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Focusers

At f/4, the critical focus zone is a few tens of microns. A metal telescope tube contracting through a fifteen-degree Canadian night will move focus well outside that on its own, which is why motorized, temperature-compensated focus stopped being a luxury for imagers. David Astro carries focusers in Canada — manual dual-speed, stepper-driven and fully robotic — in Canadian inventory and shipped domestically.

Fit and load capacity are the two decisions that matter. Tell us your telescope and the weight of your camera train and we will specify the focuser and the mounting adapter together.

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CA$1,225.00 - CA$1,225.00
CA$1,225.00
CA$1,225.00 - CA$1,225.00
CA$1,225.00

PrimaLuceLab ESATTO 2" LP Low Profile Robotic Focuser

PLLEST2LP

32mm low-profile thickness 50.9mm clear aperture 10mm of precise focuser travel 0.03 microns per step resolution 5kg payload capacity Descripti...

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CA$1,225.00 - CA$1,225.00
CA$1,225.00
CA$1,225.00 - CA$1,225.00
CA$1,225.00
CA$945.00 - CA$945.00
CA$945.00
CA$945.00 - CA$945.00
CA$945.00

PrimaLuceLab ESATTO 2" Robotic microFocuser

PLL-PLLEST2

Robotic microfocuser with integrated motor and controller Low-profile body ideal for systems with limited backfocus Supports heavy astrophotograph...

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CA$945.00 - CA$945.00
CA$945.00
CA$945.00 - CA$945.00
CA$945.00
PrimaLuceLab ESATTO 3" Focuser with ARCO 3" Rotator
CA$3,269.00 - CA$3,269.00
CA$3,269.00
CA$3,269.00 - CA$3,269.00
CA$3,269.00

PrimaLuceLab ESATTO 3" Focuser with ARCO 3" Rotator

PLLEST3ARCO3

Integrated 3" Robotic Focuser and Rotator Bundle 76.3mm Clear Aperture Through Entire Optical Path 86.5mm Combined Thickness ESATTO Focuser: 8kg P...

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CA$3,269.00 - CA$3,269.00
CA$3,269.00
CA$3,269.00 - CA$3,269.00
CA$3,269.00
CA$1,323.00 - CA$1,323.00
CA$1,323.00
CA$1,323.00 - CA$1,323.00
CA$1,323.00

PrimaLuceLab ESATTO 3" Robotic microFocuser

PLL-PLLEST3

76.3mm Clear Aperture 8 kg Payload Capacity 25mm Draw Tube Travel 0.04 Micron per Step Resolution ASCOM, WiFi, and USB-C Control Description FA...

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CA$1,323.00 - CA$1,323.00
CA$1,323.00
CA$1,323.00 - CA$1,323.00
CA$1,323.00
PrimaLuceLab ESATTO 3,5" LP Focuser with ARCO 3" Rotator
CA$3,619.00 - CA$3,619.00
CA$3,619.00
CA$3,619.00 - CA$3,619.00
CA$3,619.00

PrimaLuceLab ESATTO 3,5" LP Focuser with ARCO 3" Rotator

PLLEST35LPARCO3

Combined ESATTO 3,5" Focuser and ARCO 3" Rotator Low-Profile Design for Complex Imaging Trains Integrated Power and Data Reduces Cable Drag Functi...

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CA$3,619.00 - CA$3,619.00
CA$3,619.00
CA$3,619.00 - CA$3,619.00
CA$3,619.00
CA$1,673.00 - CA$1,673.00
CA$1,673.00
CA$1,673.00 - CA$1,673.00
CA$1,673.00

PrimaLuceLab ESATTO 3.5" LP Robotic Focuser

PLL-PLLEST35LP

Low-profile robotic focuser designed for astrographs High payload capacity for heavy imaging trains WiFi and USB-C for complete remote control Ded...

