iOptron CEM70 Center Balanced Equatorial GoTo Mount
iOptron CEM70 Center Balanced Equatorial GoTo MountiOptron CEM70 Center Balanced Equatorial GoTo MountiOptron CEM70 Center Balanced Equatorial GoTo MountiOptron CEM70 Center Balanced Equatorial GoTo Mount

iOptron CEM70 Center Balanced Equatorial GoTo Mount

  (4 Reviews)
✓ 2 year warranty


Out of stock due 10-15 working days

About this product

Model:  iop_cem70_C70A
Part Number:  C70A

Building on the success of the iOptron CEM60 centre balance equatorial mount, iOptron have introduced the new CEM70.

Retaining the inherent properties of the centre balance design, this relatively compact mount provides an impressive 70 lbs (31.8 kg) payload capacity, precise GOTO pointing and accurate tracking (PE <±3.5 arc-sec) so will appeal to both both visual astronomers and astrophotographers. 

An impressive features list includes an internal iPolar electronic polar scope and easy lock drive gear engagement (levers large enough to use with gloves).

It also features an advanced cable management system for the mount, iPolar, guider, and camera. 

Note: The tripod/pier shown in photos not included but is available separately. 


  • A new design, center-balanced equatorial mount (CEM) for maximum payload with natural stability
  • Ideal for both visual observation and astrophotography
  • Payload of 31.8kg / 70lbs with the mount weight of 13.6kg / 30lbs
  • 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
  • iPolar 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
  • Hard case

Go2Nova Hand Controller 8407

  • 200,000+ object database
  • 8 line, 21 character back lit large screen LCD
  • Low temperature operation as low as -20ºC
  • User friendly interface
  • 9 speed slew control with quiet mode
  • Large object database
  • Serial port for firmware upgrade


What's in the box

  • Mount head – with iPolar electronic Polar Scope
  • Hand Controller (HC) – Go2Nova® 8407+
  • Counterweight – 21 lbs (9.5 kg)
  • Stainless steel counterweight shaft
  • Built-in GPS module
  • Hand controller coiled cables
  • USB cable
  • AC adapter – 100-240V (DC output 12V/5A)
  • Hard case
  • Quick Start Guide
  • Tripod NOT included 


Mount Center-balanced Equatorial Mount (CEM)
Payload 31.8kg (70lbs), exclude counterweight*
Mount weight 13.6kg (30lbs)
Payload/Mount weight ratio 2.33
Material All metal
Latitude adjustment range 0°~ 65°
Azimuth adjustment range ± 4°
PE (by encoder) < ±3.5 arcsec**
Worm period 348 sec
Right Ascension worm wheel Φ151mm, 248 teeth
Declination worm wheel Φ151mm, 248 teeth
Worm Φ21.2mm
Right Ascension axle Φ55mm, steel
Declination axle Φ55mm, steel
Right Ascension bearings Φ80mm
Declination bearings Φ80mm
Counterweight shaft Φ28x 415 mm (SS, 1.9kg)
Counterweight 9.5 kg (20 lbs) x1
Mount base size Φ152mm
Motor drive Precision stepper motor w/128 micro-step
Resolution 0.07 arc seconds
Slew speed 3.75°/sec (900x) max.
Hand Controller Go2Nova® 8407+, 8 line 21 character LCD
Power requirement DC 12V, 5A (5.5mm/2.5mm plug)
Power consumption 0.6A(Tracking),0.8A(GOTO)
Polar Scope Internal electronic polar scope, iPolar
Meridian treatment Stop (0-10° pass), auto flip
Zero position Automatic zero search
Park position Horizontal, vertical, current, alt/azi input
Level indicator YES
Dovetail saddle 8" Losmandy D & Vixen
Guiding port ST-4
Communication port USB2.0
Cable management 2xDC12V (3A), 3xUSB2.0, 1xDC in/1xDC out, iPort.
1X USB input for mount and USB hub
Operation temperature range -20°C ~ +45°C
Hard case YES
Pier/Tripod Optional LiteRoc tripod or pier
Warranty Two year limited


* iOptron's quoted max' payload is a guide only. If you will be using the mount for astrophotography (or your telescope is unusually long or large) we recommend the quoted max' payload be reduced by 1/3rd. 

Downloads / Manuals


Quick Start Guide 
Instruction Manual 
iPolar Operation Manual 


Download Latest Firmware 
iPolar Software 
FTDI VCP Driver, or go to FTDI Chip website to download the VCP driver

iOptron Telescope ASCOM Driver:

Install ASCOM Driver and Commander 

Customer reviews

Average Rating (4 Reviews):  
Write a Review and share your opinions!

Rating (max 5):  
CEM70 and FLO
08 July 2022  | 

Originally bought the CEM70 from FLO more than 18 months ago. It was one of the earlier made models. An initial problem was with the Ipolar. FLO efficiently and quickly sorted that problem out. Gradually - and after eliminating many other possible causes - a further subtle problem with oscillation in the RA axis emerged. Again FLO were superb - they fully engaged with the problem, agreed to take the mount back back and quickly sorted out a solution with Ioptron. I now have a mount back and the problem has gone away . So the five stars are firstly for FLO and their customer service. But secondly - with its problems now resolved (which may have been more frequent in early models?) - the CEM70 is in fact a very capable and convenient mount - relatively light and transportable and yet capable of taking imaging loads up to 20kg or so - and also capabl;e of PHD2 guiding at < 0.5 arcsec RMS under good conditions.

Rating (max 5):  
Solid mount
25 December 2020  | 

Only just setup on pier but initial test looking good. Thought my CEM40 was solid but this is a massive step-up in comparison. Great service as usual from FLO especially in these difficult times

Rating (max 5):  
14 November 2020  | 

Perfect and smooth purchase from FLO. Highly recommended. Mount works as expected

Rating (max 5):  
Ioptron CEM70
18 August 2020  | 

I got first class service from First Light Optics.
Consider me and my friends as regular customers, we will be back !
T Nordberg


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