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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.

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CA$161.00 - CA$161.00
CA$161.00
CA$161.00 - CA$161.00
CA$161.00

PrimaLuceLab Adapter ESATTO 3" for Takahashi Telescopes with M72 Thread

PLL-PL3600245

Connects ESATTO 3" motorized focusers to Takahashi telescopes Designed for OTAs with a rear M72x1 female thread Low-profile design minimizes added...

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CA$161.00 - CA$161.00
CA$161.00
CA$161.00 - CA$161.00
CA$161.00
CA$413.00 - CA$413.00
CA$413.00
CA$413.00 - CA$413.00
CA$413.00

PrimaLuceLab Adapter ESATTO 3" for Takahashi TSA 120

PLL-PL3600296

Connects ESATTO 3" Focuser to Takahashi TSA-120 Telescopes Enables High-Precision, Motorized Focusing Provides a Secure, Direct Mechanical Connect...

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CA$413.00 - CA$413.00
CA$413.00
CA$413.00 - CA$413.00
CA$413.00
CA$329.00 - CA$329.00
CA$329.00
CA$329.00 - CA$329.00
CA$329.00

PrimaLuceLab Adapter ESATTO 4" for Officina Stellare ProRC, RiDK, RiFAst

PLL-PL3600326

Connects ESATTO 4" focusers to select Officina Stellare telescopes Designed for ProRC, RiDK, and RiFAst models Ensures a rigid, direct-thread atta...

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CA$329.00 - CA$329.00
CA$329.00
CA$329.00 - CA$329.00
CA$329.00
CA$231.00 - CA$231.00
CA$231.00
CA$231.00 - CA$231.00
CA$231.00

PrimaLuceLab Adapter ESATTO 4" for Takahashi FSQ-106

PLL-PL3600310

Installs the PrimaLuceLab ESATTO 4" focuser on a Takahashi FSQ-106 telescope Engineered to match the original focuser's thickness to maintain focu...

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CA$231.00 - CA$231.00
CA$231.00
CA$231.00 - CA$231.00
CA$231.00
CA$231.00 - CA$231.00
CA$231.00
CA$231.00 - CA$231.00
CA$231.00

PrimaLuceLab Adapter ESATTO 4" for Takahashi FSQ-106EDXIV

PLL-PL3600324

Connects ESATTO 4" Focuser to Takahashi FSQ-106EDXIV & FSQ-106EDX3 Provides 35mm of Optical Thickness Replicates the Original 100.5mm Focuser ...

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CA$231.00 - CA$231.00
CA$231.00
CA$231.00 - CA$231.00
CA$231.00
CA$273.00 - CA$273.00
CA$273.00
CA$273.00 - CA$273.00
CA$273.00

PrimaLuceLab Adapter from M110 to M68 with Stop Ring for ESATTO 4"

PLL-PL3600312

Connects M68x1 threaded accessories to the ESATTO 4" focuser Features an independent stop ring for precise rotational framing Threads directly ont...

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CA$273.00 - CA$273.00
CA$273.00
CA$273.00 - CA$273.00
CA$273.00
CA$217.00 - CA$217.00
CA$217.00
CA$217.00 - CA$217.00
CA$217.00

PrimaLuceLab Adapter from M110 to M92 Female for ESATTO 4"

PLL-PL3600316

Converts ESATTO 4" M110x1 Male Thread to a Takahashi-standard M92x1 Female Thread Enables Direct Connection of Takahashi Photographic Adapters, Re...

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CA$217.00 - CA$217.00
CA$217.00
CA$217.00 - CA$217.00
CA$217.00
CA$217.00 - CA$217.00
CA$217.00
CA$217.00 - CA$217.00
CA$217.00

PrimaLuceLab Adapter from M110 to M95 Female for ESATTO 4"

PLL-PL3600319

Converts the ESATTO 4" focuser's M110x1 male thread to an M95x1 female thread Designed specifically for the PrimaLuceLab ESATTO 4" Robotic Focuser...

