur pour Oculaires "Easy Grip" avec Anneau de Compression - Oculaires 1.25"

SI-EA20-205EG

Adaptateur d'oculaire de 2,0"" de diamètre ""Easy Grip"" avec bague de compression (convient aux oculaires de 1,25"") . Caractéristiques C...

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CA$112.00 - CA$112.00
CA$112.00
CA$112.00 - CA$112.00
CA$112.00
CA$112.00 - CA$112.00
CA$112.00
CA$112.00 - CA$112.00
CA$112.00

Starlight Instruments Adaptateur pour Oculaires Flush Mount avec Anneau de Compression - Oculaires 1.25"

SI-EA20-205LP

Adaptateur d'oculaire de 5,1 cm de diamètre , montage encastré avec bague de compression (convient aux oculaires de 3,2 cm). Caractéristiques ...

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CA$112.00 - CA$112.00
CA$112.00
CA$112.00 - CA$112.00
CA$112.00
CA$378.00 - CA$378.00
CA$378.00
CA$378.00 - CA$378.00
CA$378.00

Starlight Instruments Adaptateur pour Oculaires Leica

SI-EA20-EP2-L-37

Cet adaptateur d'oculaire a été conçu avec un système de libération de type baïonnette qui vous permet de retirer rapidement et facilement votre oc...

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CA$378.00 - CA$378.00
CA$378.00
CA$378.00 - CA$378.00
CA$378.00
CA$154.00 - CA$154.00
CA$154.00
CA$154.00 - CA$154.00
CA$154.00

Starlight Instruments Adaptateur pour Oculaires pour Réducteur Vixen

SI-EA20-205-60

Adaptateur d'oculaire 2.0 "" pour réducteur de focale Vixen. Cet adaptateur peut être utilisé dans n'importe quelle ouverture de 2,0 "" Caractéri...

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CA$154.00 - CA$154.00
CA$154.00
CA$154.00 - CA$154.00
CA$154.00
Starlight Instruments Eyepiece Adapter w/ Bayonet Release for Leica Eyepiece
CA$336.00 - CA$336.00
CA$336.00
CA$336.00 - CA$336.00
CA$336.00

Starlight Instruments Eyepiece Adapter w/ Bayonet Release for Leica Eyepiece

SI-EA20-EP2-L-40

Bayonet-Style Quick Release Exclusively for Leica Eyepieces Secure, Positive-Locking Mechanism Single-Action Twist to Lock and Unlock Eliminates T...

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CA$336.00 - CA$336.00
CA$336.00
CA$336.00 - CA$336.00
CA$336.00
SVBONY 1.25" to C Mount Adapter for Telescope Astrophotography
CA$12.00 - CA$12.00
CA$12.00
CA$12.00 - CA$12.00
CA$12.00

SVBONY 1.25" to C-Mount Adapter for Telescope Astrophotography

SV-W2159A

Securely connects 1.25" focal reducers to C-mount cameras All-metal construction prevents flexure and maintains alignment Eliminates loose connect...

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CA$12.00 - CA$12.00
CA$12.00
CA$12.00 - CA$12.00
CA$12.00
SVBONY CA1 All-Metal Telescope to SLR Camera Adapter Photography Tube
CA$16.00 - CA$16.00
CA$16.00
CA$16.00 - CA$16.00
CA$16.00

SVBONY CA1 Astronomical Telescope to SLR Camera Adapter Tube

SV-F9105A

Achieve Prime Focus with SLR/DSLR Cameras Provides Necessary Focuser Extension All-Metal Aluminum Construction Lightweight and Durable Design Wide...

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CA$16.00 - CA$16.00
CA$16.00
CA$16.00 - CA$16.00
CA$16.00
SVBONY M42x0.75 Extension Tube Kit (5mm, 10mm, 15mm, 20mm)
CA$26.00 - CA$26.00
CA$26.00
CA$26.00 - CA$26.00
CA$26.00

SVBONY M42x0.75 Extension Tube Kit (5mm, 10mm, 15mm, 20mm)

SV-F9160A

Includes four M42 extension tubes: 5mm, 10mm, 15mm, and 20mm Standard M42x0.75mm T2 male and female threads Stackable to achieve combined lengths ...

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CA$26.00 - CA$26.00
CA$26.00
CA$26.00 - CA$26.00
CA$26.00
SVBONY SA404 M48 to M42 Telescope Adapter
CA$16.00 - CA$16.00
CA$16.00
CA$16.00 - CA$16.00
CA$16.00

SVBONY SA404 M48 Female to M42 Male Telescope Adapter

SV-W9165A

Connects M42 (T2) accessories to M48 (2") threaded components Machined from aluminum alloy to a 0.1mm accuracy Adds a precise 31.5mm of height to ...

