Skip to content

Focusers and Accessories

Focus is the difference between a sharp image and a nearly sharp one, and holding it across a Canadian night — where temperatures can drop fifteen degrees between dusk and dawn — is a mechanical problem, not a patience problem. David Astro carries focusers and focuser accessories in Canada, from Crayford and rack-and-pinion drawtubes to motor kits, rotators, compression rings and adapter flanges, in Canadian stock.

We fit focusers to telescopes routinely, including retrofits that require a specific flange or drawtube adapter. If you are replacing a stock focuser or adding motorization, tell us the telescope and we will confirm the fit.

Filters

PrimaLuceLab Adapter ESATTO 3" for Skywatcher ESPRIT 80 ED
CA$279.00 - CA$279.00
CA$279.00
CA$279.00 - CA$279.00
CA$279.00

PrimaLuceLab Adapter ESATTO 3" for Skywatcher ESPRIT 80 ED

PLL-PL3600643

Connects ESATTO 3" focuser to Skywatcher ESPRIT 80 ED telescopes Replaces the stock focuser for a high-precision upgrade Provides a secure, non-fl...

View full details
CA$279.00 - CA$279.00
CA$279.00
CA$279.00 - CA$279.00
CA$279.00
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...

View full details
CA$133.00 - CA$133.00
CA$133.00
CA$133.00 - CA$133.00
CA$133.00
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...

View full details
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...

View full details
CA$413.00 - CA$413.00
CA$413.00
CA$413.00 - CA$413.00
CA$413.00
PrimaLuceLab Adapter ESATTO 3,5" LP for telescopes with SC thread
CA$133.00 - CA$133.00
CA$133.00
CA$133.00 - CA$133.00
CA$133.00

PrimaLuceLab Adapter ESATTO 3,5" LP for telescopes with SC thread

PLL-PL3600366

Connects ESATTO 3.5" LP focuser to standard SC threads Low-profile design to preserve back focus All-metal construction for a rigid, flex-free con...

View full details
CA$133.00 - CA$133.00
CA$133.00
CA$133.00 - CA$133.00
CA$133.00
PrimaLuceLab Adapter ESATTO 3,5” LP for ARCO 3"
CA$133.00 - CA$133.00
CA$133.00
CA$133.00 - CA$133.00
CA$133.00

PrimaLuceLab Adapter ESATTO 3,5” LP for ARCO 3"

PLL-PL3600467

Connects ESATTO 3.5” LP Focuser to ARCO 3" Rotator Adds Only 3mm of Optical Thickness Enables Unified Control Through ESATTO Port Creates a Rigid,...

View full details
CA$133.00 - CA$133.00
CA$133.00
CA$133.00 - CA$133.00
CA$133.00
PrimaLuceLab Adapter ESATTO 3,5” LP for OfficinaStellare Veloce RH200
CA$273.00 - CA$273.00
CA$273.00
CA$273.00 - CA$273.00
CA$273.00

PrimaLuceLab Adapter ESATTO 3,5” LP for OfficinaStellare Veloce RH200

PLL-PL3600365

Connects ESATTO 3.5" LP focuser to Officina Stellare Veloce RH200 telescopes Designed to maintain optimal backfocus for imaging accessories Provid...

View full details
CA$273.00 - CA$273.00
CA$273.00
CA$273.00 - CA$273.00
CA$273.00
PrimaLuceLab Adapter ESATTO 3,5” LP for OfficinaStellare Veloce RH300
CA$413.00 - CA$413.00
CA$413.00
CA$413.00 - CA$413.00
CA$413.00

PrimaLuceLab Adapter ESATTO 3,5” LP for OfficinaStellare Veloce RH300

PLL-PL3600361

Connects ESATTO 3.5” LP Focuser to Officina Stellare Veloce RH300 Engineered for a precise, rigid, and perfectly aligned connection Maintains corr...

View full details
CA$413.00 - CA$413.00
CA$413.00
CA$413.00 - CA$413.00
CA$413.00
PrimaLuceLab Adapter ESATTO 3,5” LP for PlaneWave DeltaRho 350
CA$413.00 - CA$413.00
CA$413.00
CA$413.00 - CA$413.00
CA$413.00

PrimaLuceLab Adapter ESATTO 3,5” LP for PlaneWave DeltaRho 350

PLL-PL3600386

Connects ESATTO 3.5" LP Focuser to PlaneWave DeltaRho 350 Telescopes Engineered for a Rigid, No-Flex Connection Maintains Precise Optical Train Al...

