iOptron CEM120
iOptron
CEM120 is a GoTo equatorial mount for heavier or observatory-class deep-sky rigs.
mount flagship
Best Current Offer
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 |
|---|---|---|---|
| Mile High Astronomy Mile High Astronomy | $5,128.00 | In stock Updated 5/12/2026 | View Offer - $5,128.00 |
| Cloud Break Optics Cloud Break Optics | $5,649.00 | In stock Updated 5/14/2026 | View Offer - $5,649.00 |
| High Point Scientific High Point Scientific | $5,649.00 | In stock Updated 5/13/2026 | View Offer - $5,649.00 |
| Telescopes.net Telescopes.net | $5,649.00 | In stock Updated 5/14/2026 | View Offer - $5,649.00 |