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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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PrimaLuceLab 3" Nosepiece for ARCO 3" Rotator
CA$91.00 - CA$91.00
CA$91.00
CA$91.00 - CA$91.00
CA$91.00

PrimaLuceLab 3" Nosepiece for ARCO 3" Rotator

PLL-PL3600466

Connects ARCO 3" rotator to any standard 3" focuser visual back Enables a rigid, secure connection for your imaging train Designed for integration...

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CA$91.00 - CA$91.00
CA$91.00
CA$91.00 - CA$91.00
CA$91.00
CA$41.00 - CA$41.00
CA$41.00
CA$41.00 - CA$41.00
CA$41.00

PrimaLuceLab 5mm M48 Extension

PLL-PL3304805
1 in stock

Adds a precise 5mm of optical length Standard M48x0.75 male and female threads Knurled exterior for a secure grip Black-anodized aluminum construc...

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CA$41.00 - CA$41.00
CA$41.00
CA$41.00 - CA$41.00
CA$41.00
CA$27.00 - CA$27.00
CA$27.00
CA$27.00 - CA$27.00
CA$27.00

PrimaLuceLab 5mm T2 Extension

PLL-PL3304205
1 in stock

Provides a fixed 5mm of optical path extension Standard T2 male and female threads (M42x0.75) Black anodized aluminum construction Knurled exterio...

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CA$27.00 - CA$27.00
CA$27.00
CA$27.00 - CA$27.00
CA$27.00
CA$175.00 - CA$175.00
CA$175.00
CA$175.00 - CA$175.00
CA$175.00

PrimaLuceLab 65mm Extension Tube for ESATTO 3"

PLL-PL3600284

Adds 65mm of extension for ESATTO 3" focusers Enables focus on telescopes with long-travel stock focusers Integrated dovetail coupling system for ...

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CA$175.00 - CA$175.00
CA$175.00
CA$175.00 - CA$175.00
CA$175.00
CA$41.00 - CA$41.00
CA$41.00
CA$41.00 - CA$41.00
CA$41.00

PrimaLuceLab 7mm M48 Extension

PLL-PL3304807
1 in stock

Provides a fixed 7mm optical path extension Standard M48x0.75 male and female threads Black anodized aluminum construction minimizes reflections E...

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CA$41.00 - CA$41.00
CA$41.00
CA$41.00 - CA$41.00
CA$41.00
CA$27.00 - CA$27.00
CA$27.00
CA$27.00 - CA$27.00
CA$27.00

PrimaLuceLab 7mm T2 Extension

PLL-PL3304207
1 in stock

Provides 7mm of fixed optical spacing Standard T2 (M42x0.75) male and female threads Knurled exterior for a secure grip, even with gloves Black an...

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CA$27.00 - CA$27.00
CA$27.00
CA$27.00 - CA$27.00
CA$27.00
CA$41.00 - CA$41.00
CA$41.00
CA$41.00 - CA$41.00
CA$41.00

PrimaLuceLab 9mm M48 Extension

PLL-PL3304809
1 in stock

Provides a fixed 9mm of optical path extension Standard M48x0.75 male and female threads Black anodized aluminum construction minimizes reflection...

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CA$41.00 - CA$41.00
CA$41.00
CA$41.00 - CA$41.00
CA$41.00
CA$34.00 - CA$34.00
CA$34.00
CA$34.00 - CA$34.00
CA$34.00

PrimaLuceLab 9mm T2 Extension

PLL-PL3304209
1 in stock

Provides 9mm of fixed spacing T2 threads (male on one side, female on the other) Black anodized metal construction Knurled exterior for a secure g...

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CA$34.00 - CA$34.00
CA$34.00
CA$34.00 - CA$34.00
CA$34.00
CA$833.00 - CA$833.00
CA$833.00
CA$833.00 - CA$833.00
CA$833.00

PrimaLuceLab Adapter ESATTO 2" for Borg 55FL f3.6

PLL-PL3600248

Connects ESATTO 2" Focuser to Borg 55FL f/3.6 Telescope Creates a Secure, Direct-Threaded Connection Eliminates Potential for Tilt and Flexure in ...

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CA$833.00 - CA$833.00
CA$833.00
CA$833.00 - CA$833.00
CA$833.00
CA$111.00 - CA$111.00
CA$111.00
CA$111.00 - CA$111.00
CA$111.00

PrimaLuceLab Adapter ESATTO 2" for GSO/Orion/TPO Ritchey-Chretien 6 and 8"

PLL-PL3600235

Connects ESATTO 2" Robotic Focuser to select Ritchey-Chretien telescopes Compatible with GSO, Orion, and TPO 6" (152mm) and 8" (203mm) RC models E...

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CA$111.00 - CA$111.00
CA$111.00
CA$111.00 - CA$111.00
CA$111.00
CA$203.00 - CA$203.00
CA$203.00
CA$203.00 - CA$203.00
CA$203.00

PrimaLuceLab Adapter ESATTO 2" for Sky-Watcher/Orion ED80, ED100 and ED120

PLL-PL3600230

Connects ESATTO 2" Focuser to select refractors Compatible with Sky-Watcher/Orion ED80 Apochromatic Refractors Compatible with Sky-Watcher/Orion E...

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CA$203.00 - CA$203.00
CA$203.00
CA$203.00 - CA$203.00
CA$203.00
CA$231.00 - CA$231.00
CA$231.00
CA$231.00 - CA$231.00
CA$231.00

PrimaLuceLab Adapter ESATTO 2" for Sky-Watcher/Orion Newton 200 f4 and f5

PLL-PL3600229

Connects ESATTO 2" focusers to Sky-Watcher/Orion 200mm f/4 and f/5 Newtonians Maintains original focuser thickness to ensure prime focus is reacha...