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CA$217.00 - CA$217.00
CA$217.00
CA$217.00 - CA$217.00
CA$217.00
CA$273.00 - CA$273.00
CA$273.00
CA$273.00 - CA$273.00
CA$273.00

PrimaLuceLab Adapter from M110 to M98 with Stop Ring for ESATTO 4"

PLL-PL3600322

Connects accessories to the PrimaLuceLab ESATTO 4" Focuser Includes an independent stop ring for rotational adjustment Enables precise framing of ...

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CA$273.00 - CA$273.00
CA$273.00
CA$273.00 - CA$273.00
CA$273.00
CA$133.00 - CA$133.00
CA$133.00
CA$133.00 - CA$133.00
CA$133.00

PrimaLuceLab Adapter from M56 to M48 with Stop Ring for ESATTO 2"

PLL-PL3600216

Connects M48x0.75 accessories to ESATTO 2" focusers Adds only 4mm of optical path length Includes a stop ring for precise camera rotation Threads ...

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CA$133.00 - CA$133.00
CA$133.00
CA$133.00 - CA$133.00
CA$133.00
CA$133.00 - CA$133.00
CA$133.00
CA$133.00 - CA$133.00
CA$133.00

PrimaLuceLab Adapter from M56 to M54 with Stop Ring for ESATTO 2"

PLL-PL3600242

Connects accessories with M54x0.75 female threads to the ESATTO 2" focuser Threads directly onto the ESATTO 2" M56 draw tube Integrated stop ring ...

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CA$133.00 - CA$133.00
CA$133.00
CA$133.00 - CA$133.00
CA$133.00
CA$133.00 - CA$133.00
CA$133.00
CA$133.00 - CA$133.00
CA$133.00

PrimaLuceLab Adapter from M56 to M57 with Stop Ring for ESATTO 2"

PLL-PL3600227

Adapts ESATTO 2" M56 Male Thread to M57 Female Thread Connects M57x0.75 Threaded Cameras and Accessories Integrated Stop Ring for Precise Rotation...

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CA$133.00 - CA$133.00
CA$133.00
CA$133.00 - CA$133.00
CA$133.00
CA$175.00 - CA$175.00
CA$175.00
CA$175.00 - CA$175.00
CA$175.00

PrimaLuceLab Adapter from M56 to SC with Stop Ring for ESATTO 2"

PLL-PL3600225

Adapts the ESATTO 2" focuser's M56 thread to a standard female SC thread Enables direct connection of Schmidt-Cassegrain focal reducers and access...

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CA$175.00 - CA$175.00
CA$175.00
CA$175.00 - CA$175.00
CA$175.00
CA$133.00 - CA$133.00
CA$133.00
CA$133.00 - CA$133.00
CA$133.00

PrimaLuceLab Adapter from M56 to T2 with Stop Ring for ESATTO 2"

PLL-PL3600218
1 in stock

Adapts the ESATTO 2" M56 female thread to a standard T2 (M42x0.75) male thread Designed specifically for the PrimaLuceLab ESATTO 2" robotic focuse...

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CA$133.00 - CA$133.00
CA$133.00
CA$133.00 - CA$133.00
CA$133.00
CA$133.00 - CA$133.00
CA$133.00
CA$133.00 - CA$133.00
CA$133.00

PrimaLuceLab Adapter from M81 to M48 with Stop Ring for ESATTO 3"

PLL-PL3600277

Adapts the M81 female thread of the ESATTO 3" focuser to a male M48x0.75 thread Allows direct connection of cameras, filter wheels, and off-axis g...

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CA$133.00 - CA$133.00
CA$133.00
CA$133.00 - CA$133.00
CA$133.00
CA$133.00 - CA$133.00
CA$133.00
CA$133.00 - CA$133.00
CA$133.00

PrimaLuceLab Adapter from M81 to M54 with Stop Ring for ESATTO 3"

PLL-PL3600275

Connects M81 Threads to M54 Accessories Adds a Minimal 4mm of Optical Path Includes Stop Ring for Rotational Adjustment Compatible with ESATTO 3" ...

