iOptron 4.5kg Counterweight for iEQ30, ZEQ25, CEM25 and CEM40

You need the iOptron 4.5kg counterweight if you cannot achieve balance with your existing weights after adding a larger telescope, guide scope, or heavy camera. If your rig is still tube-heavy with the standard weight at the very end of the shaft, this heavier 4.5kg weight is required to achieve proper balance, which is when the telescope remains stationary in any orientation with the clutches unlocked.

An 8" SCT OTA typically weighs between 5-6 kg. A single 4.5kg counterweight, positioned further down the 20mm shaft, should provide sufficient leverage to balance the telescope for visual use. If you add a heavy imaging train with a guide scope and camera, you may need to add a second, smaller weight.

No. This counterweight is specifically designed for mounts with a 20mm diameter counterweight shaft, such as the iEQ30, ZEQ25, CEM25, and CEM40. The iOptron SkyGuider Pro uses a smaller, proprietary counterweight and shaft system.

The central bore of the iOptron 4.5kg counterweight is designed to fit a 20mm diameter counterweight shaft, which is the standard for the compatible iEQ30, ZEQ25, CEM25, and CEM40 mounts.

For long-exposure astrophotography of targets like the Andromeda Galaxy (M31), perfect balance is critical for precise tracking. The 4.5kg counterweight ensures your CEM40's motors are not strained, preventing tracking errors that cause trailed stars and blurry images. It allows the mount to operate smoothly, which is essential for capturing fine detail over long imaging sessions.

Yes, as long as your 20mm counterweight shaft has sufficient length, you can stack multiple counterweights to balance very heavy payloads. Always ensure the total weight of your telescope, accessories, and counterweights does not exceed the mount's specified maximum payload capacity.