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CA$1,673.00 - CA$1,673.00
CA$1,673.00
CA$1,673.00 - CA$1,673.00
CA$1,673.00
CA$4,109.00 - CA$4,109.00
CA$4,109.00
CA$4,109.00 - CA$4,109.00
CA$4,109.00

PrimaLuceLab ESATTO 4" Focuser with ARCO 3" rotator

PLL-PLLEST4ARCO3

Robotic focuser and high-resolution rotator bundle Engineered for large, observatory-class telescopes and astrographs High payload capacity to sup...

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CA$4,109.00 - CA$4,109.00
CA$4,109.00
CA$4,109.00 - CA$4,109.00
CA$4,109.00
CA$1,953.00 - CA$1,953.00
CA$1,953.00
CA$1,953.00 - CA$1,953.00
CA$1,953.00

PrimaLuceLab ESATTO 4" Robotic microFocuser

PLL-PLLEST4

102.2mm clear aperture 10 kg payload capacity 35mm of draw tube travel 0.04 micron resolution per step USB-C, WiFi, and ARCO port connectivity ...

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CA$1,953.00 - CA$1,953.00
CA$1,953.00
CA$1,953.00 - CA$1,953.00
CA$1,953.00
PrimaLuceLab SESTO SENSO 3 LS Robotic Focusing Motor for Telephoto Lenses
CA$489.00 - CA$489.00
CA$489.00
CA$489.00 - CA$489.00
CA$489.00

PrimaLuceLab SESTO SENSO 3 LS Robotic Focusing Motor for Telephoto Lenses

PLL-SESTOSENSO3LS

Robotic focusing motor designed for telephoto lenses Lens Gear Clamp (LGC) for direct, backlash-free connection Integrated position encoder allows...

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CA$489.00 - CA$489.00
CA$489.00
CA$489.00 - CA$489.00
CA$489.00
PrimaLuceLab SESTO SENSO 3 Robotic Focusing Motor
CA$391.00 - CA$391.00
CA$391.00
CA$391.00 - CA$391.00
CA$391.00

PrimaLuceLab SESTO SENSO 3 Robotic Focusing Motor

PLL-SESTOSENSO3
2 in stock

Advanced robotic focusing motor for Crayford or rack-and-pinion focusers Integrated position encoder allows manual adjustment without losing calib...

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CA$391.00 - CA$391.00
CA$391.00
CA$391.00 - CA$391.00
CA$391.00
PrimaLuceLab SESTO SENSO 3 SC Robotic Focusing Motor
CA$419.00 - CA$419.00
CA$419.00
CA$419.00 - CA$419.00
CA$419.00

PrimaLuceLab SESTO SENSO 3 SC Robotic Focusing Motor

PLL-SESTOSENSO3SC

Robotic focusing motor for SC, EdgeHD, and RASA telescopes Direct Pulley Clamp (DPC) for backlash-free, slip-free connection Integrated encoder al...

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CA$419.00 - CA$419.00
CA$419.00
CA$419.00 - CA$419.00
CA$419.00
CA$280.00 - CA$280.00
CA$280.00
CA$280.00 - CA$280.00
CA$280.00

Starlight Instruments 1.25" Dual Speed Pinion Assembly Upgrade

SI-FTF1575PA-DS

Adds dual-speed fine focusing to existing 1.25" single-speed focusers Precision planetary reduction mechanism for smooth, backlash-free control Co...

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CA$280.00 - CA$280.00
CA$280.00
CA$280.00 - CA$280.00
CA$280.00
CA$854.00 - CA$896.00
CA$854.00 - CA$896.00
CA$854.00 - CA$896.00
CA$854.00

Starlight Instruments Feather Touch 2.5" R&P Focuser

Options available

2.5" Diameter Helical Rack and Pinion Focuser 13-15 Pound Lifting Capacity for Heavy Imaging Trains 10:1 Dual-Speed Fine Focus Reduction 360-Degre...

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CA$854.00 - CA$896.00
CA$854.00 - CA$896.00
CA$854.00 - CA$896.00
CA$854.00
CA$882.00 - CA$924.00
CA$882.00 - CA$924.00
CA$882.00 - CA$924.00
CA$882.00

Starlight Instruments Feather Touch 3.0" R&P Focuser

Options available

3.0" Diameter Helical Rack & Pinion Focuser 13-15 pound lifting capacity for heavy imaging trains 10:1 dual-speed reduction for precise fine f...

