iOptron® CEM25EC with Hard Case       priced at $1,899.-


A Mount with PE Less Than 0.3 arcsec rms under $2000 - The New CEM25EC!

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

With high precision optical encoder system and advanced control technology, the CEM25EC will track a star at a periodic error less than 0.3 arc second, the only mount under $2000!

The "Z" design mount puts the weight of the payload at the center of gravity allowing for 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 CEM25 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 59,000 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.

The mount comes standard with 1.5" heavy duty stainless steel tripod and a hard carrying case.




A new design Center-Balanced equatorial mount for maximum payload and minimum mount weight

Specialized astrophotography mount ideal for entry-level and intermediate Astro-photographers

High precision optical encoder system and advance control technology for accurate tracking

PE<0.3 arc second RMS

Payload of 27 lbs (12.3 kg) with the mount-only weight of 10.4 lbs (4.7 kg)

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 0º latitude operation

Stepper motor with low power consumption

New electronics and control adapted from CEM60

iOptron AccuAlignTM 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 saddle

Standard 1.5 inch heavy-duty stainless steel tripod (5kg), optional 2 inch tripod (8kg)

Die-cast metal tripod spreader with accessory tray

Hard case included

Optional PowerWeightTM rechargeable battery pack

Optional StarFi WiFi adaper for full function control via SmartPhone/Tablet/Computer

Technical Specifications:



Mount weight

Payload/Mount weight

Right Ascension worm wheel

Declination worm wheel

Right Ascension axis shaft

Declination axis shaft

Right Ascension bearing

Declination bearing

Worm gears

Motor drive



Latitude adjustment range

Azimuth adjustment range


Polar Scope

Level indicator

Hand Controller


Periodic Error



Counterweight shaft



Dovetail saddle

Power consumption

Power requirement

AC adapter

Serial port

Autoguide port

Firmware upgrade

PC computer control

Operation temperature


Center-Balanced Equatorial Mount

27 lb (12.3kg), exclude counterweight

10.4 lb (4.7kg)


Φ88mm, 144 teeth aluminum

Φ88mm, 144 teeth aluminum

Φ35mm steel

Φ35mm steel

Φ55mm ball bearing

Φ55mm ball bearing


1.8 º stepper motor, 128X microdivision

0.14 arc seconds

Synchronous belt

0º ~ 60º

± 10º

Internal 32-channel GPS

AccuAlignTM dark field illuminated

Level bubble

Go2Nova® 8408with 59,000 objects database

Real Time PEC

<0.3 arcsec RMS




10.4 lb (4.7kg)

1.5" Stainless Steel(5kg), optional 2"(8kg)

Spring loaded Vixen-style


12V DC(9 ~ 15V), 1.5Amp

100V ~ 240V (included)

Yes (on hand controller)




-10ºC ~ 40ºC

Two year limited

iStar Optical and iOptron Mounts have partnered to create a winning combination.


A mount company that cares as much about quality as we do. We use the iOptrons personally. We now offer iOptrons mounts separately or as packages that include our scopes. Ask us about special pricing for complete packages including OTA, tube rings, dovetail and iOptrons mount.


Coming soon complete “Turn Key” packages for imaging including OTA, mount and guidescope.