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 Planetarium M68 VariLock Extension – 15-20 mm
Variable extension from 15mm to 20mm M68x1 thread standard Features M68 dovetail and receptor Enables precise back focus adjustment Allows for cam...
View full detailsBaader Planetarium M68-Tilter (0 - 1° image correction)
Corrects for sensor tilt and optical train misalignment Provides a 0° to 1° tilt adjustment range Adds a minimal 9.5 mm to 10.25 mm of optical len...
View full detailsBaader Planetarium Mark IV Zoom Adapter to M45 – for Zeiss-Diascope
Adapts Baader Hyperion Mark IV Zoom eyepiece to Zeiss Diascopes Provides a secure M45x0.5 threaded connection Ensures perfect optical alignment Re...
View full detailsBaader Planetarium Protective T-Ring Canon EOS to T-2/M48i with 2" Nosepiece
Adapts Canon EOS DSLR cameras to telescopes Internal holder for mounting filters Provides a protective dust seal for the camera sensor Offers T-2 ...
View full detailsBaader Planetarium S58 to M68a Adapter
Adapts S58-long threads to the M68a standard Low-profile "short" design minimizes back focus consumption Engineered for the Baader BACHES Echelle-...
View full detailsBaader Planetarium T-2 Tilter (0 - 1° image correction)
Corrects sensor tilt for sharp stars edge-to-edge Provides 0 to 1° of fine tilt adjustment Features standard T-2 (M42x0.75) threads for universal ...
View full detailsBaader Planetarium UFC Camera-Adapter S58 – Optical height: 7.2 mm
Adds 7.2 mm of Optical Height S58 Dovetail Interface Aligns UFC Filter Slider with 2" Diagonals Prevents Physical Interference Maintains a Rigid O...
View full detailsBaader Planetarium UFC S70 Base Connector – Optical height: 2 mm
Connects multiple Baader UFC filter bases Adds only 2 mm of optical height to the imaging train Provides a camera-side S70 dovetail co...
View full detailsBaader Planetarium UFC Telescope-Adapter S70a to M54i – Optical height: 1.5 mm
Adapts Baader S70 Dovetail to M54 Female Thread Optical Height: 1.5 mm Connection Type: Telescope-Side Adapter Part of the Baader Universal Filter...
View full detailsBaader Planetarium UFC Telescope-Adapter S70a to M57a
Adapts Baader S70 Dovetail to an M57x0.75 Male Thread Telescope-Side Adapter for the Universal Filter Changer (UFC) System Optimized for Borg Tele...
View full detailsBaader Planetarium UFC-Tilter (0-1° Image Correction)
Provides 0 - 1° of mechanical tilt for image plane correction Adds approximately 10 mm of optical height to the imaging train Designed for integra...
View full detailsBaader Planetarium Wide-T-Ring for Leica, Sigma, & Panasonic L-Mount
Connects Leica, Sigma, and Panasonic L-mount cameras to telescopes Native Baader S52 dovetail connection for maximum clear aperture Includes a rem...
View full detailsBaader Pushfix Low Profile Adapter - 1.25"/2" for Steeltrack NT Focusers
Reduces 2" focusers to accept 1.25" accessories Designed specifically for Baader Steeltrack NT focusers Pushfix quick-release mechanism with adjus...
View full detailsBaader Rubber/Metal Foldable Morpheus Eyecup M43
Foldable rubber eyecup Designed for observers with or without eyeglasses Durable metal base with M43 threads Blocks stray light to improve contras...
View full detailsBaader Steel Change Ring to fit Zeiss Adapter System (Dovetail-Ring Only) - M68/S68
Connects Baader M68 System to Zeiss S68 Dovetail All-Steel Construction for Maximum Rigidity Eliminates Flexure and Tilt in Imaging Trains Enables...
View full detailsBaader Stop-Ring -1.25"
Sets a repeatable, precise focus position for any 1.25" accessory Ideal for parfocalizing a set of eyepieces Reduces time spent refocusing when sw...
View full detailsBaader T-2 Conversion Ring - 10mm T-2(F)/T-2(F)
10mm Fixed Extension Length T-2 Female to T-2 Female Threads Part of the Baader T-2 Astro System Joins Two Male T-2 Threaded Accessories Precision...
View full detailsBaader T-2 Delrin Spacer Ring Set - 15pc
Set of 15 Spacer Rings Includes 5 Different Thicknesses (0.6mm, 0.8mm, 1.0mm, 1.2mm, 1.4mm) 3 Rings of Each Size Enables Rotational "Clocking" of ...
View full detailsBaader T-2 Extension Tube- 15mm
Adds a fixed 15mm of optical path length Standard T-2 (M42x0.75) male and female threads Precision-machined for accurate, repeatable spacing Matte...
View full detailsBaader T-2 Extension Tube- 40mm
Adds exactly 40mm of optical path length Standard T-2 (M42x0.75) male and female threads Provides rigid, non-flexing spacing for astrophotography ...
View full detailsBaader T-2 Extension Tube- 7.5mm
Adds 7.5mm of fixed optical path length Part of the modular Baader T-2 Astro System Standard T-2 (M42x0.75) internal and external threads Precisio...
View full detailsBaader T-2 Fine-Adjustment Aluminum Ring - 0.3/0.5/1mm
Precision T-2 thread shims for rotational alignment Available in 0.3mm, 0.5mm, and 1.0mm thicknesses Ultra-thin design minimizes impact on back fo...
View full detailsBaader T-2 Inverter Ring - T-2(F)/T-2(F)
Connects Two Female T-2 Threaded Accessories Provides a Male-to-Male T-2 Bridge Low-Profile Design Minimizes Added Length Part of the Baader Astro...
View full detailsBaader T-2 Locking Ring (2mm length)
Adds a precise 2mm of optical path length Enables full 360° rotational adjustment for cameras and accessories Locks components securely at any ori...
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.