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Contrepoids

Balance is free performance. A correctly balanced mount asks less of its motors, guides more smoothly, and holds tracking better in wind — and getting there costs nothing but the right counterweight in the right place. David Astro carries counterweights in Canada across the common shaft diameters, along with extension bars and shaft accessories, held in our Canadian warehouse.

Shaft diameter is mount-specific and not always documented clearly. Tell us your mount model and payload and we will specify the weight.

Filtres

iOptron Counterweight Shaft Extension Bar for CEM26 & GEM28
CA$45.00 - CA$45.00
CA$45.00
CA$45.00 - CA$45.00
CA$45.00

iOptron Counterweight Shaft Extension Bar for CEM26 & GEM28

IOP-8457
1 en stock

Extends Counterweight Shaft Length Designed for iOptron CEM26 and GEM28 Mounts Enables Balancing of Heavier or Longer Telescopes Reduces the Need ...

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CA$45.00 - CA$45.00
CA$45.00
CA$45.00 - CA$45.00
CA$45.00
iOptron Counterweight Shaft for iOptron SGP and HAE Mounts
CA$49.00 - CA$49.00
CA$49.00
CA$49.00 - CA$49.00
CA$49.00

iOptron Counterweight Shaft for iOptron SGP and HAE Mounts

IOP-P-SGP-CWS

200mm (7.875 in.) extended length Standard 20mm (0.79 in.) diameter Fits iOptron SkyGuider Pro and HAE mounts Dual 3/8"-16 threads for extension I...

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CA$49.00 - CA$49.00
CA$49.00
CA$49.00 - CA$49.00
CA$49.00
iOptron Cube Counterweight shaft
CA$39.00 - CA$39.00
CA$39.00
CA$39.00 - CA$39.00
CA$39.00

iOptron Cube Counterweight shaft

IOP-8607

150mm (5.9 in.) Length 19mm (0.74 in.) Diameter M14 Female Thread Weight: 11 oz Description FAQ Specifications In the Box Warranty Cube C...

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CA$39.00 - CA$39.00
CA$39.00
CA$39.00 - CA$39.00
CA$39.00
iOptron HAZ46 Counterweight Shaft & Adapter
CA$203.00 - CA$203.00
CA$203.00
CA$203.00 - CA$203.00
CA$203.00

iOptron HAZ46 Counterweight Shaft & Adapter

IOP-8459

Enables counterweight use on the iOptron HAZ46 mount Improves balance for heavy or long optical tubes Reduces strain on the strain wave drive syst...

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CA$203.00 - CA$203.00
CA$203.00
CA$203.00 - CA$203.00
CA$203.00
CA$63.00 - CA$63.00
CA$63.00
CA$63.00 - CA$63.00
CA$63.00

Barre de contrepoids iOptron HEM27/HEM44

IOP-8456SL

Cette barre de contrepoids s'adapte à un support HEM27/HEM44. C'est également la barre CW d'origine pour une monture CEM26/GEM28. Dimensions: ...

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CA$63.00 - CA$63.00
CA$63.00
CA$63.00 - CA$63.00
CA$63.00
iOptron SkyTracker Pro Counterweight Package (3324)
CA$139.00 - CA$139.00
CA$139.00
CA$139.00 - CA$139.00
CA$139.00

iOptron SkyTracker Pro Counterweight Package (3324)

IOP-3324
1 en stock

Enables balancing of heavier camera and lens combinations Improves tracking accuracy by reducing motor strain Attaches directly to the iOptron Sky...

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CA$139.00 - CA$139.00
CA$139.00
CA$139.00 - CA$139.00
CA$139.00
CA$109.00 - CA$109.00
CA$109.00
CA$109.00 - CA$109.00
CA$109.00

iOptron Stainless Steel Extension Bar for CEM40/50/60/70/etc.

IOP-8026
1 en stock

Extends counterweight shaft length Increases counterweight leverage Allows for balancing heavier payloads with fewer weights Stainless steel const...

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CA$109.00 - CA$109.00
CA$109.00
CA$109.00 - CA$109.00
CA$109.00
iOptron ZEQ25/CEM25 Counterweight Shaft Extension Bar
CA$42.00 - CA$42.00
CA$42.00
CA$42.00 - CA$42.00
CA$42.00

iOptron ZEQ25/CEM25 Counterweight Shaft Extension Bar

IOP-7126

Extends Counterweight Shaft Length Increases Balancing Leverage Allows for Heavier Telescope Payloads Compatible with iOptron ZEQ25 Mounts Compati...

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CA$42.00 - CA$42.00
CA$42.00
CA$42.00 - CA$42.00
CA$42.00
CA$49.00 - CA$49.00
CA$49.00
CA$49.00 - CA$49.00
CA$49.00

PrimaLuceLab Contrepoids PLUS 1Kg

PLL-CONTRPLUS
1 en stock

Ce contrepoids de 1 Kg permet un équilibrage plus facile des tubes optiques. Il peut être installé des deux côtés, sur l'optique avant ou arrière d...

