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iOptron CEM70EC Goto EQ Mount


A center-balanced equatorial mount with electronic polar scope with up to 32kg payload

Following up on the success of the iOptron CEM60 centre balance equatorial mount, iOptron are excited to introduce two new medium payload centre balance mounts. The CEM70 series mounts are new standard bearers for equatorial mounts in the 70lb payload segment.

Retaining the inherent properties of the center balance design, these relatively compact medium payload mounts deliver what astronomers expect in an efficient accurate portable mount. With precise GOTO pointing and accurate tracking, the CEM70EC is a solid performer for observers and imagers alike.

Innovative operational features such as the internal iPolar electronic polar scope, easy lock drive gear engagement (levers large enough to use with gloves), an advanced cable management system for the mount, iPolar and camera cumulatively assure users the CEM70 designed with their needs in mind.

(Tripod/Pier not included.)

MountCenter-balanced Equatorial Mount (CEM)
Payload31.8kg, excluding counterweight*
Mount weight13.6kg
Payload/Mount weight ratio2.33
MaterialAll metal
Latitude adjustment range0°~ 65°
Azimuth adjustment range± 4°
PE (by encoder)< ±0.3 arcsec**
Worm period348 sec
Right Ascension worm wheelΦ151mm, 248 teeth
Declination worm wheelΦ151mm, 248 teeth
Right Ascension axleΦ55mm, steel
Declination axleΦ55mm, steel
Right Ascension bearingsΦ80mm
Declination bearingsΦ80mm
Counterweight shaftΦ28x 415 mm (SS, 1.9kg)
Counterweight9.5 kg (20 lbs) x1
Mount base sizeΦ152mm
Motor drivePrecision stepper motor w/128 micro-step
Resolution0.07 arc seconds
Slew speed3.75°/sec (900x) max.
Hand ControllerGo2Nova® 8407+, 8 line 21 character LCD
Power requirementDC 12V, 5A (5.5mm/2.5mm plug)
Power consumption0.6A(Tracking),0.8A(GOTO)
Polar ScopeInternal electronic polar scope, iPolar
Meridian treatmentStop (0-10° pass), auto flip
Zero positionAutomatic zero search
Park positionHorizontal, vertical, current, alt/azi input
Level indicatorYES
Dovetail saddle8" Losmandy D & Vixen
Guiding portST-4
Communication portUSB2.0
Cable management2xDC12V (3A), 3xUSB2.0, 1xDC in/1xDC out, iPort.
1X USB input for mount and USB hub
Operation temperature range-20°C ~ +45°C
Hard caseYES
Pier/TripodOptional LiteRoc tripod or pier
WarrantyTwo year limited

* OTA size and length dependent.
** Measured with encoder on the bench, 348 seconds

  • A new design, center-balanced equatorial mount (CEM) for maximum payload with natural stability
  • Ideal for both visual observation and astrophotography
  • Payload of 31.8 kg with the mount weight of 13.6 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
  • iPolarTM electronic polar scope
  • 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)
  • USB connection
  • Integrated ST-4 autoguiding port
  • Advanced cable management system with more choices
  • Spring loaded 8" Vixen/Losmandy dual 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.