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
Player One CS-1.25 Adapter
Connects CS-mount lenses to 1.25" cameras Female Thread: CS-Mount Male Thread: M28.5x0.6mm (Standard 1.25" Filter Thread) Ideal for creating compa...
View full detailsPlayer One CS-M42 Adapter
Connects CS-Mount Female Threads to M42 Male Threads Adapts Small-Format Cameras to Standard T2 Accessories Enables Use of Filter Wheels and Focal...
View full detailsPlayer One M42F-M42M Adapter - 20mm
Provides a fixed 20mm spacing extension Female Thread: M42 x 0.75 Male Thread: M42 x 0.75 Corrects back focus for flatteners and reducers Standard...
View full detailsPlayer One M42F-M48M Adapter - 0mm
Adapts M48x0.75 male threads to M42x0.75 female threads Adds 0mm of optical path length, preserving critical back focus Connects M42 T-thread came...
View full detailsPlayer One M48 Camera Tilter Plate - Third-Party Filter Wheel Adapter
Adapts Player One cooled cameras to popular third-party filter wheels Features a standard M48x0.75 female thread for secure connection Integrated ...
View full detailsPlayer One M48F-M42M Adapter - 17.5mm
Adds a precise 17.5mm of optical path length Converts female M48x0.75 threads to male M42x0.75 T-threads Connects M48 accessories like flatteners ...
View full detailsPlayer One M48F-M48M Adapter - 20mm
Adds exactly 20mm of optical length M48x0.75 female (input) and male (output) threads Maintains a rigid connection in the imaging train Standard 2...
View full detailsPlayer One M48F-M54M Adapter - 17.5mm
Provides a precise 17.5mm of optical length Connects M48x0.75 female threads to M54x0.75 male threads Enables use of 2-inch filters in larger M54 ...
View full detailsPlayer One M48M-M42M Adapter - 2mm
Adapts M48x0.75mm Female Threads to M42x0.75mm Female Threads Provides 2mm of Optical Path Length Male Threads on Both Sides (M48M-M42M) Standard ...
View full detailsPlayer One M48M-M48F Adapter - 17.5mm
Adds 17.5mm of optical path length Connects M48x0.75 male to M48x0.75 female threads Standard M48 threading is compatible with 2" filters Machined...
View full detailsPlayer One M48M-M48M Gender Changer Adapter - 2mm
Connects two female M48 threaded accessories Provides M48x0.75mm male threads on both sides Adds a precise 2mm of optical path length Ideal for fi...
View full detailsPlayer One M54M-M42M Adapter - 2mm
Connects Player One Filter Drawer MAX to Ares & Uranus Cameras Provides 2mm of Optical Path Length Thread Type 1: M54x0.75 Male Thread Type 2:...
View full detailsPlayer One M54M-M48M Adapter - 2mm
Converts M54x0.75 Male Threads to M48x0.75 Male Threads Adds a Fixed 2mm of Optical Path Length Male-to-Male Design for Connecting Female-Threaded...
View full detailsPlayer One M54M-M54F Adapter - 17.5mm
Optical Length (17.5mm): Adds a fixed 17.5mm of spacing, a common requirement for achieving 55mm back focus with filter wheels and off-axis guide...
View full detailsPlayer One M54M-M54F Adapter - 20mm
Adds 20mm of extension to an optical train Connects M54 x 0.75 male to M54 x 0.75 female threads Precision-machined for a secure, tilt-free fit Ma...
View full detailsPlayer One M54M-M54M Adapter - 2mm
Adds 2mm of Optical Path Length Connects Two M54x0.75 Female Threads Functions as a Spacer and Gender Changer Standard M54 x 0.75mm Thread Pitch ...
View full detailsPlayer One M54M-M68F Adapter - 17.5mm
Connects M54 Male Threads to M68 Female Threads Adds a Fixed 17.5mm Optical Path Length Machined for Rigidity and Precise Alignment Black Anodized...
View full detailsPlayer One M68 Adapter for FHD-OAG MAX
Connects Player One FHD-OAG MAX to M68x1 Threads M68x1 Female Thread Provides a Secure, Rigid Connection Eliminates Potential Flexure in the Imagi...
View full detailsPlayer One Rear 4P Tilter Plate - R31/R27 Compatible
4-Point tilt adjustment for precise field flattening Connects Player One cooled cameras to filter wheels and drawers Designed for Ares, Uranus PRO...
View full detailsPlayer One Rotolock Adapter - 2"-1.25"
Adapts 2" focusers and diagonals to hold 1.25" accessories Rotolock mechanism provides a secure, self-centering grip Eliminates tilt and wobble co...
View full detailsPlayer One Rotolock Adapter - M42-1.25"
Converts M42x0.75 Female Threads to a 1.25" Holder Rotolock Twist-to-Lock Mechanism Self-Centering Design Eliminates Optical Tilt Prevents Scratch...
View full detailsPlayer One T2-T2 Adapter
M42 x 0.75 Male Threads (Both Sides) Designed for Player One Phoenix Filter Wheels Adds Minimal Optical Path Length Secure, All-Metal Construction...
View full detailsPrimaLuceLab 2" Visual Back for ESATTO 2"
Connects 2" accessories to ESATTO 2" and ARCO 2" M56 female thread for direct attachment Three locking screws for secure, centered grip Internal b...
View full detailsPrimaLuceLab 2" Visual Back for ESATTO 3"
Adapts ESATTO 3" Focuser to Use 2" Accessories Internal Brass Compression Ring Prevents Scratches Multiple Locking Screws for a Secure, Centered F...
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.