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CA$133.00 - CA$133.00
CA$133.00
CA$133.00 - CA$133.00
CA$133.00
CA$133.00 - CA$133.00
CA$133.00
CA$133.00 - CA$133.00
CA$133.00

PrimaLuceLab Adapter from M81 to M57 with Stop Ring for ESATTO 3"

PLL-PL3600279

Connects M57 accessories to M81 threads Compatible with ESATTO 3" and ARCO 3" Adds only 4mm of optical length Includes a stop ring for precise 360...

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CA$133.00 - CA$133.00
CA$133.00
CA$133.00 - CA$133.00
CA$133.00
CA$119.00 - CA$119.00
CA$119.00
CA$119.00 - CA$119.00
CA$119.00

PrimaLuceLab Adapter from M81 to M68 Female for ESATTO 3"

PLL-PL3600289

Connects M68x1 Male Threaded Accessories Attaches to M81 Female Thread on Focuser/Rotator Compatible with ESATTO 3" Focuser Compatible with ARCO 3...

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CA$119.00 - CA$119.00
CA$119.00
CA$119.00 - CA$119.00
CA$119.00
CA$133.00 - CA$133.00
CA$133.00
CA$133.00 - CA$133.00
CA$133.00

PrimaLuceLab Adapter from M81 to M68 with Stop Ring for ESATTO 3"

PLL-PL3600262

Connects M68x1 threaded accessories to M81x1 threaded focusers Designed for the PrimaLuceLab ESATTO 3" and ARCO 3" systems Adds a minimal 4mm of o...

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CA$133.00 - CA$133.00
CA$133.00
CA$133.00 - CA$133.00
CA$133.00
CA$97.00 - CA$97.00
CA$97.00
CA$97.00 - CA$97.00
CA$97.00

PrimaLuceLab Adapter from M81 to M72 Female for ESATTO 3"

PLL-PL3600252

Connects M72 male threads to M81 female threads Designed for PrimaLuceLab ESATTO 3" robotic focusers Compatible with PrimaLuceLab ARCO 3" robotic ...

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CA$97.00 - CA$97.00
CA$97.00
CA$97.00 - CA$97.00
CA$97.00
CA$133.00 - CA$133.00
CA$133.00
CA$133.00 - CA$133.00
CA$133.00

PrimaLuceLab Adapter from M81 to M72 with Stop Ring for ESATTO 3"

PLL-PL3600272

Adapts M81 male threads to M72 female threads Designed for PrimaLuceLab ESATTO 3" focusers and ARCO 3" rotators Adds a minimal 4mm of total optica...

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CA$133.00 - CA$133.00
CA$133.00
CA$133.00 - CA$133.00
CA$133.00
CA$133.00 - CA$133.00
CA$133.00
CA$133.00 - CA$133.00
CA$133.00

PrimaLuceLab Adapter from M81 to T2 with Stop Ring for ESATTO 3"

PLL-PL3600282

Adapts the M81 male thread of ESATTO 3" or ARCO 3" systems to a standard T2 (M42x0.75) female thread Enables direct connection of T2-threaded came...

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CA$133.00 - CA$133.00
CA$133.00
CA$133.00 - CA$133.00
CA$133.00
PrimaLuceLab ALTO-3L adapter for OS RiDK 400
CA$693.00 - CA$693.00
CA$693.00
CA$693.00 - CA$693.00
CA$693.00

PrimaLuceLab ALTO-3L adapter for OS RiDK 400

PLL-PL3700141

Connects ALTO-3L motor to the OS RiDK 400 telescope Enables remote control of GIOTTO 560 flat field generator Provides a secure, model-specific me...

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CA$693.00 - CA$693.00
CA$693.00
CA$693.00 - CA$693.00
CA$693.00
CA$31.00 - CA$31.00
CA$31.00
CA$31.00 - CA$31.00
CA$31.00

PrimaLuceLab M48 Female to T2 Male Adapter

PLL-PL3304842
2 in stock

Connects female M48x0.75 threads to male T2 (M42x0.75) threads Solves common thread mismatches in imaging trains Durable, all-metal construction f...

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CA$31.00 - CA$31.00
CA$31.00
CA$31.00 - CA$31.00
CA$31.00

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.