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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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Original price CA$14.00 - Original price CA$14.00
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Player One CS-1.25 Adapter

POA-CS125

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...

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Original price CA$14.00 - Original price CA$14.00
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Original price CA$17.00 - Original price CA$17.00
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Player One CS-M42 Adapter

POA-CSM42

Connects CS-Mount Female Threads to M42 Male Threads Adapts Small-Format Cameras to Standard T2 Accessories Enables Use of Filter Wheels and Focal...

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Original price CA$17.00 - Original price CA$17.00
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Original price CA$34.00 - Original price CA$34.00
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Player One M42F-M42M Adapter - 20mm

POA-M42F-M42M-20
2 in stock

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...

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Original price CA$34.00 - Original price CA$34.00
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Original price CA$17.00 - Original price CA$17.00
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Player One M42F-M48M Adapter - 0mm

POA-M42F-M48M-0
1 in stock

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...

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Original price CA$17.00 - Original price CA$17.00
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Original price CA$55.00 - Original price CA$55.00
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Player One M48 Camera Tilter Plate - Third-Party Filter Wheel Adapter

POA-TP90-M48

Adapts Player One cooled cameras to popular third-party filter wheels Features a standard M48x0.75 female thread for secure connection Integrated ...

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Original price CA$55.00 - Original price CA$55.00
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Original price CA$34.00 - Original price CA$34.00
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Player One M48F-M42M Adapter - 17.5mm

POA-M48F-M42M-17.5
1 in stock

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 ...

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Original price CA$34.00 - Original price CA$34.00
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Original price CA$34.00 - Original price CA$34.00
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Player One M48F-M48M Adapter - 20mm

POA-M48F-M48M-20
2 in stock

Adds exactly 20mm of optical length M48x0.75 female (input) and male (output) threads Maintains a rigid connection in the imaging train Standard 2...

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Original price CA$34.00 - Original price CA$34.00
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Original price CA$41.00 - Original price CA$41.00
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Player One M48F-M54M Adapter - 17.5mm

POA-M48F-M54M-17.5

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 ...

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Original price CA$41.00 - Original price CA$41.00
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Original price CA$25.00 - Original price CA$25.00
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Player One M48M-M42M Adapter - 2mm

POA-M48M-M42M-2
2 in stock

Adapts M48x0.75mm Female Threads to M42x0.75mm Female Threads Provides 2mm of Optical Path Length Male Threads on Both Sides (M48M-M42M) Standard ...

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Player One M48M-M48F Adapter - 17.5mm

POA-M48F-M48M-17.5
2 in stock

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...

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Original price CA$34.00 - Original price CA$34.00
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Original price CA$25.00 - Original price CA$25.00
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Player One M48M-M48M Gender Changer Adapter - 2mm

POA-M48M-M48M-2
2 in stock

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...

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Original price CA$25.00 - Original price CA$25.00
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Original price CA$27.00 - Original price CA$27.00
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Player One M54M-M42M Adapter - 2mm

POA-M54M-M42M-2
2 in stock

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:...

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Original price CA$27.00 - Original price CA$27.00
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Player One M54M-M48M Adapter - 2mm

POA-M54M-M48M-2
2 in stock

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...

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Original price CA$27.00 - Original price CA$27.00
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Original price CA$49.00 - Original price CA$49.00
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Player One M54M-M54F Adapter - 17.5mm

POA-M54M-M54F-17.5
1 in stock

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...

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Original price CA$49.00 - Original price CA$49.00
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Original price CA$49.00 - Original price CA$49.00
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Player One M54M-M54F Adapter - 20mm

POA-M54M-M54F-20
1 in stock

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...

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Original price CA$49.00 - Original price CA$49.00
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Original price CA$27.00 - Original price CA$27.00
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Player One M54M-M54M Adapter - 2mm

POA-M54M-M54M-2
2 in stock

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 ...

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Original price CA$27.00 - Original price CA$27.00
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Original price CA$55.00 - Original price CA$55.00
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Player One M54M-M68F Adapter - 17.5mm

POA-M54M-M68F-17.5
1 in stock

Connects M54 Male Threads to M68 Female Threads Adds a Fixed 17.5mm Optical Path Length Machined for Rigidity and Precise Alignment Black Anodized...

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Original price CA$55.00 - Original price CA$55.00
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Original price CA$41.00 - Original price CA$41.00
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Player One M68 Adapter for FHD-OAG MAX

POA-M68-RING
1 in stock

Connects Player One FHD-OAG MAX to M68x1 Threads M68x1 Female Thread Provides a Secure, Rigid Connection Eliminates Potential Flexure in the Imagi...

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Original price CA$41.00 - Original price CA$41.00
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Original price CA$69.00 - Original price CA$69.00
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Player One Rear 4P Tilter Plate - R31/R27 Compatible

POA-TP85-M42

4-Point tilt adjustment for precise field flattening Connects Player One cooled cameras to filter wheels and drawers Designed for Ares, Uranus PRO...

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Original price CA$69.00 - Original price CA$69.00
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Original price CA$49.00 - Original price CA$49.00
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Player One Rotolock Adapter - 2"-1.25"

POA-RL125-2

Adapts 2" focusers and diagonals to hold 1.25" accessories Rotolock mechanism provides a secure, self-centering grip Eliminates tilt and wobble co...

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Original price CA$49.00 - Original price CA$49.00
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Original price CA$55.00 - Original price CA$55.00
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Player One Rotolock Adapter - M42-1.25"

POA-RL125-M42

Converts M42x0.75 Female Threads to a 1.25" Holder Rotolock Twist-to-Lock Mechanism Self-Centering Design Eliminates Optical Tilt Prevents Scratch...

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Original price CA$55.00 - Original price CA$55.00
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Original price CA$17.00 - Original price CA$17.00
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Player One T2-T2 Adapter

POA-T2T2

M42 x 0.75 Male Threads (Both Sides) Designed for Player One Phoenix Filter Wheels Adds Minimal Optical Path Length Secure, All-Metal Construction...

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Original price CA$17.00 - Original price CA$17.00
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Original price CA$119.00 - Original price CA$119.00
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CA$119.00
CA$119.00 - CA$119.00
Current price CA$119.00

PrimaLuceLab 2" Visual Back for ESATTO 2"

PLL-PL8410001

Connects 2" accessories to ESATTO 2" and ARCO 2" M56 female thread for direct attachment Three locking screws for secure, centered grip Internal b...

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Original price CA$119.00 - Original price CA$119.00
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Current price CA$119.00
Original price CA$119.00 - Original price CA$119.00
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CA$119.00 - CA$119.00
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PrimaLuceLab 2" Visual Back for ESATTO 3"

PLL-PL8410002

Adapts ESATTO 3" Focuser to Use 2" Accessories Internal Brass Compression Ring Prevents Scratches Multiple Locking Screws for a Secure, Centered F...

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Original price CA$119.00 - Original price CA$119.00
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Current price CA$119.00

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.