View full details
CA$413.00 - CA$413.00
CA$413.00
CA$413.00 - CA$413.00
CA$413.00
PrimaLuceLab Adapter ESATTO 3.5" LP for GSO/Orion/TPO Ritchey-Chretien 10, 12, 14 and 16 inches
CA$175.00 - CA$175.00
CA$175.00
CA$175.00 - CA$175.00
CA$175.00

PrimaLuceLab Adapter ESATTO 3.5" LP for GSO/Orion/TPO Ritchey-Chretien 10, 12, 14 and 16 inches

PLL-PL3600367

Connects ESATTO 3.5" LP Focuser to Large RC Telescopes Telescope-Side Thread: M117x1 Female Compatible with 10", 12", 14", and 16" GSO/Orion/TPO R...

View full details
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 ESATTO 3.5" LP for telescopes with Large 3.3" SC Thread

PLL-PL3600362

Connects ESATTO 3.5" LP focuser to large-format Celestron telescopes Designed for the 3.3" rear cell thread on select SCT and EdgeHD models Low-pr...

View full details
CA$133.00 - CA$133.00
CA$133.00
CA$133.00 - CA$133.00
CA$133.00
PrimaLuceLab Adapter ESATTO 4" for ARCO 2"
CA$125.00 - CA$125.00
CA$125.00
CA$125.00 - CA$125.00
CA$125.00

PrimaLuceLab Adapter ESATTO 4" for ARCO 2"

PLL-PL3600423

Connects ARCO 2" Rotator to ESATTO 4" Focuser Enables Rotator Control via ESATTO Port Creates a Rigid, Integrated Imaging Train Designed for the P...

View full details
CA$125.00 - CA$125.00
CA$125.00
CA$125.00 - CA$125.00
CA$125.00
PrimaLuceLab Adapter ESATTO 4" for ARCO 3"
CA$203.00 - CA$203.00
CA$203.00
CA$203.00 - CA$203.00
CA$203.00

PrimaLuceLab Adapter ESATTO 4" for ARCO 3"

PLL-PL3600459

Connects PrimaLuceLab ESATTO 4" Focuser to ARCO 3" Rotator Enables single-port power and data for the ARCO 3" Creates a rigid, secure connection f...

View full details
CA$203.00 - CA$203.00
CA$203.00
CA$203.00 - CA$203.00
CA$203.00
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...

View full details
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...

View full details
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 ...

View full details
CA$231.00 - CA$231.00
CA$231.00
CA$231.00 - CA$231.00
CA$231.00
PrimaLuceLab Adapter ESATTO 4" for Takahashi TOA130
CA$273.00 - CA$273.00
CA$273.00
CA$273.00 - CA$273.00
CA$273.00

PrimaLuceLab Adapter ESATTO 4" for Takahashi TOA130

PLL-PL3600380

Description FAQ Specifications In the Box Warranty Adapter ESATTO 4" for Takahashi TOA130 The PrimaLuceLab Adapter for...

View full details
CA$273.00 - CA$273.00
CA$273.00
CA$273.00 - CA$273.00
CA$273.00
PrimaLuceLab Black color bushing long for SESTO SENSO 2 adapters
CA$22.00 - CA$22.00
CA$22.00
CA$22.00 - CA$22.00
CA$22.00

PrimaLuceLab Black color bushing long for SESTO SENSO 2 adapters

PLL-PL3600117

Upgrade Path Solution: Enables the use of first-generation SESTO SENSO adapters with the SESTO SENSO 2 motor. Cost-Effective Retrofit: Eliminate...

View full details
CA$22.00 - CA$22.00
CA$22.00
CA$22.00 - CA$22.00
CA$22.00
CA$41.00 - CA$41.00
CA$41.00
CA$41.00 - CA$41.00
CA$41.00

PrimaLuceLab DX Finder Base

PLL-PLLBACEDX
4 in stock

Universal finder base for multiple brands Dual-curvature design fits various telescope tubes Slotted holes for flexible mounting All-metal constru...

View full details
CA$41.00 - CA$41.00
CA$41.00
CA$41.00 - CA$41.00
CA$41.00
PrimaLuceLab ESATTO 2" Focuser with ARCO 2" Rotator
CA$1,987.00 - CA$1,987.00
CA$1,987.00
CA$1,987.00 - CA$1,987.00
CA$1,987.00

PrimaLuceLab ESATTO 2" Focuser with ARCO 2" Rotator

PLL-PLLEST2ARCO2

Combines robotic focuser and high-precision rotator in one unit Low-profile design for minimal back focus consumption Single-cable connection betw...

