iOptron CEM40 Center Balanced GoTo Equatorial Mount With 1.75" LiteRoc Tripod

Be the first to review this product


Availability: In stock

Introducing the CEM40 next-generation, center-balance equatorial mounts. The CNC body looks sharp however, its beauty is more than skin deep.

Our Product #: CEM402
iOptron Product #: C401A3

Product Description

Introducing the CEM40 next-generation, center-balance equatorial mounts. The CNC body looks sharp however its beauty is more than skin deep. The head weighs in at only 15.8 lbs. yet can support a payload of up to 40 lbs. An integrated electronic polar finder scope (iPolar) ensures accurate alignment even at times when the pole star is obscured.  Large levers on its quick-lock drive engagement system make it easy to snap its gears into place even when wearing gloves. There's little chance of your cables getting snagged with the CEM40's internal cable management system.  The CEM40  incorporates our new, patent- pending Universal Self-Centering Saddle (USCS) it accommodates Losmandy and Vixen style dovetail plates. The CEM40 utilizes our ultra-quiet low power consumption stepper motor drive systems. Other features such as onboard GPS, 359,000+ object library with star identification make this an extremely portable and capable mount a sure winner.  

• Unique design, center-balanced equatorial mount (CEM)
• Ideal for both visual observation and astrophotography
• Large easy to use quick-lock gear clutches
• Integrated iPolar™ electronic polar finder
• Max payload of 40 lbs (18 kg) with the mount weight of only 15.8 lbs (7.2 kg)
• Precision stepper motor for precise GOTO and accurate tracking
• Go2Nova® 8407+ controller with advanced GOTONOVA ® GOTO technology with built in heater
• Permanent periodic error correction (PPEC) on the CEM40 or real time PEC (RPEC) for the CEM40EC
• Built-in 32-channel Global Positioning System (GPS)
• Integrated ST-4 auto guiding port
• Advanced cable management system with more choices
• New, patent-pending iOptron universal self centering saddle
• WiFi with optional external adapter
• CNC machined metal body
• Includes 1.75" LiteRoc tripod, optional Tri-Pier availible





Mount Type


Payload (excl. CW)

18 kg (40 lbs), exclude counterweight

Mount Weight

7.2 kg (15.8 lbs)

Payload/Mount Weight


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


Tracking Accuracy (PE)

< ±7 arcsec / < 0.25 arcsec RMS (EC)


400 sec

Worm diameter

17 mm

Right Ascension Worm Wheel

216 teeth, Ø110 mm, zero backlash

Declination Worm Wheel

216 teeth, Ø110 mm, zero backlash

Right Ascension Axle

Ø45 mm, steel

Declination Axle

Ø45 mm, steel

Right Ascension Bearings

Ø68 mm

Declination Bearings

Ø68 mm

Counterweight Shaft

Ø20 x 410 mm (SS, 1 kg)


4.5 kg (10 lbs) x1

Mounting Base Diameter



precision stepper motor, 1.8°/128 micor-step

Motor Resolution

0.08 arcsec (200 PPS)

Hand Controller

Go2Nova 8407+; 8 line 21 character LCD

Star Database

359,000+, star identification


DC 12V, 5A

Power Consumption

0.6A (tracking), 0.9A (GOTO)

Polar Scope

Internal iPolar eletronic 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)


PPEC/Real time PEC (CEM40EC)

Guiding Port


Communication Port





External (optional)

Cable Management

DC12V (3A), ST4,USB



Hard case

CEM40EC standard, CEM40 optional

Tech Details


How do you rate this product? *