Passer au contenu

Langue

Pays

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

Prix d'origine $130.00 - Prix d'origine $130.00
Prix d'origine
$130.00
$130.00 - $130.00
Prix actuel $130.00

Starlight Instruments Adaptateur pour Réducteur 0.85x Orion - M42x0.75

SI-A20-287B

Cet adaptateur vous permet de fixer n'importe quel adaptateur à filetage en T standard au réducteur de focale Orion 0,85 Caractéristiques U...

Afficher tous les détails
Prix d'origine $130.00 - Prix d'origine $130.00
Prix d'origine
$130.00
$130.00 - $130.00
Prix actuel $130.00
Prix d'origine $8.63 - Prix d'origine $8.63
Prix d'origine
$8.63
$8.63 - $8.63
Prix actuel $8.63

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...

Afficher tous les détails
Prix d'origine $8.63 - Prix d'origine $8.63
Prix d'origine
$8.63
$8.63 - $8.63
Prix actuel $8.63
Prix d'origine $11.71 - Prix d'origine $11.71
Prix d'origine
$11.71
$11.71 - $11.71
Prix actuel $11.71

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...

Afficher tous les détails
Prix d'origine $11.71 - Prix d'origine $11.71
Prix d'origine
$11.71
$11.71 - $11.71
Prix actuel $11.71
Prix d'origine $18.39 - Prix d'origine $18.39
Prix d'origine
$18.39
$18.39 - $18.39
Prix actuel $18.39

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

SV-F9160A
2 en stock

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

Afficher tous les détails
Prix d'origine $18.39 - Prix d'origine $18.39
Prix d'origine
$18.39
$18.39 - $18.39
Prix actuel $18.39
Prix d'origine $11.70 - Prix d'origine $11.70
Prix d'origine
$11.70
$11.70 - $11.70
Prix actuel $11.70

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 ...

Afficher tous les détails
Prix d'origine $11.70 - Prix d'origine $11.70
Prix d'origine
$11.70
$11.70 - $11.70
Prix actuel $11.70
Prix d'origine $14.05 - Prix d'origine $14.05
Prix d'origine
$14.05
$14.05 - $14.05
Prix actuel $14.05

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...

Afficher tous les détails
Prix d'origine $14.05 - Prix d'origine $14.05
Prix d'origine
$14.05
$14.05 - $14.05
Prix actuel $14.05
Prix d'origine $19.99 - Prix d'origine $19.99
Prix d'origine
$19.99
$19.99 - $19.99
Prix actuel $19.99

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...

Afficher tous les détails
Prix d'origine $19.99 - Prix d'origine $19.99
Prix d'origine
$19.99
$19.99 - $19.99
Prix actuel $19.99
Prix d'origine $17.99 - Prix d'origine $17.99
Prix d'origine
$17.99
$17.99 - $17.99
Prix actuel $17.99

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...

Afficher tous les détails
Prix d'origine $17.99 - Prix d'origine $17.99
Prix d'origine
$17.99
$17.99 - $17.99
Prix actuel $17.99
Prix d'origine $31.99 - Prix d'origine $31.99
Prix d'origine
$31.99
$31.99 - $31.99
Prix actuel $31.99

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...

Afficher tous les détails
Prix d'origine $31.99 - Prix d'origine $31.99
Prix d'origine
$31.99
$31.99 - $31.99
Prix actuel $31.99
Prix d'origine $20.79 - Prix d'origine $20.79
Prix d'origine
$20.79
$20.79 - $20.79
Prix actuel $20.79

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

SV-F9190A
2 en stock

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

Afficher tous les détails
Prix d'origine $20.79 - Prix d'origine $20.79
Prix d'origine
$20.79
$20.79 - $20.79
Prix actuel $20.79
Prix d'origine $23.99 - Prix d'origine $23.99
Prix d'origine
$23.99
$23.99 - $23.99
Prix actuel $23.99

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...

Afficher tous les détails
Prix d'origine $23.99 - Prix d'origine $23.99
Prix d'origine
$23.99
$23.99 - $23.99
Prix actuel $23.99
Prix d'origine $10.67 - Prix d'origine $10.67
Prix d'origine
$10.67
$10.67 - $10.67
Prix actuel $10.67

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 ...

Afficher tous les détails
Prix d'origine $10.67 - Prix d'origine $10.67
Prix d'origine
$10.67
$10.67 - $10.67
Prix actuel $10.67
Prix d'origine $7.99 - Prix d'origine $7.99
Prix d'origine
$7.99
$7.99 - $7.99
Prix actuel $7.99

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...

Afficher tous les détails
Prix d'origine $7.99 - Prix d'origine $7.99
Prix d'origine
$7.99
$7.99 - $7.99
Prix actuel $7.99
Prix d'origine $19.19 - Prix d'origine $19.19
Prix d'origine
$19.19
$19.19 - $19.19
Prix actuel $19.19

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...

Afficher tous les détails
Prix d'origine $19.19 - Prix d'origine $19.19
Prix d'origine
$19.19
$19.19 - $19.19
Prix actuel $19.19
Prix d'origine $7.99 - Prix d'origine $7.99
Prix d'origine
$7.99
$7.99 - $7.99
Prix actuel $7.99

SVBONY SV194 T2 M42x0.75 Photography Adapter for Nikon

SV-W1077A

Connects Nikon F-Mount cameras to standard T-threads Standard M42x0.75 female threads for wide compatibility Enables prime-focus astrophotography ...

