iOptron CEM120 EC2 Center Balanced EQ Mount with Dual High End Encoders

  • 115 lbs payload capacity
  • Tracking accuracy of less than 0.15 arcsec RMS
  • 12 port cable management saddle
  • LAN, RS232, USB and Wifi Control options for remote observatory setups
  • Built-in 32 Channel GPS 

Note: If you are going to mount this atop an already purchased Tri-Pier (8034) you will need an adapter plate #IO-8036-120. (You can find this below in the Recommended Products card.) Otherwise we advise to get the IO-8037 Tri-pier which already had the adapter plate attached.

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  • Regular price $6,998.00

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iOptron CEM120 EC2 Center Balanced EQ Mount with Dual High End Encoders

With the growing demand for accuracy, heavy capacity, stability, and versatility in an equatorial mount, iOptron created the CEM120 to meet all these needs. The CEM 120 like all center balance designs are naturally stable is due to putting the weight of the telescopes directly over the center of the pier or tripod.

The mount’s performance is demonstrated by its low periodic tracking error that is less than 0.15 arcseconds RMS. The CEM120 features an advanced cable management system consisting that prevents tangle ups and reduces the chance of fractured cables. It also adds some new features to the CEM family like Wi-Fi and LAN for remote operation.

The CEM120EC2 has fixed home sensors on each axis. Because of this alignment models are saved and can be reused on future nights as long as the mount is not physically altered after power off. It also can be “homed” through software if position is lost.


Azimuth Range Plus or minus 5 degrees
Dec Worm Wheel216mm/360 teeth
Free ShippingYes
Head DesignEquatorial
Instrument Capacity115 lb
Latitude Range 65 degrees
RA Worm Wheel216mm/360 teeth
Saddle WidthD Series
Tracking ModesEQ North & EQ South
Tracking RatesLunar & Sidereal & Solar
Warranty2 Year Warranty
weight57 lb
Worm Period240 seconds


  • CEM120EC2 mount head x1
  • Go2Nova 8407 V2 hand controller x1
  • 10 kg counterweight x2
  • Counterweight shaft x1
  • Hand controller cable x1
  • Serial cable (#8412) x1
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3.0 Based on 1 Reviews
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Ross S.
United States United States
mediocre performance and poor support from the vendor

It turns out that most of these mounts do not meet their specifications. Mine certainly doesn't. Despite lots of attempts to engage the vendor to remedy the problem or ot give me a replacement that does meet the specification, they refused. My most recent polite question about the situation was met with no response at all. I'd stay away from any iOptron mount with encoders if you have a long focal length telescope.