iOptron CEM25P Equatorial Mount with 1.5" Tripod

iOptron CEM25P Equatorial Mount with 1.5" Tripod

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

The next step up of CEM25 – Low Periodic Error CEM25P!

The CEM25P has all of the features of the CEM25 and now has a guaranteed low periodic error of ~+/- 10 arcseconds or less. The improved tracking accuracy is a product of tighter production tolerances. It also features larger gear switches on both axes, making access and adjustment easier, especially when wearing light gloves.

The Center-balanced Equatorial Mount (CEM), a mount whisper quiet and light weight, uses up to 60% less GOTO power consumption than other mounts in its category.

The "Z" design mount puts the weight of the payload at the center of gravity, affording greater natural stability. Given its payload capacity, this means the "Z" designed mount is unusually light, a nice benefit when setting up at a remote site. Other features include an adjustable counterweight bar to prevent obstruction with the tripod. And polar aligning is quick and accessible all the time since the polar scope is not blocked by the declination shaft.

The CEM25P is equipped with the latest advanced GOTONOVA® GOTO technology, making it one of the most powerful and accurate GOTO mounts available. Its database includes over 150,000+ objects. The Go2Nova® Hand Controller is intuitive to use, and its large, 4-line LCD screen simplifies the process of setting telescopes and locating objects.


  • A new design Center-Balanced equatorial mount for maximum payload at minimum mount weight
  • Specialized astrophotography mount ideal for entry-level and intermediate astro-imagers
  • Low periodic error (< ± 10 arcseconds)
  • Payload of 12.3kg (27 lbs) with the mount-only weight of 4.7kg (10.4 lbs)
  • Spring loaded gear system with customer-adjustable loading force
  • Gear switches on both R.A. and DEC axes for easy balancing when disengaged
  • Adjustable counterweight shaft for 0° latitude operation
  • Stepper motor with low power consumption
  • New electronics and control adapter from CEM60
  • iOptron AccuAlign™ calibrated polar scope with dark-field illumination and easy polar alignment procedure, allowing for fast and accurate polar alignment
  • Polar alignment routine for those who can’t see the Pole Star
  • Go2Nova® 8408 controller with Advanced GOTONOVA® GOTO Technology
  • Integrated ST-4 autoguiding port
  • Built-in 32-channel Global Positioning System (GPS)
  • Serial port for firmware upgrade and computer control
  • Spring loaded Vixen-style (44mm) saddle
  • Standard 1.5" heavy-duty stainless steel tripod (5kg)
  • Die-cast metal tripod spreader with accessory tray
  • Optional PowerWeight™ rechargeable battery pack
  • Optional StarFi WiFi adaper for full function control via SmartPhone/Tablet/Computer


  • Mount: Center-Balanced Equatorial Mount
  • Payload: 12.3kg (27 lb), exclude counterweight
  • Mount weight: 4.7kg (10.4 lb)
  • Payload:Mount weight ratio: 2.60:1
  • Periodic error (PE) *:
  • Right Ascension worm wheel: 88mm diameter, 144 teeth aluminum
  • Declination worm wheel: 88mm diameter, 144 teeth aluminum
  • Right Ascension axis shaft: 35mm diameter steel
  • Declination axis shaft: 35mm diameter steel
  • Right Ascension bearing: 55mm diameter ball bearing
  • Declination bearing: 55mm diameter ball bearing
  • Worm gears: 15.2mm diameter, Brass
  • Motor drive: 1.8° stepper motor, 128X microdivision
  • Resolution: 0.17 arc seconds
  • Transmission: Synchronous belt
  • Latitude adjustment range: 0° ~ 60°
  • Azimuth adjustment range: ± 10°
  • GPS: Internal 32-channel GPS
  • Polar Scope: AccuAlign&trade dark field illuminated
  • Level indicator: Level bubble
  • Hand Controller: Go2Nova® 8408 with 150,000+ objects database
  • PEC: Yes
  • Tracking: Automatic
  • Slew speed: 1×,2×,8×,16×,64×,128×,256×,512×,MAX(4°/sec)
  • Power consumption: 0.35A (Tracking), 0.6A (GOTO)
  • Power requiremention: 12V DC (9 ~ 15V), 1.5Amp
  • AC adapter: 100V ~ 240V (included)
  • Power-down memory: Yes
  • Serial port: Yes (on hand controller)
  • Autoguide port: Yes
  • Firmware upgrade: Yes
  • PC computer control: Yes (ASCOM)
  • Counterweight shaft: 20mm diameter, Stainless Steel
  • Counterweight: 4.7kg (10.4 lb)
  • Tripod: 1.5" Stainless Steel (5kg)
  • Dovetail saddle: Spring loaded Vixen-style
  • Operation temperature: -10°C ~ 40°C
  • Warranty: Two year limited

* Measured with encoder, 10 minutes.