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iOptron CEM120 Goto EQ Mount


The innovative mount for larger telescopes

Recognizing 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 CEM120. It offers the benefits of their “center balance” design: stability, accuracy, and smooth mechanical operation, while being capable of carrying a payload up to 52 kg. The “center balance” design’s stability is due to its focusing the mount along with the payload's weight directly over the center of the pier or tripod.

The CEM120's performance is demonstrated by its low periodic tracking error of ±3.5 arc seconds. Along with the stability aspect, it 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.

What's In the Box?
  • CEM120 mount head x1
  • Go2Nova 8407 V2 hand controller x1
  • 10 kg counterweight x2
  • Counterweight shaft x1
  • Hand controller cable x1
  • Serial cable (#8412) x1
  • MountCenter-balanced Equatorial Mount (CEM)
    Payload52kg, excluding counterweight*
    Mount Weight26kg  
    Payload/Mount weight2:1 
    MaterialAll Metal 
    Latitude adjustment range0°~ 68° (0.5 arcmin division)  
    Azimuth adjustment range± 5° (3 arcmin division)
    Tracking accuracy (PE)< ±3.5 arcsec
    Worm Period240 sec
    RA & Dec worm wheelΦ216mm, 360 teeth, zero backlash
    RA & Dec AxleΦ80mm, steel
    RA & Dec BearingsΦ125mm
    Counterweight shaft
    Φ38.1x 540 mm (SS, anti-slip, 4.5kg)
    Mount base size
    210 x 230mm
    Motor drive
    Precision stepper motor w/128 micro-step
    0.07 arc seconds
    Slew speed
    4°/sec (960x) max.
    Hand Controller
    Go2Nova® 8407 V2, 8 line 21 character LCD
    Power requirement
    DC 12V, 5A
    Power consumption
    Polar Scope
    Not Included
    Meridian treatment
    Stop (0-14° pass), auto flip
    Zero PositionAutomatic zero search
    Park PositionHorizontal, vertical, current, alt/azi input
    Level IndicatorYes
    Dovetail saddle
    Losmandy D, 437mm
    Guiding PortST-4
    Communication portRS232, USB, LAN, WiFi
    Cable management
    2xDC12V (1A), DC5V(1A), 2xDC (5A), ST4, 6P6C,
    4xUSB2.0, USB3.0 (powered), USB for PS, AUX
    Optional pier
    Two 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.

    • 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)<±3.5 arcsec
    • Permanent periodic error correction (PPEC)
    • Built-in 32-channel 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

    This product is normally shipped by our freighter service.

    Normal delivery is to pickup from their local depot or for delivery to a business address in main towns or cities.

    Delivery to a residential address will incur a $45.00 surcharge.

    Delivery to a small town or rural address may not be available. We will contact you separately to arrange shipping.