Description
>Saddle
Observing Tip
For imagers with ultra-fine pixel scales (under 1 arcsecond/pixel), the CEM120EC’s high-resolution encoders allow for unguided imaging that rivals guided performance on lesser mounts. This is especially useful when imaging targets across the meridian or in tight imaging windows. If you’re using adaptive optics or frequent meridian flips, the precise mechanical repeatability of the CEM120EC saves precious setup time and prevents mid-session drift.
Final Thoughts
The iOptron CEM120EC is a purpose-built mount for those who demand the most from their equipmentwhether youre managing an institutional observatory or a private imaging pier. With real-time error correction, massive payload support, intelligent cable routing, and complete remote access, its a professional-grade tool priced within reach of serious amateurs. In a world of compromise, this is the exception.
Tech Details:
| Mount | Center-balanced Equatorial Mount (CEM) |
| Payload1 | 52kg (115 lbs), exclude counterweight |
| Mount weight | 26kg (57 lbs) |
| Payload/Mount weight ratio | 2 |
| Material | All metal |
| Latitude adjustment range2 | 0~ 68 (0.5 arcmin division) |
| Azimuth adjustment range | 5 (3 arcmin division) |
| PE (by encoder)3 | < 0.15 arcsec RMS |
| Worm period | 240 sec |
| PEC | Real time PEC (RPEC) |
| Right Ascension worm wheel | 216mm, 360 teeth, zero backlash |
| Declination worm wheel | 216mm, 360 teeth, zero backlash |
| Worm | 26mm |
| Right Ascension axle | 80mm, steel |
| Declination axle | 80mm, steel |
| Right Ascension bearings | 125mm |
| Declination bearings | 125mm |
| Counterweight shaft | 38.1x 540 mm (SS, anti-slip, 4.5kg) |
| Counterweight | 10 kg (22 lbs) |
| Mount base size | 210 x 230 mm |
| Motor drive | Precision stepper motor w/128 micro-step |
| Encoder Resolution | 0.035 arc seconds |
| Motor Resolution | 0.07 arc seconds |
| Slew speed | 4/sec (960x) max. |
| Hand Controller | Go2Nova 8410, 8 line 21 character LCD |
| Power requirement4 | DC 12V, 5A |
| Power consumption | 0.7A(Tracking),1.8A(GOTO) |
| Polar Scope | Optional iPolar electronic polar scope |
| Meridian treatment | Stop (0-14 pass), auto flip |
| Zero position | Automatic zero search |
| Park position | Horizontal, vertical, current, alt/azi input |
| Level indicator | YES |
| Dovetail saddle | Losmandy D, 17.2″ (437mm) |
| GPS | YES |
| Guiding port | ST-4 |
| Communication port | RS232, USB, LAN, WiFi |
| Cable management | 2xDC12V (1A), 2xDC (5A), ST4, 6P6C, 2xUSB2.0, 3xUSB3.0, USB for PS, AUX |
| Operation temperature | -10C ~ +40C |
| Pier/Tripod | Optional pier |
| Warranty | Two year limited |
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