iOptron CEM120EC Mount GoTo High Precision Encoder

iOptron CEM120EC GoTo High Precision Encoder Mount: observatory precision with RA encoder

The iOptron CEM120 is a center-balanced equatorial GoTo mount for the heaviest amateur setups: 52 kg (115 lbs) payload capacity, excluding counterweights, with a head weight of 26 kg (57 lbs). Designed for observatories and permanent setups with large optics and complete imaging systems.

The EC version measures the right ascension axis with a high-resolution encoder and corrects the periodic error in real time. For many photo setups, this eliminates the need for autoguiding on the RA axis.

All observatory functions of the CEM120 remain on board: GPS, WiFi, LAN, and the extensive cable management.

Real-time error correction on the RA axis

The encoder makes continuous corrections without PEC training. Stars remain sharp in long exposures, even unattended.

For the declination axis and long focal lengths, ST-4 autoguiding remains available.

Heavy mechanics, fine tracking behavior

Machining 80 mm thick shafts on 125 mm bearings; the 216 mm worm wheels with 360 teeth and a worm period of 240 seconds provide tracking performance with a periodic error of under plus or minus 3.5 arcseconds.

The spring-loaded Losmandy saddle and the adjustable counterweight shaft (usable down to the equator) make the mount suitable for virtually any large OTA. The head is supplied without a tripod; the Tri-Pier with adapter or a permanent pier is the suitable base.

Observatory class control

The Go2Nova 8407 V2 hand controller with display heating contains over 200,000 objects. GPS, WiFi, and a LAN connection are built-in, so the mount fits directly into any observatory network.

Autoguiding is possible via the ST-4 port; the extensive multi-port cable management also keeps dual photography setups tidy.

Included

• CEM120EC mount with RA encoder
• Go2Nova 8407 V2 hand controller with display heating
• Two 10 kg counterweights with counterweight bar
• Network adapters and cables

Featured accessories

Combine the head with the 230 mm Tri-Pier adapter and the iPolar for the CEM120 for electronic polar alignment.

For whom yes and for whom no

• ✓ Observatory builders and owners of large catadioptric telescopes or dual-camera setups
• ✓ If you want to control a fixed setup up to 52 kg via a network
• ✓ Who wants to work on the RA axis without guiding
• ✗ Mobile observers: a CEM70 or smaller is then more practical

Specifications

You can find more mounts and accessories for this merk at the iOptron merk page.