iOptron CEM120 EC Center Balanced EQ Mount with 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 $5,500.00

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iOptron CEM120 EC Center Balanced EQ Mount with 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.


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


  • CEM120EC mount head x1
  • Go2Nova 8407 V2 hand controller x1
  • 10 kg counterweight x2
  • Counterweight shaft x1
  • Hand controller cable x1
  • Serial cable (#8412) x1
Customer Reviews
3.7 Based on 3 Reviews
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Excellent Mount

Kills my Celestron CGXL mount. Had to replace Celestron mount. Had to send the CGXL back to Celestron for repair. It was new. This CEM120 EC mount is awesome. Installed it on a Pier Tech pier. Only problem with it. When I turn it on. I get the main board error. Turn it off and back on. Then good to go. Tracking is dead on. Handles my 14" scope and other accessories no problem. Had to buy another weight for it. Came with two. I like the large screen on the hand control. So much better then the Celestron controller. I installed the QHY PoleMaster in it. Very easy install. Did the alignment. Tracking is dead on. Once I did the polar alignment. I keyed in the Ring Neblua. Bamm dead center. Polar alignment needs to be almost perfect for astrophotography. Have had no issues with elongated shots at two minutes or so exposure. I know this is not much of a review. This mount is well worth the money. I do have 4 or 5 dead pixels on the hand controller. Was like that as soon as I turned it on. Thought about contacting Ioptron about it. I would think they would replace it. Not sure if the EC or EC2 is worth the extra cost. As I start taking longer exposures I will find out.

$5500 Paperweight

I have had this mount for 8 months. There have been so many problems with it and I've never had it working completely. iOptron support is close to useless, so many emails back and forth, several days between each. Somebody actually picked up the support phone but explained he was a sales guy - though he listened to me and promised he would see to it that someone would call me back; never happened. I'm thinking of just cutting my losses and buying another mount - haven't created a single image with this.

Robin R.
United States
Ioptron CEM 120EC

The mount arrived on time. Setting up the mount on the observatory pier went well. Then the fun started, The hand controller took numerous reboots to finally show something other than ...main board failure... Emails back and forth., That night the 2-3-4-5 minute exposures pictures centered around Capella were elongated... emails back and forth. Turns out there are 11 bolts that were only near hand tight. A calibrated torque wrench solved those issues, can’t believe the mount left quality control with that issue, we fixed it, with emails back and forth. The mount is now really nice. Ioptron support was helpful with solving the issues. A new HC is on its way, fit and finish is exceptional and we are looking forward to some unguided shots.