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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 2" for Sky-Watcher/Orion Newton 250 f4 and f5

PLL-PL3600237

Enables installation of the ESATTO 2" motorized focuser Designed specifically for Sky-Watcher/Orion Newton 250 f/4 and f/5 telescopes Maintains th...

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CA$231.00 - CA$231.00
CA$231.00
CA$231.00 - CA$231.00
CA$231.00
CA$203.00 - CA$203.00
CA$203.00
CA$203.00 - CA$203.00
CA$203.00

PrimaLuceLab Adapter ESATTO 2" for Takahashi FS-60Q

PLL-PL3600255

Connects PrimaLuceLab ESATTO 2" Focuser to Takahashi FS-60Q Telescopes Adds Only 5mm of Optical Thickness to the Imaging Train Enables High-Precis...

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CA$203.00 - CA$203.00
CA$203.00
CA$203.00 - CA$203.00
CA$203.00
CA$91.00 - CA$91.00
CA$91.00
CA$91.00 - CA$91.00
CA$91.00

PrimaLuceLab Adapter ESATTO 2" for Telescopes with Large 3.3" SC Thread

PLL-PL3600212

Connects ESATTO 2" focuser to large 3.3" SC threads Designed for Celestron 9.25", 11", and 14" SCT & EdgeHD telescopes Ultra-thin 2mm optical ...

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CA$91.00 - CA$91.00
CA$91.00
CA$91.00 - CA$91.00
CA$91.00
CA$49.00 - CA$49.00
CA$49.00
CA$49.00 - CA$49.00
CA$49.00

PrimaLuceLab Adapter ESATTO 2" for Telescopes with SC Thread

PLL-PL3600209

Connects ESATTO 2" Motorized Focuser to SC Telescope Threads Adds 0mm of Optical Thickness to the Imaging Train Compatible with Celestron SCT and ...

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CA$49.00 - CA$49.00
CA$49.00
CA$49.00 - CA$49.00
CA$49.00
CA$97.00 - CA$97.00
CA$97.00
CA$97.00 - CA$97.00
CA$97.00

PrimaLuceLab Adapter ESATTO 3" for ARCO 2"

PLL-PL3600416

Connects ARCO 2" Rotator to ESATTO 3" Focuser Enables Direct Power and Control via ESATTO Port Creates a Rigid, Mechanically Coupled Imaging Train...

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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 ESATTO 3" for ARCO 3"

PLL-PL3600458

Connects ESATTO 3" Focuser to ARCO 3" Rotator Enables Electronic Control via ESATTO Port Results in a Combined Rotator Thickness of 24.5mm Maintai...

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

PrimaLuceLab Adapter ESATTO 3" for Borg 90FL and 107FL f3.9

PLL-PL3600268

Connects ESATTO 3" robotic focuser to Borg 90FL telescopes Connects ESATTO 3" robotic focuser to Borg 107FL f/3.9 telescopes Replaces the original...

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CA$273.00 - CA$273.00
CA$273.00
CA$273.00 - CA$273.00
CA$273.00
CA$175.00 - CA$175.00
CA$175.00
CA$175.00 - CA$175.00
CA$175.00

PrimaLuceLab Adapter ESATTO 3" for GSO/Orion/TPO Ritchey-Chretien 10, 12, 14 and 16"

PLL-PL3600236

Connects ESATTO 3" Focuser For 10", 12", 14", and 16" RC Telescopes Compatible with GSO, Orion, and TPO Models Provides a Rigid, Thread-On Connect...

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CA$175.00 - CA$175.00
CA$175.00
CA$175.00 - CA$175.00
CA$175.00
CA$413.00 - CA$413.00
CA$413.00
CA$413.00 - CA$413.00
CA$413.00

PrimaLuceLab Adapter ESATTO 3" for Meade 16" with 4" Thread

PLL-PL3600292

Connects ESATTO 3" focuser to Meade 16" telescopes Designed for the standard 4" rear cell thread Enables robotic focusing for heavy imaging payloa...

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CA$413.00 - CA$413.00
CA$413.00
CA$413.00 - CA$413.00
CA$413.00
CA$357.00 - CA$357.00
CA$357.00
CA$357.00 - CA$357.00
CA$357.00

PrimaLuceLab Adapter ESATTO 3" for Sky-Watcher ESPRIT 100 ED

PLL-PL3600288

Precision-engineered for the PrimaLuceLab ESATTO 3" robotic focuser Designed for a perfect fit on the Sky-Watcher ESPRIT 100 ED telescope Provides...

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CA$357.00 - CA$357.00
CA$357.00
CA$357.00 - CA$357.00
CA$357.00
CA$357.00 - CA$357.00
CA$357.00
CA$357.00 - CA$357.00
CA$357.00

PrimaLuceLab Adapter ESATTO 3" for Sky-Watcher ESPRIT 120 ED and 150 ED

PLL-PL3600253

Directly connects the ESATTO 3" robotic focuser to specific telescopes Compatible with Sky-Watcher ESPRIT 120 ED and 150 ED models Enables precise...

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CA$357.00 - CA$357.00
CA$357.00
CA$357.00 - CA$357.00
CA$357.00
CA$133.00 - CA$133.00
CA$133.00
CA$133.00 - CA$133.00
CA$133.00

PrimaLuceLab Adapter ESATTO 3" for Takahashi FSQ85

PLL-PL3600271

Connects ESATTO 3" focuser to Takahashi FSQ85 telescopes Provides a solid, direct-thread mechanical interface Enables high-payload, precision moto...

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

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.