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iOptron CEM70 EC mount

CHF 4'299.00incl. Swiss VAT

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Timeframe: 10 days to 3 weeks
Estimated shipping: Between November 19 and 24, 2026

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Product description

Product description

Frame SEO description iOptron CEM70 EC

The center-balanced equatorial mount iOptron CEM70 EC is designed for astronomy and astrophotography enthusiasts looking for a high-performance, stable and relatively portable solution. Its innovative Center-Balanced Equatorial Mount architecture reduces vibrations and enables precise tracking of celestial objects, even at long exposures. Thanks to its high load-to-weight ratio and Go2Nova® control, this mount is the ideal choice for observing and imaging nebulae, galaxies and star clusters with maximum sharpness.

Visit CEM70 EC is distinguished by :

  • Load capacity of 31.8 kg (70 lb) to accommodate refractors, mirrors and heavy accessories.
  • A total weight of 13.6 kg for the frame alone, making it easy to transport to dark-sky sites.
  • High-precision stepper motors (0.07″ per step) ensure smooth, silent tracking.
  • Integrated iPolar port for electronic polar alignment, even in the presence of optical obstacles.
  • A Go2Nova 8407+ V2 controller with a database of over 40,000 objects and advanced GOTO functions.
  • A real-time periodic error correction (RPEC) system offering an accuracy of less than 0.3″ RMS.
  • All-metal mechanical design and ergonomic locking levers for use with gloves.
  • A Vixen/Losmandy double saddle for optimum compatibility with optical tubes and accessories.

Technical specifications

Features Detail
Type Center-balanced equatorial mount (CEM)
Payload 31.8 kg (70 lb)
Frame weight 13.6 kg (30 lb)
Load/weight ratio 2,33
Material Aluminum alloy and steel
Latitude adjustment 0° à 65°
Azimuth adjustment ± 4°
Precision per step 0,07″
Periodic Correction (PEC) Real-time EPSC < 0.3″ RMS
Controller Go2Nova 8407+ V2, 40,000+ items
Polar alignment iPolar integrated electronics
Saddle Double Vixen/Losmandy

Designed for demanding astrophotographers, the iOptron CEM70 EC offers an optimum balance between performance, portability and robustness. Its load-to-weight ratio allows heavy configurations to be carried without sacrificing stability, while precise tracking and real-time correction guarantee sharp images without star trails. The Go2Nova® interface facilitates celestial navigation, and electronic polar alignment considerably reduces set-up time.

Comparison CEM70 EC vs. CEM70 EC2

Criteria CEM70 EC CEM70 EC2
Encoders 1 high-resolution encoder (AD axis) 2 high-resolution encoders (AD & DEC axes)
Periodic error correction On a single axis (AD) in real time On both axes (AD & DEC) in real time
Long exposure precision Excellent Optimal (greater resistance to imbalances)
Vibration resistance High Maximum (dual sensors)
Recommended use Advanced astrophotography Very long exposure astrophotography & deep imaging
Price guide More affordable Slightly higher

In short, the CEM70 EC is a powerful choice for most astrophotography configurations, offering precise tracking and good value for money. The CEM70 EC2 gains in robustness and precision thanks to its dual encoder system, making it the mount of choice for extreme long exposure imaging projects or for astrophotographers seeking the best periodic error correction on both axes.

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Frequently asked questions

Frequently asked questions

For what applications should you choose the iOptron CEM70 EC?

Center-balanced equatorial mount for astrophotography with an instrument weighing up to 31.8 kg (excluding counterweights): 11″ Schmidt-Cassegrain, 130–150 mm refractors. Portable (13.6 kg head). Recommended capacity for astrophotography: 23.9 kg, or 75% of the advertised load capacity, to ensure precise tracking.

What sets the iOptron CEM70 EC apart from other mounts?

EMC design (load centered above the tripod): more stable and lighter than a conventional German equatorial mount with the same capacity. Built-in iPolar, GPS, and USB port. EC version: high-resolution encoder on the AD axis to significantly reduce periodic error.

Does the iOptron CEM70 EC come with counterweights?

Yes, like any German equatorial mount. The iOptron CEM70 EC comes with 1 × 9.5 kg counterweight and a bar (Ø 28 × 415 mm).

What power supply should be used with the iOptron CEM70 EC?

The iOptron CEM70 EC is powered by 12 V DC, 5 A; a power adapter is included. Power consumption: 0.6 A during tracking, 0.8 A during GoTo. The power supply is included. The included AC adapter is intended for indoor use; in the field, use a 12 V battery.

Which tripod should I use with the iOptron CEM70 EC?

The iOptron CEM70 EC is sold without a tripod. Choose a tripod or column that can support the total load.

How do you operate the iOptron CEM70 EC?

The iOptron CEM70 EC can be controlled using a hand controller or a computer via USB (ASCOM). For autoguiding (ST4 port), a guide scope such as the 52 Scope guide or the Sky-Watcher EVOGUIDE-50ED is appropriate.

Technical specifications

Technical specifications

Technical specifications

Frame type
German Equatorial
How It Works
Equatorial
Visual Payload
31.8 kg
Astrophotography Capabilities of the Mount
23.9 kg
GoTo
Yes
Encoders
On the AD axis
Connectivity
USB, ASCOM, Keyboard
ST4 Autoguiding Mount
Yes
Periodic error
RPEC (AD encoder)
Dovetail
Double
Counterweight
Required and included
Counterweights supplied
1 × 9.5 kg
Counterweight bar
Ø 28 × 415 mm
Power supply
12 V DC, 5 A, AC adapter included
Power supply included
Yes
Consumption
0.6 A in tracking mode, 0.8 A in GoTo mode
Tripod included
No
Frame weight
13.6 kg
Latitude range
0° à 65°
Azimuth Adjustment
±4°

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