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CA$16.00 - CA$16.00
CA$16.00
CA$16.00 - CA$16.00
CA$16.00
SVBONY SA406 Eyepiece Adapter for SA401 Spotting Scope to SV230/SV245
CA$20.00 - CA$20.00
CA$20.00
CA$20.00 - CA$20.00
CA$20.00

SVBONY SA406 Eyepiece Adapter for SA401 Spotting Scope to SV230/SV245 - 1.25"

SV-W9170A

Connects SA401 Scope to 1.25" Eyepieces Optimized for SV230 & SV245 Zoom Eyepieces Durable All-Metal Construction Ensures Correct Focus is Mai...

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CA$20.00 - CA$20.00
CA$20.00
CA$20.00 - CA$20.00
CA$20.00
SVBONY SV109 Variable M42 Thread Extension Tube
CA$28.00 - CA$28.00
CA$28.00
CA$28.00 - CA$28.00
CA$28.00

SVBONY SV109 M42 Variable Extension Tube

SV-F9180A

Variable Extension Range: 24mm to 35mm Male Thread: M42*0.75 (T2-thread) Female Thread: M42*0.75 (T2-thread) All-Metal Construction Black Anodized...

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CA$28.00 - CA$28.00
CA$28.00
CA$28.00 - CA$28.00
CA$28.00
Svbony SV109 M48 Variable Extension Tube 24-35mm
CA$25.00 - CA$25.00
CA$25.00
CA$25.00 - CA$25.00
CA$25.00

SVBONY SV109 M48 Variable Extension Tube 24-35mm

SV-F9180B

Variable Extension Range: 24mm to 35mm Thread Type: M48x0.75 Male & Female Replaces Multiple Fixed Spacer Rings Internal Anti-Reflection Baffl...

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CA$25.00 - CA$25.00
CA$25.00
CA$25.00 - CA$25.00
CA$25.00
SVBONY SV112 1.25inch Eyepiece Projection Kit for Telescope Astrophotography
CA$45.00 - CA$45.00
CA$45.00
CA$45.00 - CA$45.00
CA$45.00

SVBONY SV112 Eyepiece Projection Kit - 1.25"

SV-F9183A

Adapts SLR/DSLR cameras to a 1.25" telescope focuser Supports both prime focus and eyepiece projection astrophotography Variable projection length...

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CA$45.00 - CA$45.00
CA$45.00
CA$45.00 - CA$45.00
CA$45.00
SVBONY SV119 M48 Extension Tube Kit (5mm, 10mm, 15mm, 30mm)
CA$29.00 - CA$29.00
CA$29.00
CA$29.00 - CA$29.00
CA$29.00

SVBONY SV119 M48x0.75 Extension Tube Kit (5mm, 10mm, 15mm, 30mm)

SV-F9190A

Four-piece M48 extension tube kit Includes 5mm, 10mm, 15mm, and 30mm lengths Standard M48x0.75 male and female threads Stackable design for custom...

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CA$29.00 - CA$29.00
CA$29.00
CA$29.00 - CA$29.00
CA$29.00
SVBONY SV123 Black Metal Spotting Scope Camera Adapter
CA$34.00 - CA$34.00
CA$34.00
CA$34.00 - CA$34.00
CA$34.00

SVBONY SV123 Black Metal Extendable Spotting Scope Camera Adapter

SV-F9194A

Connects to DSLR cameras via a standard M42x0.75 T-thread Clamps onto spotting scope eyepieces with a 49mm-58mm external diameter Provides up to 3...

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CA$34.00 - CA$34.00
CA$34.00
CA$34.00 - CA$34.00
CA$34.00
Svbony SV125 Black 2'' to T2 Camera Adapter for SLR Cameras
CA$15.00 - CA$15.00
CA$15.00
CA$15.00 - CA$15.00
CA$15.00

SVBONY SV125 Black 2" to T2 Camera Adapter for SLR Cameras

SV-F9196A

Adapts 2" (50.8mm) focusers to M42*0.75 T-threads Connects SLR/DSLR cameras via a standard T-Ring Features female M48*0.75 threads for 2" filters ...

