iOptron CEM40 Equatorial Mount with iPolar and 2" Tripod

iOptron CEM40 Equatorial Mount with iPolar and 2" Tripod


The iOptron® CEM40 mount is the next generation of center-balanced equatorial mounts. This mount is incredibly eye-pleasing, and its beauty is found in more than its appearance. The functionality of the mount is superb. Weighing in at only 15.8lbs., this mount can support a payload of up to 40lbs.! That's incredible!

This mount also has an integrated electronic polar finder scope known as the iPolar. This tool ensures the accurate alignment of a telescope, even when the pole star is obscured. There are large levers on the quick-lock drive engagement system; these large levers make it easy to snap the gears into place.

Innovative iOptron Technology

Make way for an innovative mount! This iOptron CEM40 mount uses iOptron's patent-pending Universal Self-Centering Saddle (USCS). This saddle accommodates Losmandy and Vixen-style dovetail plates. The CEM40 also uses iOptron's ultra-quiet, low-power consumption stepper motor drive system, aiding the mount in providing precise tracking.

Computerized Mount Features

The iOptron CEM40 mount uses the Go2Nova® 8407 hand controller to navigate the night sky. This incredible technology helps observers find celestial objects with the aid of the mount's 212,000+ object database! For those looking for a telescope that has the capability of tracking and finding beautiful night sky objects, this mount is a must have tool.

With the included tripod, 10-pound counterweight, and the mount's computerized technology, observers are just an OTA away from a spectacular viewing experience!


  • Unique design, Center-Balanced equatorial mount (CEM) for maximum payload and minimum mount weight
  • Idea for both visual observation and astrophotography
  • Maximum payload of 18kg (40 lbs) with the mount weight of only 7.2kg (15.8 lbs)
  • All metal, CNC machined with red/black anodizing
  • Easy to use quick-lock gear clutches
  • Integrated iPolar™ electronic polar finder
  • Low periodic error (< ± 7 arc seconds)
  • Permanent periodic error correction (PPEC)
  • Precision stepper motor for precise GOTO and accurate tracking
  • Go2Nova® 8407+ controller with Advanced GOTONOVA® GOTO Technology with built-in heater
  • Integrated ST-4 autoguiding port
  • 32-channel Global Positioning System (GPS)
  • USB communication port
  • Cable management system
  • New, patent-pending iOptron universal saddle
  • Standard 2" heavy-duty stainless steel tripod (8kg)
  • Optional hard case
  • Optional WiFi for mount control via SmartPhone/Tablet/Computer


  • Mount: Center-Balanced Equatorial Mount
  • Max payload*: 18kg (40 lb), exclude counterweight
  • Mount weight: 7.2kg (15.8 lb)
  • Payload:Mount weight ratio: 2.5:1
  • Structure Material: All metal, CNC machined
  • Exterior Finish: Anodized red/black
  • Latitude adjustment range: 0° ~ 60°(special CW shaft mounting if <10° )
  • Azimuth adjustment range: ± 6°
  • Tracking accuracy (PE)**:
  • Period: 400 sec
  • Worm diameter: 17mm diameter, Brass
  • Right Ascension worm wheel: 110mm diameter, 216 teeth, zero backlash
  • Declination worm wheel: 110mm diameter, 216 teeth, zero backlash
  • Right Ascension axis shaft: 45mm diameter steel
  • Declination axis shaft: 45mm diameter steel
  • Right Ascension bearings: 68mm diameter
  • Declination bearings: 68mm diameter
  • Counterweight shaft: 20mm diameter X 410mm, Stainless Steel (1 kg)
  • Counterweight: 4.5kg (10lbs) X1
  • Motor: Precision stepper motor, 1.8°/128X micro-step
  • Motor resolution: 0.08 arcsec (200 PPS)
  • Transmission: Synchronous belt
  • Hand Controller: Go2Nova® 8407+, 8 line 21 character LCD
  • Star Database: 212,000+, star identification
  • Power: DC 12V, 5A
  • AC adapter: 100V ~ 240V (included)
  • Power consumption: 0.6A (Tracking), 0.9A (GOTO)
  • Power-down memory: Yes
  • Polar scope: Internal iPolar TM electronic polar scope
  • Meridian treatment: Stop (0-10° pass), flip
  • Zero position: Automatic zero search
  • Dovetail saddle: iOptron Universal Saddle, 5"
  • Max slew speed: 4.5°/sec (1080x)
  • Guiding port: ST-4
  • Communication port: USB
  • GPS: Yes
  • WiFi: External (optional)
  • Cable Management: DC12V, ST4,USB
  • Tripod: 2" Stainless Steel (8kg), optional 2" or tri-pier
  • Hard case: Optional
  • Operation temperature: -10ºC ~ 40ºC
  • Warranty: Two year limited

* OTA size and length dependent.
** Measured with encoder, 400 seconds.