iOptron CEM120EC

Name: iOptron CEM120EC
Brand: iOptron

iOptron

CEM120 is a GoTo equatorial mount for heavier or observatory-class deep-sky rigs.

mount flagship

Best Current Offer

Cloud Break Optics

In stock

$5,799.00

Other retailers

Mile High Astronomy (In stock)
$7,048.00
High Point Scientific (In stock)
$7,749.00
Telescopes.net (In stock)
$7,749.00

Specifications

Mount

Mount type: Center-balanced GoTo equatorial mount
Drive system: 360 teeth, Ø216 mm, zero backlash
Payload capacity: 115 lb (52 kg)
Mount weight: 57 lb (25.8 kg)
Counterweight: Ø38.1 x 540 mm (SS, none slip, 4.5 kg)
Latitude range: 0～68° (0.5 arc min devision)

Capacity

Payload-to-weight ratio: 2:1

Motion

Slew rate: 4°/sec (960x) max.
Tracking accuracy: <±3.5 arcsec, < 0.15 arcsec RMS (EC)
Encoder: CEM120 and the CEM120EC (The EC version has high resolution encoders for real time nearly error free tracking, the EC2 version has encoders on both axes)

Specifications

Power: DC 12V, 5A

Electronics

Controller: Go2Nova GoTo control with Wi-Fi variant support

Mechanical

Tripod / pier: Optional Pier

Astrophotography Fit

A heavy-payload mount that should be chosen by realistic imaging payload, not headline capacity alone.

CEM120 is a flagship GoTo equatorial mount for computerized tracking and guiding.

For long-exposure astrophotography, use a conservative imaging payload. The telescope, camera, guide hardware, dew heaters, dovetails, and cables all count, and guiding performance matters more than the catalog payload number.

Best paired with

Autoguided refractors or corrected reflectors within conservative payload limits
Stable tripod or pier and balanced counterweights
Computer or hand-controller workflow with good polar alignment

Not recommended for

Payloads at the rated maximum for imaging
Users who need an airline-portable rig above all else
Long focal length work without guiding and careful balance

Where To Buy

Some links on this page are affiliate links. Prices and availability are pulled automatically from each retailer and updated daily.

Retailer	Price	Availability	View Offer
Cloud Break Optics Cloud Break Optics	$5,799.00	In stock Updated 9/20/2026	View Offer - $5,799.00
Mile High Astronomy Mile High Astronomy	$7,048.00	In stock Updated 9/20/2026	View Offer - $7,048.00
High Point Scientific High Point Scientific	$7,749.00	In stock Updated 9/20/2026	View Offer - $7,749.00
Telescopes.net Telescopes.net	$7,749.00	In stock Updated 9/20/2026	View Offer - $7,749.00

Price History

Chronological retailer pricing with out-of-stock points shown at reduced opacity.

Cloud Break Optics High Point Scientific Mile High Astronomy