iOptron CEM120EC2 Equatorial Mount

Brand: iOptron
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Brand: iOptron
SKU: 7302
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Not currently in stock. You can backorder now, but product will be delayed by two weeks or more due to global logistics.

For better availability information call 02 9518 7255 or email


The All NEW iOptron CEM120EC2

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 CEM120EC2. 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. 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. They also add 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.

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 115 lbs (52 kg) with the mount weight of 57 lbs (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
  • Dual high precision encoders on both RA and DEC
  • 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


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)
PE (by encoder)< 0.15 arcsec RMS***
Worm period240 sec
PECReal time PEC (RPEC)
Right Ascension worm wheelΦ216mm, 360 teeth, zero backlash
Declination worm wheelΦ216mm, 360 teeth, zero backlash
Right Ascension axleΦ80mm, steel
Declination axleΦ80mm, steel
Right Ascension bearingsΦ125mm
Declination bearingsΦ125mm
Counterweight shaftΦ38.1x 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 Years Limited

Manuals and Instructions

Quick Start Guide

Instruction Manual

AUX port plug (DIN-422) assembly

Latest Firmware

SKU: 7302

iOptron CEM120EC2 Equatorial Mount

SKU: 7302

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

iOptron CEM120EC

With hi res encoders on RA Axis for precision pointing and tracking.

Mount has 52kg capacity.







Have a question about this product?

    CALL NOW : +61 2 9518 7255 OR EMAIL BELOW


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