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Accessoires de mise au point

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.

Filtres

Askar 50P AF KIT
$79.00 - $79.00
$79.00
$79.00 - $79.00
$79.00

Askar 50P AF KIT

ASK-50P-AFKIT
5 en stock

Enables automated focusing for the Askar 50P astrograph Compatible with almost all brands of electronic focusers Eliminates manual focus adjustmen...

Afficher tous les détails
$79.00 - $79.00
$79.00
$79.00 - $79.00
$79.00
Askar ACL200 AF Kit
$108.00 - $108.00
$108.00
$108.00 - $108.00
$108.00

Askar ACL200 AF Kit

ASK-ASKAREAFKIT
1 en stock

Adds electronic autofocus capability to the Askar ACL200 lens Designed for seamless integration with ZWO EAF and other electronic focusers Include...

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$108.00 - $108.00
$108.00
$108.00 - $108.00
$108.00
$87.00 - $87.00
$87.00
$87.00 - $87.00
$87.00

Askar AF Kit for FMA180 Pro

ASK-ASKAF180P
1 en stock

Enables Electronic Autofocus on the Askar FMA180 Pro Designed for Seamless Integration with ZWO EAF Broadly Compatible with Most Electronic Focuse...

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$87.00 - $87.00
$87.00
$87.00 - $87.00
$87.00
Askar FRA400C AF Kit
$29.00 - $29.00
$29.00
$29.00 - $29.00
$29.00

Askar FRA400C AF Kit

ASK-FRA400C-AFKIT

Enables Automatic Focusing on the Askar FRA400C Compatible with Most Brands of Electronic Focusers Includes Five Synchronous Belts for a Secure Fi...

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$29.00 - $29.00
$29.00
$29.00 - $29.00
$29.00
$87.00 - $87.00
$87.00
$87.00 - $87.00
$87.00

Askar SQA55 Autofocus Kit

ASK-SQA55AFKIT

Designed specifically for the Askar SQA55 Astrograph Enables autofocus with nearly all brands of electronic focusers Includes 4 MXL belts and 2 pu...

Afficher tous les détails
$87.00 - $87.00
$87.00
$87.00 - $87.00
$87.00
$37.00 - $37.00
$37.00
$37.00 - $37.00
$37.00

Baader Adaptateur Diamond Steeltrack - M48x0.75(M)

BAA-2957204

Adaptateur BDS avec filetage extérieur M48 pour connecter des pièces M48 Se monte à la place du collier standard avec la bague queue d'aronde S...

Afficher tous les détails
$37.00 - $37.00
$37.00
$37.00 - $37.00
$37.00
$36.00 - $36.00
$36.00
$36.00 - $36.00
$36.00

Baader Adaptateur Diamond Steeltrack - T-2(M)

BAA-2957202

Adaptateur BDS avec filetage extérieur T-2 pour connecter des pièces T-2 Se monte à la place du collier standard avec la bague queue d'aronde S5...

Afficher tous les détails
$36.00 - $36.00
$36.00
$36.00 - $36.00
$36.00
$52.00 - $52.00
$52.00
$52.00 - $52.00
$52.00

Baader Adaptateur Diamond Steeltrack -M68x0.75(M)

BAA-2957206

Adaptateur BDS avec filetage extérieur M68 pour connecter des pièces M68 Se monte à la place du collier standard avec la bague queue d'aronde S5...

Afficher tous les détails
$52.00 - $52.00
$52.00
$52.00 - $52.00
$52.00
$33.00 - $33.00
$33.00
$33.00 - $33.00
$33.00

Baader Adaptateur NT Steeltrack - 2"/1.25"

BAA-2408152

Réducteur spécial 2" / 1¼" avec hauteur optique de 4,5 mm uniquement Convient pour BDS-NT Diamond Steeltrack Comprend un porte-filtre de 2" (fi...

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$33.00 - $33.00
$33.00
$33.00 - $33.00
$33.00
Baader Planetarium Adapter S58-short to M54a – for all BDS Diamond Steeltrack®
$50.00 - $50.00
$50.00
$50.00 - $50.00
$50.00

Baader Planetarium Adapter S58-short to M54a – for all BDS Diamond Steeltrack®

BAA-2957209

Adapts the Baader S58 drawtube thread to a female M54a thread Designed for all Baader Diamond Steeltrack® (BDS) focusers Enables direct connection...

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$50.00 - $50.00
$50.00
$50.00 - $50.00
$50.00
Baader Planetarium Adapter S58-short to M68i – for all BDS Diamond Steeltrack®
$86.00 - $86.00
$86.00
$86.00 - $86.00
$86.00

Baader Planetarium Adapter S58-short to M68i – for all BDS Diamond Steeltrack®

BAA-2957207

Adapts the Baader S58 dovetail thread to M68i Provides a secure, rigid M68i female (internal) thread connection Designed for all Baader Diamond St...

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$86.00 - $86.00
$86.00
$86.00 - $86.00
$86.00
Baader Planetarium BDS-SC Adapter S88i to M48i
$156.00 - $156.00
$156.00
$156.00 - $156.00
$156.00

Baader Planetarium BDS-SC Adapter S88i to M48i

BAA-2957297

Connects Baader Diamond Steeltrack SC (BDS-SC) focusers to M48 accessories Provides a standard female M48 (M48x0.75) accessory thread Enables a ri...

