iOptron CEM26, HEM27, GEM28 Counterweight Extension Bar

Running out of room on your counterweight shaft? The iOptron Counterweight Extension Bar #8457 gives you the extra reach you need to properly balance longer optical tubes or heavier payloads—without stacking additional counterweights unnecessarily close to the mount head.

This extension bar is purpose-built for the CEM26, HEM27, and GEM28 mounts. It threads directly onto your existing counterweight shaft and adds 120mm (about 4.7 inches) of additional length, giving you more leverage and balance flexibility—especially useful when space is tight or you want to reduce total counterweight mass.

Key Features:

• Adds 120mm of Extension: Extends your counterweight shaft by 120mm to help balance heavier setups or longer telescope tubes.

• Compatible Threading: Screws directly into the existing counterweight shaft on iOptron CEM26, HEM27, and GEM28 mounts.

• Accepts Standard Counterweights: Works with the same 20mm bore counterweights you already use on your iOptron shaft.

• Strong and Stable: Constructed from solid steel for durability and vibration resistance under load.

• Compact and Efficient: Offers a lighter alternative to adding more counterweights, and it's small enough to take with you when traveling to remote dark sites.

Technical Specs:

• Compatibility: iOptron CEM26, HEM27, GEM28 mounts

• Material: Steel

• Extension Length: 120mm (4.7 inches)

• Counterweight Compatibility: 20mm center hole

• Connection: Threaded (male)

• Part Number: #8457

Observing Tip:

Balancing a longer telescope isn't just about mass—it's about distance. Adding this extension bar allows you to position a single weight farther from the mount axis, which often results in smoother performance with less total mass. That’s especially helpful for portable setups where every pound counts.