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CA$882.00 - CA$924.00
CA$882.00 - CA$924.00
CA$882.00 - CA$924.00
CA$882.00
CA$1,344.00 - CA$1,372.00
CA$1,344.00 - CA$1,372.00
CA$1,344.00 - CA$1,372.00
CA$1,344.00

Starlight Instruments Feather Touch 3.5" R&P Focuser

Options available

3.5-inch rack and pinion focuser for large telescopes Supports heavy imaging payloads of 18-20 pounds Dual-speed 10:1 reduction ratio for precise ...

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CA$1,344.00 - CA$1,372.00
CA$1,344.00 - CA$1,372.00
CA$1,344.00 - CA$1,372.00
CA$1,344.00
CA$1,764.00 - CA$1,764.00
CA$1,764.00
CA$1,764.00 - CA$1,764.00
CA$1,764.00

Starlight Instruments Feather Touch 3.5" R&P Focuser Kit for FSQ-106

SI-FTF3515-TAK FSQ106ED

Custom designed for the Takahashi FSQ-106ED telescope Robust 18-20 pound lifting capacity supports heavy imaging trains Precise 10:1 dual-speed re...

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CA$1,764.00 - CA$1,764.00
CA$1,764.00
CA$1,764.00 - CA$1,764.00
CA$1,764.00
CA$1,743.00 - CA$1,785.00
CA$1,743.00 - CA$1,785.00
CA$1,743.00 - CA$1,785.00
CA$1,743.00

Starlight Instruments Feather Touch Gen II 3.0" Motorized R&P Focuser

Options available

Lifts imaging trains up to 56 lb with zero slip Achieves 0.23 micron resolution per step for critical focus Integrated Posi Drive Motor System (PD...

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CA$1,743.00 - CA$1,785.00
CA$1,743.00 - CA$1,785.00
CA$1,743.00 - CA$1,785.00
CA$1,743.00
CA$490.00 - CA$490.00
CA$490.00
CA$490.00 - CA$490.00
CA$490.00

Starlight Instruments Feather Touch Micro Focuser for Celestron 6" Evolution

SI-FTM-C6 Evolution

Replaces stock focuser on Celestron 6" Evolution & select 6SE SCTs Dual-speed mechanism for precise fine-focus adjustments Eliminates primary ...

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CA$490.00 - CA$490.00
CA$490.00
CA$490.00 - CA$490.00
CA$490.00
CA$518.00 - CA$518.00
CA$518.00
CA$518.00 - CA$518.00
CA$518.00

Starlight Instruments Feather Touch Micro Focuser for Celestron C14 SCT

SI-FTM-C14

Installs directly onto Celestron C-14 SCTs Provides dual-speed (coarse and fine) focusing Eliminates image shift caused by stock focuser Enables p...

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CA$518.00 - CA$518.00
CA$518.00
CA$518.00 - CA$518.00
CA$518.00
CA$504.00 - CA$504.00
CA$504.00
CA$504.00 - CA$504.00
CA$504.00

Starlight Instruments Feather Touch Micro Focuser for Celestron C9.25 SCT

SI-FTM-C9.25

Direct focuser upgrade for Celestron C9.25 SCT telescopes Provides 10:1 dual-speed fine focus control Eliminates image shift and "mirror flop" fro...

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CA$504.00 - CA$504.00
CA$504.00
CA$504.00 - CA$504.00
CA$504.00
CA$490.00 - CA$490.00
CA$490.00
CA$490.00 - CA$490.00
CA$490.00

Starlight Instruments Feather Touch Micro Focuser for Celestron CPC11, C11 Edge HD, RASA 11" SCT

SI-FTM-CPC11

Replaces stock focuser on Celestron 11" SCTs True dual-speed 10:1 fine focus mechanism Eliminates image shift and mirror flop Installs easily with...

