iOptron CEM120 EC2 Center Balanced EQ Mount With Dual High Precision Encoders
iOptron
iOptron CEM120 EC2 Center Balanced EQ Mount With Dual High Precision Encoders is a GoTo equatorial mount for heavier or observatory-class deep-sky rigs.
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Specifications
Mount
- Mount type
- Center-balanced GoTo equatorial mount
- Drive system
- 240 sec
- Payload capacity
- 115 lb (52 kg)
- Mount weight
- 57 lb (25.8 kg)
- Counterweight
- Φ38.1x 540 mm (SS, anti-slip, 4.5 kg)
- Latitude range
- 0°~ 68° (0.5 arcmin division)**
Capacity
- Payload-to-weight ratio
- 2:1
Motion
- Slew rate
- Up to 4°/sec
- Tracking accuracy
- < 0.15 arcsec RMS
- Periodic error
- < 0.15 arcsec RMS
- Encoder
- High-precision encoders on both axes
Electronics
- Controller
- Go2Nova GoTo control with Wi-Fi variant support
- Power
- 12V DC, 5A (0.7A tracking, 1.8A slewing)
Mechanical
- Tripod / pier
- Optional pier
Astrophotography Fit
A heavy-payload mount that should be chosen by realistic imaging payload, not headline capacity alone.
iOptron CEM120 EC2 Center Balanced EQ Mount With Dual High Precision Encoders 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 | $5,649.00 | In stock Updated 5/14/2026 | View Offer - $5,649.00 |
| Mile High Astronomy Mile High Astronomy | $8,698.00 | In stock Updated 5/12/2026 | View Offer - $8,698.00 |
| Astronomics Astronomics | $9,569.00 | In stock Updated 5/11/2026 | View Offer - $9,569.00 |