iOptron CEM40 Equatorial Mount with iPolar and 1.5" Tripod

iOptron CEM40 Equatorial Mount with iPolar and 1.5" Tripod

Due to high demand and global product shortages due to the pandemic, please call for availability.

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 1.5" heavy-duty stainless steel tripod (5kg)
  • 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: 1.5" Stainless Steel (5kg), 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.