iOptron CEM120EC2

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Product Overview

Introducing the new iOptron CEM120EC center balance equatorial mount.

Recognizing the growing demand for an accurate and stable, equatorial mount with the versatility to carry larger instruments and more complex imaging arrays, we created the iOptron CEM120. It offers the benefits of our revolutionary “center balance” design: stability, accuracy, and smooth mechanical operation, while capable of carrying a payload up to 115lbs (52 kg). The “center balance” design’s natural stability is due to its focusing the mount along with payloads weight directly over the center of the pier or tripod. The CEM120s performance is demonstrated by its low periodic tracking error of <0.15 arc sec RMS with the EC model. Along with the stability aspect, the CEM120 features an advanced cable management system consisting of more ports in more locations preventing tangle ups and reducing the chance of fractured cables. It also adds some new features to the CEM family like Wi-Fi and LAN for remote operation and easy to use, reliable clutches on both axes.

The CEM120EC2 utilizes two high resolution encoders, one on each axis. The two encoders enable the mount to perform dual axes tracking. With advanced sky modeling the CEM120EC2 will be able to account and adjust for polar alignment error as well as changes in atmospheric (refractive) distortion. Fixed home sensors on each axis, allow the mount to save alignment models after power off too to be used on future nights.


  • A new design, center-balanced equatorial mount (CEM) for maximum payload with natural stability
  • Observatory astrophotography mount ideal for both visual observation and Astrophotography
  • Payload of 115 lbs (52 kg) with the mount weight of 57 lbs (26 kg)
  • Easy to use and reliable gear clutches
  • Adjustable counterweight shaft for 0º latitude operation
  • Precision altitude and azimuth adjustment.
  • Precision stepper motor with 0.07 arcsec accuracy for precise GOTO and accurate tracking
  • Polar alignment routine for those who can't see the Pole Star
  • Go2Nova® 8407+ controller with Advanced GOTONOVA® GOTO Technology with built in heater
  • Deual high precision encoders on both RA and DEC
  • Real time PEC (RPEC)
  • Built-in 32-channel Global Positioning System (GPS)
  • Built-in Wi-Fi and LAN for remote operation
  • Integrated ST-4 auto guiding port
  • Advanced cable management system with more choices
  • Spring loaded, individual adjustable Losmandy style saddle


MountCenter-balanced Equatorial Mount (CEM)
Payload52kg (115 lbs), exclude counterweight*
Mount weight26kg (57 lbs)
Payload/Mount weight ratio2
MaterialAll metal
Latitude adjustment range0°~ 68° (0.5 arcmin division)**
Azimuth adjustment range± 5° (3 arcmin division)
Tracking accuracy (PE)< 0.15 arcsec RMS
Worm period240 sec
PECReal time PEC (RPEC)
Right Ascension worm wheelF216mm, 360 teeth, zero backlash
Declination worm wheelF216mm, 360 teeth, zero backlash
Right Ascension axleF80mm, steel
Declination axleF80mm, steel
Right Ascension bearingsF125mm
Declination bearingsF125mm
Counterweight shaftF38.1x 540 mm (SS, anti-slip, 4.5kg)
Counterweight10 kg (22 lbs)
Mount base size210 x 230 mm
Motor drivePrecision stepper motor w/128 micro-step
Encoder Resolution0.035 arc seconds
Motor Resolution0.07 arc seconds
Slew speed4°/sec (960x) max.
Hand ControllerGo2Nova® 8407 V2, 8 line 21 character LCD
Power requirementDC 12V, 5A
Power consumption0.7A(Tracking),1.8A(GOTO)
Polar ScopeOptional electronic polar scope
Meridian treatmentStop (0-14° pass), auto flip
Zero positionAutomatic zero search
Park positionHorizontal, vertical, current, alt/azi input
Level indicatorYES
Dovetail saddleLosmandy D, 17.2" (437mm)
Guiding portST-4
Communication portRS232, USB, LAN, WiFi
Cable management2xDC12V (1A), DC5V(1A), 2xDC (5A), ST4, 6P6C, 4xUSB2.0, USB3.0 (powered), USB for PS, AUX
Pier/TripodOptional pier
WarrantyTwo year limited
* These are only guidelines. Some telescopes are very long or very big for their weight and may require a larger mount. Remember also that imaging requirements are more rigid than visual observation. 
** If you latitude is <10°,please contact iOptron for special CW mounting house.


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