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CA$49.00 - CA$49.00
CA$49.00
CA$49.00 - CA$49.00
CA$49.00
PrimaLuceLab Counterweight PLUS 1Kg
CA$63.00 - CA$63.00
CA$63.00
CA$63.00 - CA$63.00
CA$63.00

PrimaLuceLab Counterweight PLUS 1Kg

PLL-CONTRPLUS
1 en stock

Adds 1 Kg for precise balance adjustments Compact 65x60mm footprint 35mm thickness Stackable design for creating heavier weights Integrates with t...

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CA$63.00 - CA$63.00
CA$63.00
CA$63.00 - CA$63.00
CA$63.00
CA$70.00 - CA$70.00
CA$70.00
CA$70.00 - CA$70.00
CA$70.00

Sky-Watcher Contrepoids AZ-EQ5

SW-S30201
1 en stock

Fonctionne sur les montures AZ-EQ-5, EQ6 et EQ6-R. 7,5 livres.

CA$70.00 - CA$70.00
CA$70.00
CA$70.00 - CA$70.00
CA$70.00
CA$80.00 - CA$80.00
CA$80.00
CA$80.00 - CA$80.00
CA$80.00

Sky-Watcher Contrepoids AZ-EQ6

SW-S30301

Fonctionne sur les supports AZ-EQ6 11 livres

CA$80.00 - CA$80.00
CA$80.00
CA$80.00 - CA$80.00
CA$80.00
CA$80.00 - CA$80.00
CA$80.00
CA$80.00 - CA$80.00
CA$80.00

Sky-Watcher Contrepoids EQ6-R

SW-S30101

Fonctionne sur les montures AZ-EQ-5, EQ6 et EQ6-R. 11 livres.

CA$80.00 - CA$80.00
CA$80.00
CA$80.00 - CA$80.00
CA$80.00
CA$230.00 - CA$230.00
CA$230.00
CA$230.00 - CA$230.00
CA$230.00

Sky-Watcher Contrepoids de 22 lb EQ8-R

SW-S30610
2 en stock

Contrepoids de 22 livres pour les supports de la série EQ8-R

CA$230.00 - CA$230.00
CA$230.00
CA$230.00 - CA$230.00
CA$230.00
CA$170.00 - CA$170.00
CA$170.00
CA$170.00 - CA$170.00
CA$170.00

Kit de contrepoids Sky-Watcher Wave

SW-S30914

Kit de contrepoids en acier inoxydable pour têtes de montage Wave Barre de contrepoids : 0,79 pouce (20 mm) de diamètre x 12,4 pouces (314 mm)...

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CA$170.00 - CA$170.00
CA$170.00
CA$170.00 - CA$170.00
CA$170.00
Épuisé
CA$399.00 - CA$399.00
CA$399.00
CA$399.00 - CA$399.00
CA$399.00

Tige de contrepoids Paramount ME/ME II de Software Bisque 1,5"

SB10235

L'arbre de contrepoids standard qui est inclus avec tous les supports Paramount ME d'origine . Caractéristiques Longueur : 46 cm (18 po.) Diamè...

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CA$399.00 - CA$399.00
CA$399.00
CA$399.00 - CA$399.00
CA$399.00
Épuisé
Épuisé
CA$224.00 - CA$224.00
CA$224.00
CA$224.00 - CA$224.00
CA$224.00

Software Bisque 1.5" Paramount ME/ME II/MX/MX+/MYT Extension d'arbre de contrepoids

SB10102

Fournit un bras d'équilibrage de contrepoids plus long et une plus grande capacité totale de contrepoids. La barre d'extension d'arbre de contrepo...

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CA$224.00 - CA$224.00
CA$224.00
CA$224.00 - CA$224.00
CA$224.00
Épuisé
Épuisé
CA$350.00 - CA$350.00
CA$350.00
CA$350.00 - CA$350.00
CA$350.00

Tige de contrepoids Paramount MX/MX+ Software Bisque 1,5"

SB10270

L'arbre de contrepoids standard qui est inclus avec tous les supports Paramount MX et MX+. Caractéristiques Longueur : 41 cm (16 po) Diamètre :...

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CA$350.00 - CA$350.00
CA$350.00
CA$350.00 - CA$350.00
CA$350.00
Épuisé
Épuisé
CA$364.00 - CA$364.00
CA$364.00
CA$364.00 - CA$364.00
CA$364.00

Software Bisque Rallonge d'arbre de contrepoids Paramount ME II de 1,875 po

SB10256

Fournit un bras d'équilibrage de contrepoids plus long et une plus grande capacité totale de contrepoids. La barre d'extension d'arbre de contrepo...

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CA$364.00 - CA$364.00
CA$364.00
CA$364.00 - CA$364.00
CA$364.00
Épuisé
Épuisé
CA$770.00 - CA$770.00
CA$770.00
CA$770.00 - CA$770.00
CA$770.00

Software Bisque Paramount ME II 1.875" Alésage 30 lb Contrepoids

SB10255

Contrepoids en acier inoxydable usinés avec précision. Ce contrepoids est compatible avec le Paramount ME II 1.875-in. arbre de contrepoids de dia...

