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iOptron CEM120 (Pre-Order)



  • 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
  • High precision tracking with low periodic error (PE)<±3.5 arcsec
  • Permanent periodic error correction (PPEC)
  • 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
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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 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 115 lbs (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 CEM120's performance is demonstrated by its low periodic tracking error of ±3.5 arc seconds. 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.

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. It can be modified for permanent pier mounting.

PACKAGE CONTENTSBox 1 of 2: #7320

  • CEM120 mount head x1
  • Go2Nova 8407 V2 hand controller x1
  • Hand controller cable x1
  • Serial cable (#8412) x1

Box 2 of 2: #7325

  • Counterweight shaft x1
  • 10 kg counterweight x2
MountCenter-balanced Equatorial Mount (CEM)
Payload152kg (115 lbs), exclude counterweight
Mount weight26kg (57 lbs)
Payload/Mount weight ratio2
MaterialAll metal
Latitude adjustment range20°~ 68° (0.5 arcmin division)
Azimuth adjustment range± 5° (3 arcmin division)
PE (by encoder)3< ±3.5 arcsec
Worm period240 sec
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
Resolution0.07 arc seconds
Slew speed4°/sec (960x) max.
Hand ControllerGo2Nova® 8407 V2, 8 line 21 character LCD
Power requirement4DC 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
Operation temperature-10°C ~ +40°C
Pier/TripodOptional pier

1. OTA size and length dependent.
2. If you latitude is <10°,please contact iOptron for low latitude CW (#7326LL).
3. Measured with encoder on the bench, 240 seconds
4. Included AC adapter is for indoor use only

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iOptron CEM120 (Pre-Order)

KD 1,579.00