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Focuser Accessories

A focuser upgrade is often unnecessary. What most drawtubes actually need is a compression ring instead of a set screw, a motor bracket to hold focus through the night, or a reduction knob for fine control — small parts that address the specific fault rather than replacing the whole assembly. David Astro carries focuser accessories in Canada, shipping from Canadian stock.

These parts are highly model-specific. Tell us your focuser make and drawtube diameter and we will identify what fits rather than leaving you comparing photographs.

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Pegasus Universal L Bracket

PEG-UNIV-LBRACK

Replacement Universal L Bracket Includes Both Narrow and Wide Bracket Parts Designed for Pegasus Astro Stepper Motor Focusers Ensures Secu...

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$31.65 - $31.65
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Pegasus Universal L Bracket, Couplers, Bolts Kit

PEG-UNIV-KIT
1 in stock

Universal L-bracket for Pegasus Astro focus motors Includes 5 solid motor couplers Fits focuser shafts from 4mm to 8mm Complete kit with assorted ...

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$44.31 - $44.31
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PrimaLuceLab 26mm Adapter for SESTO SENSO 2

PLL-SESTOSENSO-AD26II

Adapts SESTO SENSO 2 for 26mm Focuser Shafts Replaces Standard 25mm Shaft Coupling Designed for Focusers from Explore Scientific and Others Includ...

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PrimaLuceLab 33mm Adapter for SESTO SENSO 2

PLL-SESTOSENSO-AD33II

This 33mm adapter allows you to install SESTO SENSO 2 on focusers that come with a 33mm diameter shaft, like 2,5" and 3" FeatherTouch focusers (or ...

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$76.00 - $76.00
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PrimaLuceLab 37mm Adapter for SESTO SENSO 2

PLL-SESTOSENSO-AD37II

Adapts SESTO SENSO 2 for 37mm diameter focuser shafts Precision-made for focusers like the 3.5" FeatherTouch and Takahashi FSQ-130 Replaces the 2 ...

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$85.00 - $85.00
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PrimaLuceLab 40mm Extension Tube for ESATTO 3"
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PrimaLuceLab 40mm Extension Tube for ESATTO 3"

PLL-PL3600317

Adds 40mm of back focus for ESATTO 3" focusers Enables focus with long-travel telescopes like refractors Precise dovetail coupling system for rigi...

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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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PrimaLuceLab Adapter ESATTO 2" for ARCO 2"

PLL-PL3600412

Connects the ARCO 2" Rotator directly to the ESATTO 2" Focuser Creates a combined rotator thickness of just 21mm Maintains a wide 51mm free apertu...

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$595.00 - $595.00
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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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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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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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$165.00
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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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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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$145.00 - $145.00
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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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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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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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PrimaLuceLab Adapter ESATTO 2" LP and ARCO 2" for telescopes with SC thread
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$95.00
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$95.00

PrimaLuceLab Adapter ESATTO 2" LP and ARCO 2" for telescopes with SC thread

PLL-PL3600542

Connects ESATTO 2" LP Focuser to SC threads Connects ARCO 2" Rotator to SC threads Enables a fully threaded, rigid imaging train Designed for Schm...

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PrimaLuceLab Adapter ESATTO 2" LP for ARCO 2"
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$95.00
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$95.00

PrimaLuceLab Adapter ESATTO 2" LP for ARCO 2"

PLL-PL3600538

Connects the PrimaLuceLab ESATTO 2" LP Focuser to the ARCO 2" Rotator Creates a rigid, unified imaging assembly with a 22mm combined thickness Mai...

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$95.00 - $95.00
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PrimaLuceLab Adapter ESATTO 2” LP for telescopes with large 3.3" SC thread
$95.00 - $95.00
$95.00
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$95.00

PrimaLuceLab Adapter ESATTO 2” LP for telescopes with large 3.3" SC thread

PLL-PL3600539

Connects ESATTO 2” LP to telescopes with a large 3.3" SC thread Designed for Celestron SCT (11" and 14") and EdgeHD (9.25", 11", and 14") models E...

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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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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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$195.00
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$195.00

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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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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$295.00 - $295.00
$295.00
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$295.00

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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$295.00 - $295.00
$295.00
$295.00 - $295.00
$295.00

Small Parts That Fix Real Focuser Problems

Each item here corresponds to a symptom. Matching the part to the symptom is quicker and cheaper than a replacement focuser.

  • Compression rings: Replace a single set screw with even radial clamping. This stops the barrel marking and, more importantly, removes the tilt a point-contact screw induces in an imaging train.
  • Motor brackets and couplers: Attach a stepper motor to an existing fine-focus shaft, adding absolute positioning and autofocus without replacing the drawtube.
  • Reduction knobs and dual-speed retrofits: Add 10:1 fine focus to a single-speed focuser, which matters most at fast focal ratios where the critical focus zone is very narrow.
  • Drawtube tension and locking hardware: Adjust or restore the friction that stops a Crayford slipping under a heavy camera train at steep angles.
  • Rotation collars: Rotate the camera for framing without unthreading the imaging train and losing your spacing.
  • Extension tubes and terminations: Reach focus with accessories that would otherwise fall inside the drawtube's travel range, and convert the output to standard imaging threads.

Why Choose David Astro for Focuser Accessories

Diagnosing the fault correctly is worth more than the part itself.

  • Symptom-based advice: Tell us what is happening — slipping, drifting focus, marked barrels, one-sided stars — and we will tell you which part addresses it rather than selling an upgrade you may not need.
  • Model-specific fitting: Motor brackets and reduction retrofits are made for particular focusers, and we confirm the match before shipping.
  • Tilt awareness: We treat set-screw induced tilt as a real optical problem, because at fast focal ratios it produces star elongation that looks like a corrector spacing error.
  • Authorized dealer: Genuine parts with full manufacturer warranty, in stock, with fast shipping across Canada and worldwide.
  • Ships from Canada: Domestic delivery with no duties or brokerage fees for Canadian buyers.

Focuser Accessories in Canada — Frequently Asked Questions

Will a compression ring really improve my images?
If you are using a single set screw on a heavy camera train, very likely. Point contact tilts the barrel by a fraction of a degree, which at f/5 is enough to elongate stars on one side of the field.
Can I motorize any focuser?
Most focusers with an exposed fine-focus shaft can take a bracket-mounted motor. Tell us the focuser model and we will confirm whether a bracket exists or whether replacement is the better route.
Why does my focuser slip near zenith?
Crayford focusers rely on friction, and the load direction changes as the tube tilts. Adjusting drawtube tension often fixes it; if not, the train has exceeded what the mechanism can hold and a rack-and-pinion is the answer.
Do you carry parts for older focusers?
Often. Many manufacturers supply service parts to dealers that are not listed publicly. Send us the model and we will check availability.

Diagnosing a focuser problem?

Describe the symptom and we will identify the part that fixes it. Canadian stock, fast domestic shipping.