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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Askar AF Kit for FMA180 Pro
Enables Electronic Autofocus on the Askar FMA180 Pro Designed for Seamless Integration with ZWO EAF Broadly Compatible with Most Electronic Focuse...
View full detailsAskar SQA55 Autofocus Kit
Designed specifically for the Askar SQA55 Astrograph Enables autofocus with nearly all brands of electronic focusers Includes 4 MXL belts and 2 pu...
View full detailsBaader Planetarium Adapter S58-short to M54a – for all BDS Diamond Steeltrack®
Adapts the Baader S58 drawtube thread to a female M54a thread Designed for all Baader Diamond Steeltrack® (BDS) focusers Enables direct connection...
View full detailsBaader Planetarium Adapter S58-short to M68i – for all BDS Diamond Steeltrack®
Adapts the Baader S58 dovetail thread to M68i Provides a secure, rigid M68i female (internal) thread connection Designed for all Baader Diamond St...
View full detailsBaader Planetarium BDS-SC Adapter S88i to M48i
Connects Baader Diamond Steeltrack SC (BDS-SC) focusers to M48 accessories Provides a standard female M48 (M48x0.75) accessory thread Enables a ri...
View full detailsBaader Planetarium Steeldrive II Adapter set for FeatherTouch 3.5" focusers
Enables motorization of FeatherTouch 3.5" focusers Designed for the Baader Steeldrive II motor Provides a secure, no-slip mechanical coupling Faci...
View full detailsBaader Planetarium Steeldrive II Belt Cover – 3D-printed
Protects Steeldrive II belt and pulleys Shields drive system from dew, dust, and debris Prevents accidental snags on cables or clothing Custom-des...
View full detailsBaader Planetarium Steeldrive II Controller
Standalone hand controller for Baader Steeldrive II motor units Three distinct, selectable focusing modes for any scenario Full computer control a...
View full detailsBaader Planetarium Steeldrive II Motor Unit
High-torque stepper motor handles heavy imaging loads Timing belt drive eliminates backlash for precise autofocus Contactless homing sensor enable...
View full detailsBaader Steeldrive II Controller Holder for 3" Dovetail
Securely holds the Baader Steeldrive II Controller Designed specifically for 3" Losmandy-style dovetail bars Eliminates dangling cables and potent...
View full detailsBaader Steeldrive II Metal Magnet Ring for Homing Sensor
Enables precise, repeatable homing for Steeldrive II motor focusers Required for Diamond Steeltrack focusers with upgraded eyepiece holders Compat...
View full detailsBaader Steeldrive II Mini DIN/RCA Adapter Cable to Connect Heating Strips
Connects Steeldrive II AUX Port to RCA/Cinch Dew Heaters Enables Integrated Dew Control via SteelGo Software Simplifies Cable Management for Imagi...
View full detailsBaader Steeldrive II Motor Focuser w/ Controller
Handles heavy imaging loads up to 8 kg Achieves a focusing resolution of 2.5µm Backlash-free toothed belt drive system Standalone controller with ...
View full detailsBaader Steeldrive II Temperature Sensor - 1m
Enables automatic temperature compensation for the Baader Steeldrive II Maintains critical focus during overnight temperature shifts Provides real...
View full detailsBaader Steeldrive II Temperature Sensor - 1m Flat
Precise Temperature Data: Enables automatic focus compensation with the Steeldrive II controller. Flat Cable Design: Allows for clean, snag-free...
View full detailsCelestron Focus Motor
Adds precise, hands-free electronic focusing to Celestron SCT, EdgeHD, and RASA telescopes DC servo motor provides 1000 steps per revolution for f...
View full detailsiOptron iAFS2 2'' Camera Adapter
Connects Cameras to 2" Telescope Focusers Provides a Secure, Rigid Mounting Platform Standard T-Thread (M42x0.75) Camera Interface Matte Black Int...
View full detailsiOptron iAFS3 3'' Camera Adapter
3-inch Barrel Diameter Provides Secure Connection for Imaging Cameras Minimizes Flexure in the Optical Train Designed for Large Format Focusers ...
View full detailsLacerta Dual Speed 1:10 Microfocus Upgrade Kit for Crayford Focusers
1:10 micro reduction unit Compatibly with many brands Description In the Box Downloads Lacerta Dual Speed 1:10 Microfocus Upgrade Kit f...
View full detailsOrion Optics UK AG10 Equipment upgrade to allow fitting of Atlas focuser
Fits the FLI Atlas focuser to the AG10 Replaces the standard Ceres focuser Individually machined to order in the UK Description Specifications ...
View full detailsOrion Optics UK AG10 Focuser stabilisation upgrade and CNC tube ring stability upgrade kit for ACU-3 focuser or Atlas
For the AG10 astrograph Reinforces focuser and tube-ring positions For the ACU-3 or Atlas focuser Individually machined to order in the UK Desc...
View full detailsOrion Optics UK AG12 Equipment upgrade to allow fitting of Atlas focuser
Fits the FLI Atlas focuser to the AG12 Replaces the standard Ceres focuser Individually machined to order in the UK Description Specifications ...
View full detailsOrion Optics UK AG12 Focuser stabilisation upgrade and CNC tube ring stability upgrade kit for ACU-3 focuser or Atlas
For the AG12 astrograph Reinforces focuser and tube-ring positions For the ACU-3 or Atlas focuser Individually machined to order in the UK Desc...
View full detailsOrion Optics UK AG14 Equipment upgrade to allow fitting of Atlas focuser
Fits the FLI Atlas focuser to the AG14 Replaces the standard Ceres focuser Individually machined to order in the UK Description Specifications ...
View full detailsSmall 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.