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.
Filters
Baader Hyperion DT-Ring - SP54/M43
Connects Baader Hyperion Eyepieces to M43 Camera Threads SP54 Female Thread for Eyepiece Connection M43 Male Thread for Camera Lens Connection Eng...
View full detailsBaader Hyperion DT-Ring - SP54/M46
Adapts Baader Hyperion Eyepieces with SP54 threads Provides a male M46 thread for camera connection Engineered for afocal photography (digiscoping...
View full detailsBaader Hyperion DT-Ring - SP54/M49
Adapts Hyperion SP54 Threads to M49 Optimized for Minimal Optical Distance Essential for Afocal Photography (Digiscoping) Secure, Rigid Threaded C...
View full detailsBaader Hyperion DT-Ring - SP54/M52
Connects M52 camera threads to SP54 eyepiece threads Engineered for minimum optical distance Provides a secure, rigid connection for afocal photog...
View full detailsBaader Hyperion DT-Ring - SP54/M55
Connects Baader Hyperion eyepieces to cameras with M55 filter threads Utilizes the eyepiece's native SP54 thread for a direct connection Engineere...
View full detailsBaader Hyperion DT-Ring - SP54/M58
Connects Baader Hyperion eyepieces to camera lenses Features SP54 eyepiece-side threads Features M58 camera-side filter threads Enables rigid, sec...
View full detailsBaader Hyperion DT-Ring - SP54/M62
Connects Digital Cameras to Baader Hyperion Eyepieces Engineered for the Shortest Possible Optical Path Minimizes Vignetting for Brighter, Fuller ...
View full detailsBaader Hyperion Extension Ring - SP54/SP54 11mm Long
Adds a precise 11mm of optical path length Features male and female SP54 threads Integrates with the Baader Hyperion eyepiece system Enables preci...
View full detailsBaader Hyperion Finetuning-Ring - 14mm M48/M48
14mm Extension Length M48 Male and Female Threads Compatible with Baader Hyperion Modular Eyepieces Increases Eyepiece Magnification Maintains Opt...
View full detailsBaader Hyperion Finetuning-Ring - 28mm M48/M48
28mm Optical Extension M48 Male and Female Threads Modifies Eyepiece Focal Length Compatible with Baader Hyperion Eyepieces Maintains Optical Alig...
View full detailsBaader Hyperion T-Adapter - M43/T-2
Adapts Baader Hyperion M43 thread to T-2 (M42x0.75) Enables Eyepiece Projection Astrophotography Creates a Rigid, Threaded Connection to a Camera ...
View full detailsBaader Hyperion T-Adapter - M54/T-2
Connects Hyperion MkIII Zoom to T-2 T-Rings Female M54 Eyepiece-Side Thread Male T-2 Camera-Side Thread Enables Rigid, Secure Afocal Astrophotogra...
View full detailsBaader Hyperion Zoom Adapter - M43/M54
Connects Hyperion Zoom Mark III Eyepiece to a camera lens Enables afocal projection photography and digiscoping Provides M43 female thread for eye...
View full detailsBaader Hyperion Zoom Mark IV to M54 Kowa TSN 770/880
Connects Baader Hyperion Zoom Mark IV to Kowa spotting scopes Designed for Kowa TSN 770 and TSN 880 series Utilizes the scope's native M54 male th...
View full detailsBaader M48 Extension Tube - 10mm
Adds 10mm of optical path length M48 x 0.75 female and male threads Ideal for full-frame sensors to prevent vignetting Features Baader's modern 3m...
View full detailsBaader M48 Extension Tube - 15mm
Adds exactly 15mm of optical path length M48 x 0.75 female and male threads Compatible with 2-inch filter systems Machined for modern, short back-...
View full detailsBaader M48 Extension Tube - 5mm
Adds a fixed 5mm of optical path length Standard M48 x 0.75 filter threads Essential for precise back focus adjustment Rigid, non-flexing aluminum...
View full detailsBaader M48 Extension Tube 30mm / 2" Nosepiece with Safety Kerfs
Adds exactly 30mm of optical path length Functions as a standard 2" nosepiece Connects M48x0.75 female threads to a 2" focuser Features Baader's p...
View full detailsBaader M48 Extension Tube 40mm / 2" Nosepiece with Safety Kerfs
Adds a fixed 40mm of optical path length Functions as both an M48 extension tube and a 2" nosepiece Features M48 x 0.75 female and male threads fo...
View full detailsBaader M48 Fine-Adjustment Aluminum Ring - 0.3/0.5/1mm
Precisely control rotational alignment and spacing Available in 0.3mm, 0.5mm, and 1.0mm thicknesses Standard M48 x 0.75 (2-inch filter) threading ...
View full detailsBaader M48 Spacer Ring for MPCC III / Protective EOS T-Ring
Connects the Baader MPCC Mark III to the Baader Protective EOS T-Ring Establishes the critical 55mm back focus distance for coma correction Featur...
View full detailsBaader M54x0.75 Inverter Ring
Converts female M54x0.75 threads to male M54x0.75 threads Enables connection between two components with female M54 ports Part of the Baader Plane...
View full detailsBaader M68 Extension Tube - 100mm
Provides a fixed 100mm extension length Connects via the robust M68 thread standard Eliminates tilt and flexure common in heavy imaging trains Fun...
View full detailsBaader M68 Extension Tube - 10mm
Adds 10mm of fixed extension Connects via the M68 x 1 thread standard Provides a rigid, non-flexing connection for heavy cameras Integral part of ...
View full detailsUnderstanding 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.