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CA$490.00 - CA$490.00
CA$490.00
CA$490.00 - CA$490.00
CA$490.00
CA$490.00 - CA$490.00
CA$490.00
CA$490.00 - CA$490.00
CA$490.00

Starlight Instruments Feather Touch Micro Focuser for Celestron CPC800/RASA 8", NexStar 6SE, C8Edge HD 8SE SCT and Sky-Watcher 150/180mm Mak

SI-FTM-CPC8

Replaces stock SCT focuser with a dual-speed mechanism Eliminates image shift for high-magnification viewing and imaging Designed for specific Cel...

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CA$490.00 - CA$490.00
CA$490.00
CA$490.00 - CA$490.00
CA$490.00
CA$504.00 - CA$504.00
CA$504.00
CA$504.00 - CA$504.00
CA$504.00

Starlight Instruments Feather Touch Micro Focuser for Celestron CPC9.25, C9.25 Edge HD, SCT

SI-FTM-CPC9.25

Replaces stock focuser knob with a dual-speed system Eliminates image shift and mirror flop common in SCTs Planetary reduction mechanism for ultra...

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CA$504.00 - CA$504.00
CA$504.00
CA$504.00 - CA$504.00
CA$504.00
CA$490.00 - CA$490.00
CA$490.00
CA$490.00 - CA$490.00
CA$490.00

Starlight Instruments Feather Touch Micro for Celestron C11 SCT (NOT CPC1100)

SI-FTM-C11

Replaces stock focuser on Celestron C11 SCTs Adds dual-speed fine focusing control Eliminates image shift and backlash Designed for C11 telescopes...

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CA$490.00 - CA$490.00
CA$490.00
CA$490.00 - CA$490.00
CA$490.00

Manual, Motorized and Robotic Focus

All focusers move a drawtube. What separates them is how much they can hold without slipping and how repeatably they can return to a position.

  • Dual-speed manual focusers: Coarse and 10:1 fine focus, entirely adequate for visual observing and for imaging where you are willing to refocus by hand periodically.
  • Stepper motor focusers: Absolute positioning with repeatable steps, enabling automated focus routines and per-filter focus offsets.
  • Robotic microfocusers: High load capacity with integrated temperature sensing and position feedback, designed for unattended operation across a whole night.
  • Load capacity: The specification that matters most for imaging. A camera, filter wheel, off-axis guider and adapters add up quickly, and the load acts as a bending moment when the tube is horizontal.
  • Travel and profile height: A replacement focuser with a taller profile can prevent a telescope reaching focus, particularly on Newtonians. This must be checked before purchase.
  • Temperature compensation: A sensor and coefficient that shift focus automatically as the tube cools, which removes the largest single source of overnight focus drift.

Why Choose David Astro for Focusers

A focuser is a retrofit, and retrofits fail on details that are easy to check beforehand.

  • Focus travel verified: We check that the new focuser's profile still allows your telescope to reach focus with your intended camera or diagonal, which is the most common retrofit failure.
  • Adapter identified: We specify the telescope-specific mounting flange alongside the focuser, so the parts arrive complete.
  • Load calculated with the moment arm: We consider the weight and its distance from the drawtube, not just the total mass.
  • Authorized dealer: Full manufacturer warranty with service handled in Canada.
  • Canadian stock: Ships domestically without duties or brokerage fees for Canadian orders.

Focusers in Canada — Frequently Asked Questions

Do I need an electronic focuser?
For imaging below about f/6, yes in practice. Focus shift with temperature exceeds the critical focus zone over a Canadian night, and refocusing manually every hour costs you exposures and disturbs the rig.
Will a new focuser fit my Newtonian?
Only if its profile height is compatible. A taller focuser can push the focal plane beyond the drawtube's inward travel. Tell us the telescope and we will check before you order.
How much load can a focuser really take?
Rated capacities usually assume the tube pointing up. Near the horizon the same weight acts as a bending moment and effective capacity drops. We size with margin for that.
Can I add temperature compensation later?
On most stepper-based systems, yes — a temperature probe and a measured coefficient are all that is required. We can help determine the coefficient for your specific tube.

Replacing a focuser?

Send us your telescope and imaging train weight and we will specify the focuser and flange. Ships from our Canadian warehouse.