iOptron CEM120EC GoTo EQ Mount

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The innovative mount with high precision encoders, for larger telescopes.

Recognising the growing demand for an accurate and stable equatorial mount with the versatility to carry larger instruments and more complex imaging arrays, iOptron has created the CEM120EC. It offers the benefits of the centre balance design: stability, accuracy, and smooth mechanical operation, while being capable of carrying a payload up to 52 kg. The centre balance design's natural stability is due to its focusing the mount along with the payload's weight directly over the centre of the pier or tripod.

The CEM120EC's performance is demonstrated by its low periodic tracking error of <0.15 arcsec RMS. Along with the stability aspect, the CEM120EC 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.

This mount is available to order.
Please contact us for current pricing and delivery times

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MountCenter-balanced Equatorial Mount (CEM)
Payload52kg, excluding counterweight*
Mount Weight26kg
Payload/Mount Weight Ratio2:1
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)
RA & Dec Worm WheelΦ216mm, 360 teeth, zero backlash
WormΦ26mm
RA & Dec AxleΦ80mm, steel
RA & Dec BearingsΦ125mm
Counterweight ShaftΦ38.1x 540 mm (SS, anti-slip, 4.5kg)
Counterweight10kg
Mount Base Size210 x 230mm
Motor DrivePrecision stepper motor w/128 micro-step
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 ScopeNot Included
Meridian TreatmentStop (0-14° pass), auto flip
Zero PositionAutomatic zero search
Park PositionHorizontal, vertical, current, alt/azi input
Level IndicatorYes
Dovetail SaddleLosmandy D, 437mm
GPSYes
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. Imaging requirements are more rigid than visual observation.

  • A new design, center-balanced equatorial mount (CEM) for maximum payload with natural stability
  • Observatory astrophotography mount ideal for both visual and astro-photographers
  • Payload of 52 kg with the mount weight of 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 SCP
  • Go2Nova® 8407 V2 controller with Advanced GOTONOVA® GOTO Technology with built-in heater
  • High precision tracking with low periodic error (PE) <0.15 arcsec RMS
  • Real-time periodic error correction (RPEC)
  • Built-in 32-channel Global Positioning System (GPS)
  • Built-in WiFi and LAN for remote operation
  • Integrated ST-4 autoguiding port
  • Advanced cable management system with more choices
  • Spring-loaded, individually adjustable Losmandy saddle
  • 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