View full details
CA$1,987.00 - CA$1,987.00
CA$1,987.00
CA$1,987.00 - CA$1,987.00
CA$1,987.00
PrimaLuceLab ESATTO 2" LP Focuser with ARCO 2" Rotator
CA$2,331.00 - CA$2,331.00
CA$2,331.00
CA$2,331.00 - CA$2,331.00
CA$2,331.00

PrimaLuceLab ESATTO 2" LP Focuser with ARCO 2" Rotator

PLL-PLLEST2LPARCO2

Combines ESATTO 2" LP robotic focuser and ARCO 2" robotic rotator Low-profile design for compact imaging trains Unified power and data connection ...

View full details
CA$2,331.00 - CA$2,331.00
CA$2,331.00
CA$2,331.00 - CA$2,331.00
CA$2,331.00
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

PLL-PLLEST2LP-B

Ultra-low 32mm profile designed for low-backfocus telescopes 10mm of precise focuser travel 5 kg (11 lbs) payload capacity for heavy imaging train...

View full details
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$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

PLL-PLLEST2LP

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

View full details
CA$1,225.00 - CA$1,225.00
CA$1,225.00
CA$1,225.00 - CA$1,225.00
CA$1,225.00
Save 10% Save %
CA$945.00
CA$945.00 - CA$945.00
CA$945.00
CA$850.50
CA$850.50 - CA$850.50
CA$850.50

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...

View full details
CA$945.00
CA$945.00 - CA$945.00
CA$945.00
CA$850.50
CA$850.50 - CA$850.50
CA$850.50
Save 10% Save %

Focuser Mechanics and What Matters Under Load

A focuser has to hold a camera train weighing several kilograms perfectly square to the optical axis while moving in increments of a few microns. Two things determine whether it does: the drive mechanism and the load rating.

  • Crayford focusers: A friction roller on a flat surface, giving smooth, backlash-free travel. Excellent for visual and light imaging loads; can slip under heavy trains, particularly when pointed near zenith.
  • Rack-and-pinion focusers: Toothed engagement that will not slip regardless of load, which is why most heavy imaging trains use them. Modern designs have effectively eliminated the old backlash complaints.
  • Motorized and electronic focusers: Stepper-driven focus with position repeatability, enabling autofocus routines and temperature compensation across a session.
  • Rotators: Precise framing and camera angle control without breaking the imaging train, and essential for optimizing off-axis guide star placement.
  • Compression rings: Replace a single set screw that tilts and marks your barrel with even radial clamping — a small part with a visible effect on star shapes.
  • Adapters and flanges: Telescope-specific mounting plates that let a third-party focuser replace a stock one.

Why Choose David Astro for Focusers and Accessories

Focuser upgrades are one of the most cost-effective improvements in astrophotography, and one of the easiest to order incorrectly.

  • Retrofit fit checks: We identify the adapter flange your specific telescope needs, and confirm that the new focuser's travel and profile will still let you reach focus.
  • Load rating advice: We weigh your intended imaging train against the focuser's rated capacity, including the tilt load that shows up when the tube is near zenith.
  • Authorized dealer: Genuine parts with full manufacturer warranty, serviced in Canada.
  • Canadian stock: In-stock focusers and accessories ship domestically without duties or brokerage charges.
  • In-house repair: We service focuser mechanics and electronics directly, which matters for a component with moving parts that see heavy use.

Focusers in Canada — Frequently Asked Questions

Crayford or rack-and-pinion for imaging?
Rack-and-pinion, once your imaging train exceeds roughly 2 kg. A Crayford's friction drive can slip under load at steep angles, and the slip is often mistaken for focus drift.
Will a motorized focuser fit my existing focuser?
Often yes, through a telescope-specific bracket that couples to the fine-focus shaft. Tell us the focuser model and we will confirm whether a bracket exists or a full replacement is needed.
How much does focus shift with temperature?
Enough to matter. A metal tube contracts measurably over a 15 degree drop, and at fast focal ratios the critical focus zone is only tens of microns. Temperature-compensated autofocus solves it.
Do you carry focusers for older telescopes?
We carry a wide range of adapter flanges covering many discontinued tubes. Send us the make and drawtube diameter and we will check.

Upgrading your focuser?

Tell us your telescope and imaging train weight and we will specify the right focuser and flange. Canadian stock, expert fitting advice.