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$156.00 - $156.00
$156.00
$156.00 - $156.00
$156.00
Baader Planetarium Steeldrive II Adapter set for FeatherTouch 3.5" focusers
$139.00 - $139.00
$139.00
$139.00 - $139.00
$139.00

Baader Planetarium Steeldrive II Adapter set for FeatherTouch 3.5" focusers

BAA-2957270

Enables motorization of FeatherTouch 3.5" focusers Designed for the Baader Steeldrive II motor Provides a secure, no-slip mechanical coupling Faci...

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$139.00 - $139.00
$139.00
$139.00 - $139.00
$139.00
Baader Planetarium Steeldrive II Belt Cover – 3D-printed
$64.00 - $64.00
$64.00
$64.00 - $64.00
$64.00

Baader Planetarium Steeldrive II Belt Cover – 3D-printed

BAA-2957259

Protects Steeldrive II belt and pulleys Shields drive system from dew, dust, and debris Prevents accidental snags on cables or clothing Custom-des...

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$64.00 - $64.00
$64.00
$64.00 - $64.00
$64.00
$70.00 - $70.00
$70.00
$70.00 - $70.00
$70.00

Baader Adaptateur Pushfix Low Profile - 1.25"/2" pour Porte-Oculaires Steeltrack NT

BAA-2408151

Idéal pour les porte-oculaires Newton, par exemple les porte-oculaires Baader Newton Crayford avec une longueur de chemin optique de seulement 1 ...

Afficher tous les détails
$70.00 - $70.00
$70.00
$70.00 - $70.00
$70.00
$50.00 - $50.00
$50.00
$50.00 - $50.00
$50.00

Baader Support du Contrôleur Steeldrive II pour Barre à queue d'aronde 3"

BAA-2957261

Support pour fixer le contrôleur Steeldrive II à une queue d'aronde de 3" Convient à toutes les pinces à queue d'aronde de 3" (Losmandy standar...

Afficher tous les détails
$50.00 - $50.00
$50.00
$50.00 - $50.00
$50.00
$91.00 - $91.00
$91.00
$91.00 - $91.00
$91.00

Baader Anneau Magnétique Steeldrive II pour Capteur de Référence (Homing Sensor)

BAA-2957264

Anneau d'aimant en métal pour le capteur de prise d'origine de Steeldrive II. Compatible avec les porte-oculaires Baader Diamond Steeltrack Si ...

Afficher tous les détails
$91.00 - $91.00
$91.00
$91.00 - $91.00
$91.00
$35.00 - $35.00
$35.00
$35.00 - $35.00
$35.00

Baader Capteur de Température Steeldrive II - 1m

BAA-2957263

Capteur de température avec connecteur et 1Mcable, prend également en charge le contrôle du chauffage du bouclier de rosée. Peut être utilisé a...

Afficher tous les détails
$35.00 - $35.00
$35.00
$35.00 - $35.00
$35.00
$35.00 - $35.00
$35.00
$35.00 - $35.00
$35.00

Baader Capteur de Température Steeldrive II - 1m Plat

BAA-2957263F

Capteur de température pour compenser la dérive automatiquement, s'il y a de grandes différences de température Design plat, idéal pour être fix...

Afficher tous les détails
$35.00 - $35.00
$35.00
$35.00 - $35.00
$35.00
$79.00 - $79.00
$79.00
$79.00 - $79.00
$79.00

Daystar Tube d'Extension Quantum - 2" 80mm de long

DAY-GM2D2

Tube d'extension Daystar Quantum - 2" 80mm de long

$79.00 - $79.00
$79.00
$79.00 - $79.00
$79.00
$99.99 - $99.99
$99.99
$99.99 - $99.99
$99.99

Explore Scientific Adaptateur FFFR507X-00 à Porte-Oculaire HEX 2.5"

ES-510366

Explorez l'adaptateur scientifique pour permettre l'utilisation du correcteur FFFR507X-00 3" 0,7x sur le porte-oculaire hexagonal 2,5"

$99.99 - $99.99
$99.99
$99.99 - $99.99
$99.99
$29.99 - $29.99
$29.99
$29.99 - $29.99
$29.99

Explore Scientific Tube d'Extension 1" pour Porte-Oculaire à Crémaillère

ES-ESRPEXT1

Tube d'extension de 2,5 cm pour porte-oculaire à pignon et crémaillère Explore Scientific

$29.99 - $29.99
$29.99
$29.99 - $29.99
$29.99
$39.99 - $39.99
$39.99
$39.99 - $39.99
$39.99

Explore Scientific Tube d'Extension 2" pour Porte-Oculaire à Crémaillère

ES-ESRPEXT2
1 en stock

Tube d'extension de 5,1 cm pour porte-oculaire à pignon et crémaillère Explore Scientific

$39.99 - $39.99
$39.99
$39.99 - $39.99
$39.99
$44.99 - $44.99
$44.99
$44.99 - $44.99
$44.99

Explore Scientific Tube d'Extension 2.5" pour Porte-Oculaire à Crémaillère

ES-ESHEXEXT2

Tube d'extension de 6,3 cm pour porte-oculaire à pignon et crémaillère Explore Scientific

$44.99 - $44.99
$44.99
$44.99 - $44.99
$44.99

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.