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CA$770.00 - CA$770.00
CA$770.00
CA$770.00 - CA$770.00
CA$770.00
Épuisé
Épuisé
CA$952.00 - CA$952.00
CA$952.00
CA$952.00 - CA$952.00
CA$952.00

Software Bisque Paramount ME II 1.875" Alésage 40 lb Contrepoids

SB10293

Contrepoids en acier inoxydable usinés avec précision. Ce contrepoids optionnel de 18,1 kg (40 lb) est compatible avec l'arbre de contrepoids Para...

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CA$952.00 - CA$952.00
CA$952.00
CA$952.00 - CA$952.00
CA$952.00
Épuisé
Épuisé
CA$588.00 - CA$588.00
CA$588.00
CA$588.00 - CA$588.00
CA$588.00

Logiciel Bisque Paramount ME/ME II/MX/MX+/MYT Alésage 1,5" Contrepoids 20 lb

SB10106

Contrepoids en acier inoxydable usinés avec précision. Ces contrepoids d'alésage de 1,50″ (3,81 cm) sont compatibles avec tous les arbres de contr...

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CA$588.00 - CA$588.00
CA$588.00
CA$588.00 - CA$588.00
CA$588.00
Épuisé
Épuisé
CA$504.00 - CA$504.00
CA$504.00
CA$504.00 - CA$504.00
CA$504.00

Logiciel Bisque Paramount ME/ME II/MX/MYT 1,5" Alésage 10 lb Contrepoids

SB10274

Contrepoids en acier inoxydable usinés avec précision. Ces contrepoids d'alésage de 1,50″ (3,81 cm) sont compatibles avec tous les arbres de contr...

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CA$504.00 - CA$504.00
CA$504.00
CA$504.00 - CA$504.00
CA$504.00
Épuisé
Tele Vue Telescope Balance Aid 1
CA$59.00 - CA$59.00
CA$59.00
CA$59.00 - CA$59.00
CA$59.00

Tele Vue Telescope Balance Aid

TV-APB-1008

Moves the mounting point about 2.5" toward the objective Attaches to the TV-76 mount ring with the screws provided Hardware for Tele-Pod-style mou...

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CA$59.00 - CA$59.00
CA$59.00
CA$59.00 - CA$59.00
CA$59.00

Balancing a Mount Properly

Good balance is not simply equal weight. Where the counterweight sits on the shaft changes the moment of inertia, which affects how the mount responds to guiding corrections.

  • Shaft diameter matching: Counterweight bores are mount-specific. A weight that nearly fits will either not seat or will mark the shaft, so the model matters more than the mass.
  • Weight position: A heavier weight close to the mount gives lower inertia than a light weight far out. Lower inertia generally responds better to guiding corrections.
  • Extension bars: Lengthen the shaft so a short heavy tube can be balanced with less total weight, reducing the load on the mount's bearings.
  • Declination balance: Balance in both axes, not just right ascension. Declination imbalance shows up as one-directional guiding error that is easily mistaken for backlash.
  • Slight east-heavy bias: A small deliberate imbalance keeps the gear teeth loaded on one face, which removes backlash effects in right ascension for many mounts.
  • Cable and accessory weight: A camera, filter wheel and cable bundle shift the balance point measurably, and balance should be set with everything attached.

Why Choose David Astro for Counterweights

A counterweight is a simple product with a mount-specific fit and a real effect on guiding.

  • Shaft diameter confirmed: We identify the correct bore for your mount rather than asking you to measure a shaft in the dark.
  • Balance technique advice: We explain how to balance in both axes with the full imaging train attached, including the deliberate east-heavy bias where it helps.
  • Extension bar sizing: For short heavy tubes we recommend an extension rather than more mass, which is easier on the mount and on you.
  • Authorized dealer: Genuine weights with manufacturer warranty, in Canadian stock.
  • Domestic shipping: Heavy items ship from Canada with no duties or brokerage fees for Canadian buyers.

Counterweights in Canada — Frequently Asked Questions

How much counterweight do I need?
Enough to balance with the weight roughly two thirds along the shaft, not at the far end. Sitting at the extreme end means you have too little mass and no adjustment range left.
Does counterweight position affect guiding?
Yes. A heavy weight close in gives lower rotational inertia than a light one far out, and lower inertia generally responds more crisply to guiding corrections.
Should I balance perfectly?
In declination, yes. In right ascension, many mounts guide better with a small east-heavy bias, which keeps the worm loaded against one gear face and removes backlash from the correction path.
Will any counterweight fit my mount?
No. Bore diameters vary between manufacturers and models. Tell us your mount and we will confirm the correct shaft size before shipping.

Balancing your rig?

Tell us your mount and payload and we will specify the weight and any extension. Held in Canada, shipped fast.