iOptron CEM120EC Equatorial Mount


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SKU: 7301


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    iOptron CEM120EC Equatorial Mount

    ** iOptron mounts are generally available 3-4 weeks from order, possibly sooner.  Contact BINTEL for details. **

    CEM 120EC

    Hi Res Encoders on RA Axis

    High Precision Tracking and Pointing

    The All NEW iOptron CEM120EC

    An extraordinary innovation in mount design…Now with a new payload!

    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 CEM120EC. It offers the benefits of our revolutionary “center balance” design: stability, accuracy, and smooth mechanical operation, while capable of carrying a payload up to 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 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.

    Optional Extra’s

    Optional heavy duty Tri-Pier 360 and Permanent Pier are available for order.


    Optional Tri-Pier adapter for light weight payload ( 8036-120) is also available for $239. It can be modified for permanent pier mounting.


    • 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
    • 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 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)
    • 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, individual adjustable Losmandy saddle


    Mount Center-balanced Equatorial Mount (CEM)
    Payload 52kg , exclude counterweight*
    Mount weight 26kg
    Payload/Mount weight ratio 2
    Material All metal
    Latitude adjustment range 0°~ 68° (0.5 arcmin division)**
    Azimuth adjustment range ± 5° (3 arcmin division)
    PE (by encoder) < 0.15 arcsec RMS***
    Worm period 240 sec
    PEC Real time PEC (RPEC)
    Right Ascension worm wheel Φ216mm, 360 teeth, zero backlash
    Declination worm wheel Φ216mm, 360 teeth, zero backlash
    Worm Φ26mm
    Right Ascension axle Φ80mm, steel
    Declination axle Φ80mm, steel
    Right Ascension bearings Φ125mm
    Declination bearings Φ125mm
    Counterweight shaft Φ38.1x 540 mm (SS, anti-slip, 4.5kg)
    Counterweight 10 kg
    Mount base size 210 x 230 mm
    Motor drive Precision stepper motor w/128 micro-step
    Encoder Resolution 0.035 arc seconds
    Motor Resolution 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 0.7A(Tracking),1.8A(GOTO)
    Polar Scope Optional electronic polar scope
    Meridian treatment Stop (0-14° pass), auto flip
    Zero position Automatic zero search
    Park position Horizontal, vertical, current, alt/azi input
    Level indicator YES
    Dovetail saddle Losmandy D, 17.2″ (437mm)
    Guiding port ST-4
    Communication port RS232, USB, LAN, WiFi
    Cable management 2xDC12V (1A), DC5V(1A), 2xDC (5A), ST4, 6P6C, 4xUSB2.0, USB3.0 (powered), USB for PS, AUX
    Pier/Tripod Optional pier
    Warranty Two year limited

    Supplied with an American power supply from factory 

    Manuals and Instructions

    Quick Start Guide

    Instruction Manual

    AUX port plug (DIN-422) assembly

    Latest Firmware

    SKU: 7301

    Have a question about this product?

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