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CA$15.00 - CA$15.00
CA$15.00
CA$15.00 - CA$15.00
CA$15.00
Svbony SV130 Black M48 to M42 Knurling Design Telescope Adapter
CA$11.00 - CA$11.00
CA$11.00
CA$11.00 - CA$11.00
CA$11.00

SVBONY SV130 Black M48 to M42 Telescope Adapter

SV-W9100A

Converts M48 Female Threads to M42 Male T-Threads Enables Connection of M42 T-Rings and Accessories to M48 Correctors Knurled Exterior for a Secur...

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CA$11.00 - CA$11.00
CA$11.00
CA$11.00 - CA$11.00
CA$11.00
SVBONY SV149 Canon DSLR Lens to Eyepiece Adapter - 1.25"
SVBONY SV149 Canon DSLR Lens to Eyepiece Adapter - 1.25"
CA$26.00 - CA$26.00
CA$26.00
CA$26.00 - CA$26.00
CA$26.00

SVBONY SV149 Canon DSLR Lens to Eyepiece Adapter - 1.25"

SV-W9112A

Adapts Canon EF and EF-S mount lenses to 1.25" astronomy accessories Enables use of high-quality camera lenses for wide-field astrophotography Acc...

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CA$26.00 - CA$26.00
CA$26.00
CA$26.00 - CA$26.00
CA$26.00
SVBONY SV149 Nikon AF Lens to Eyepiece Adapter - 1.25"
SVBONY SV149 Nikon AF Lens to Eyepiece Adapter - 1.25"
CA$29.00 - CA$29.00
CA$29.00
CA$29.00 - CA$29.00
CA$29.00

SVBONY SV149 Nikon AF Lens to Eyepiece Adapter - 1.25"

SV-W9112B

Connects Nikon AF-Mount Lenses to any 1.25" Eyepiece Focuser Durable Aluminum Alloy Construction Lightweight Design at only 137g (4.84oz) Standard...

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CA$29.00 - CA$29.00
CA$29.00
CA$29.00 - CA$29.00
CA$29.00
SVBONY SV157 1.25-inch Extension Tube (56mm / 70mm)
CA$16.00 - CA$16.00
CA$16.00
CA$16.00 - CA$16.00
CA$16.00

SVBONY SV157 56mm Extension Tube - 1.25"

SV-W9118A

Adds a fixed 56mm or 70mm of back focus Standard 1.25-inch barrel diameter CNC-machined aluminum for rigidity Matte black interior prevents intern...

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CA$16.00 - CA$16.00
CA$16.00
CA$16.00 - CA$16.00
CA$16.00
SVBONY SV157 1.25-inch Extension Tube
CA$17.00 - CA$17.00
CA$17.00
CA$17.00 - CA$17.00
CA$17.00

SVBONY SV157 70mm Extension Tube - 1.25"

SV-W9118B

Adds Critical Focuser Out-Travel Standard 1.25-inch Barrel Diameter Improves Focus for Astrophotography Cameras CNC-Machined Aluminum Construction...

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CA$17.00 - CA$17.00
CA$17.00
CA$17.00 - CA$17.00
CA$17.00
SVBONY SV158 75mm Extension Tube 2 inch
CA$19.00 - CA$19.00
CA$19.00
CA$19.00 - CA$19.00
CA$19.00

SVBONY SV158 75mm Extension Tube - 2"

SV-W9119A

2-Inch Barrel Diameter CNC-Machined Aluminum Alloy Black Anodized Finish Adds Back Focus for Imaging Description FAQ Specifications In the Box ...

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CA$19.00 - CA$19.00
CA$19.00
CA$19.00 - CA$19.00
CA$19.00
SVBONY SV158 75mm Extension Tube 2 inch
CA$21.00 - CA$21.00
CA$21.00
CA$21.00 - CA$21.00
CA$21.00

SVBONY SV158 90mm Extension Tube - 2"

SV-W9119B

Adds Critical Spacing to 2-inch Focusers Solves Focuser Travel Limitations CNC-Machined Aluminum Alloy Construction Standard 2-inch Barrel Diamete...

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CA$21.00 - CA$21.00
CA$21.00
CA$21.00 - CA$21.00
CA$21.00
SVBONY SV167 Camera Adapter for SCT Prime Focus Photography
CA$27.00 - CA$27.00
CA$27.00
CA$27.00 - CA$27.00
CA$27.00

SVBONY SV167 Camera Adapter for SCT Prime Focus Photography

SV-W9127A

Connects SCT Telescopes to T-Thread Cameras Male Thread: Standard SCT Female Thread: M42x0.75 T-Thread Extension Travel: 30mm (1.18 inches) Net We...

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CA$27.00 - CA$27.00
CA$27.00
CA$27.00 - CA$27.00
CA$27.00

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.