Afficher tous les détails
Prix d'origine $7.99 - Prix d'origine $7.99
Prix d'origine
$7.99
$7.99 - $7.99
Prix actuel $7.99
Prix d'origine $9.59 - Prix d'origine $9.59
Prix d'origine
$9.59
$9.59 - $9.59
Prix actuel $9.59

SVBONY SV194 Wide 48mm T-Ring Adapter for Nikon F-Mount

SV-W1077B

Connects Nikon F-Mount cameras to M48 (2-inch filter) threads Wide 48mm clear aperture minimizes vignetting on full-frame sensors Precision-machin...

Afficher tous les détails
Prix d'origine $9.59 - Prix d'origine $9.59
Prix d'origine
$9.59
$9.59 - $9.59
Prix actuel $9.59
Prix d'origine $7.99 - Prix d'origine $7.99
Prix d'origine
$7.99
$7.99 - $7.99
Prix actuel $7.99

SVBONY SV195 M42x0.75 T-Ring Adapter for Canon EOS DSLR

SV-W2054A

Connects Canon EOS DSLR cameras to standard telescope T-threads Features a 3-screw mechanism for precise rotational adjustment Allows for fine-tun...

Afficher tous les détails
Prix d'origine $7.99 - Prix d'origine $7.99
Prix d'origine
$7.99
$7.99 - $7.99
Prix actuel $7.99
Prix d'origine $9.59 - Prix d'origine $9.59
Prix d'origine
$9.59
$9.59 - $9.59
Prix actuel $9.59

SVBONY SV195 M48x0.75 T-Ring Adapter for Canon EOS DSLR

SV-W2054B

Connects Canon EF/EF-S mount cameras to M48x0.75 threaded accessories 3-screw system allows for precise sensor tilt and orthogonality adjustment M...

Afficher tous les détails
Prix d'origine $9.59 - Prix d'origine $9.59
Prix d'origine
$9.59
$9.59 - $9.59
Prix actuel $9.59
Prix d'origine $3.64 - Prix d'origine $3.64
Prix d'origine
$3.64
$3.64 - $3.64
Prix actuel $3.64

SVBONY T-Adapter Mount with M42 Threads - 1.25"

SV-F9103A

Connects M42 T-thread cameras to 1.25" focusers Standard M42 x 0.75 male threads Fits any telescope with a 1.25" eyepiece holder Lightweight desig...

Afficher tous les détails
Prix d'origine $3.64 - Prix d'origine $3.64
Prix d'origine
$3.64
$3.64 - $3.64
Prix actuel $3.64
Prix d'origine $15.99 - Prix d'origine $15.99
Prix d'origine
$15.99
$15.99 - $15.99
Prix actuel $15.99

SVBONY Telescope Eyepiece Adapter with Coaxial Lock and PTFE Inner Ring - 1.25"

SV-F9164A

Adapts M42 threaded accessories to 1.25" focusers and holders Coaxial locking mechanism ensures a self-centering, secure grip PETF inner ring prev...

Afficher tous les détails
Prix d'origine $15.99 - Prix d'origine $15.99
Prix d'origine
$15.99
$15.99 - $15.99
Prix actuel $15.99
Prix d'origine $14.39 - Prix d'origine $14.39
Prix d'origine
$14.39
$14.39 - $14.39
Prix actuel $14.39

SVBONY Telescope Focuser Adapter M42x0.75 for Reflectors - 1.25"

SV-F9163A

Adapts M42x0.75 male threads to accept 1.25" eyepieces and accessories Provides 37mm to 47mm of adjustable focus distance Three locking thumbscrew...

Afficher tous les détails
Prix d'origine $14.39 - Prix d'origine $14.39
Prix d'origine
$14.39
$14.39 - $14.39
Prix actuel $14.39
Prix d'origine $62.00 - Prix d'origine $62.00
Prix d'origine
$62.00
$62.00 - $62.00
Prix actuel $62.00

Tele Vue 1.25" PowerMate T-Ring Adapter

TV-PTR-1250
1 en stock

Connection Side 1: Male T-Thread (M42x0.75) Connection Side 2: Female Thread for 1.25" Powermate Compatibility: Tele Vue 2.5x and 5x 1.25" Powerma...

Afficher tous les détails
Prix d'origine $62.00 - Prix d'origine $62.00
Prix d'origine
$62.00
$62.00 - $62.00
Prix actuel $62.00
Prix d'origine $23.00 - Prix d'origine $23.00
Prix d'origine
$23.00
$23.00 - $23.00
Prix actuel $23.00

Tele Vue 2.4" Accessory Tube - 0.040" (1mm)

TV-TLF-0040

Extension Provided: 1mm (0.040") Accessory Standard: Tele Vue 2.4" Imaging System Connection Type: Threaded Material: Black Anodized Aluminum Oute...

Afficher tous les détails
Prix d'origine $23.00 - Prix d'origine $23.00
Prix d'origine
$23.00
$23.00 - $23.00
Prix actuel $23.00
Prix d'origine $23.00 - Prix d'origine $23.00
Prix d'origine
$23.00
$23.00 - $23.00
Prix actuel $23.00

Tele Vue 2.4" Accessory Tube - 0.080" (2mm)

TV-TLG-0080

Extension Length: 2mm (0.080") Connection Type: Tele Vue 2.4" Proprietary Thread Format: Accessory Tube Material: Black Anodized Aluminum Compatib...

Afficher tous les détails
Prix d'origine $23.00 - Prix d'origine $23.00
Prix d'origine
$23.00
$23.00 - $23.00
Prix actuel $23.00

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.