Shop by Price
Shop by Brand

iOptron CEM120-EC Centre Balanced EQ GOTO Mount With RA Encoder

iOptron CEM120-EC Centre Balanced EQ GOTO Mount With RA Encoder
iOptron CEM120-EC Centre Balanced EQ GOTO Mount With RA EncoderiOptron CEM120-EC Centre Balanced EQ GOTO Mount With RA EncoderiOptron CEM120-EC Centre Balanced EQ GOTO Mount With RA Encoder
Price:  £5,598.00(Inc. 20% VAT)Earn 5,598 Loyalty Points

Model:  7301
Brand:  iOptron



Generally In Stock, Please Confirm Before Ordering

2 Year Warranty On All New Items
(Excluding Batteries & Globes)

The All NEW iOptron CEM120EC! 
An extraordinary innovation in mount design...Now with a new payload! 
Recognizing the growing demand for an accurate and stable, equatorial mount with the versatility to carry larger instruments and more complex imaging arrays, we created the iOptron CEM120EC. It offers the benefits of our revolutionary “center balance” design: stability, accuracy, and smooth mechanical operation, while capable of carrying a payload up to 115 lbs (52 kg). The “center balance” design’s natural stability is due to its focusing the mount along with payloads weight directly over the center of the pier or tripod. 
The CEM120EC's performance is demonstrated by its low periodic tracking error of <0.15 arcsec RMS. Along with the stability aspect, the CEM120EC features an advanced cable management system consisting of more ports in more locations preventing tangle ups and reducing the chance of fractured cables. It also adds some new features to the CEM family like Wi-Fi and LAN for remote operation and easy to use, reliable clutches on both axes. 
Optional heavy duty Tri-Pier 360 and Permanent Pier are available for order. 
A new design, center-balanced equatorial mount (CEM) for maximum payload with natural stability
Observatory astrophotography mount ideal for both visual and Astro-photographers
Payload of 115 lbs (52 kg) with the mount weight of 57 lbs (26 kg)
Easy to use and reliable gear clutches
Precision altitude and azimuth adjustment.
Precision stepper motor with 0.07 arcsec accuracy for precise GOTO and accurate tracking
Polar alignment routine for those who can't see the Pole Star
Go2Nova® 8407 V2 controller with Advanced GOTONOVA® GOTO Technology with built in heater
High precision tracking with low periodic error (PE)<0.15 arcsec RMS
Real time periodic error correction (RPEC)
32-channel Global Positioning System (GPS)
Built-in WiFi and LAN for remote operation
Integrated ST-4 autoguiding port
Advanced cable management system with more choices
Spring loaded, individual adjustable Losmandy saddle
CEM120EC mount head x1
Go2Nova 8407 V2 hand controller x1
10 kg counterweight x1 ((free extra one for limited time)
Counterweight shaft x1
Hand controller cable x1
Serial cable (#8412) x1
Mount       Center-balanced Equatorial Mount (CEM)
Payload       52kg (115 lbs), exclude counterweight*
Mount weight       26kg (57 lbs)
Payload/Mount weight ratio       2
Material       All metal
Latitude adjustment range       0°~ 68° (0.5 arcmin division)**
Azimuth adjustment range       ± 5° (3 arcmin division)
PE (by encoder)       < 0.15 arcsec RMS
Worm period       240 sec
PEC       Real time PEC (RPEC)
Right Ascension worm wheel       Φ216mm, 360 teeth, zero backlash
Declination worm wheel       Φ216mm, 360 teeth, zero backlash
Worm       Φ26mm
Right Ascension axle       Φ80mm, steel
Declination axle       Φ80mm, steel
Right Ascension bearings       Φ125mm
Declination bearings       Φ125mm
Counterweight shaft       Φ38.1x 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® 8407 V2, 8 line 21 character LCD
Power requirement       DC 12V, 5A
Power consumption       0.7A(Tracking),1.8A(GOTO)
Polar Scope       Optional 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), DC5V(1A), 2xDC (5A), ST4, 6P6C, 4xUSB2.0, USB3.0 (powered), USB for PS, AUX
Pier/Tripod       Optional pier
Warranty       Two year limited 
* These are only guidelines. Some telescopes are very long or very big for their weight and may require a larger mount. Remember also that imaging requirements are more rigid than visual observation. 

Be the first to Write a Review for this item!

Some items that are showing as in stock are in stock at our holding warehouses, not at the shop. To double check the stock levels at the shop, please contact us on 01909774369 or

The delivery times for most items is 1 - 2 days but again, please double check stock levels on important orders before placing an order via the website.

The delivery costs for courier next day are for mainland UK only. If you live in the Scottish Highlands/Islands, Channel Islands or Northern Ireland, then a shipping surchage will apply. please contact us for prices. Smaller items can still go 1st class via Royal Mail.

Please note that if you are wanting to take advantage of our Saturday and Sunday timed services or next day pre 12 or pre 10:30 services, you MUST check that the stock is here at the shop before placing orders. Also, orders using the Saturday and Sunday services must be placed before 1pm the previous working day. Also, please remember to check that the stock is here at the shop before placing orders. If the stock is not at the shop, we won't be able to ship on any of the timed services. 

Please note International customers will need to contact us for a shipping price prior to ordering via the website. We don't ship all items internationally. It is at our discretion what we ship outside of the UK. This all depends on the size and weight of the items. Please get in touch with us for any postage costs. Please note we do NOT ship telescopes or heavy items outside of the UK. This is due to massive postage costs and problems regarding returns.

If you have any questions regarding stock levels or delivery, please get in touch.

Rother Valley Optics now have a loyalty point scheme active on the website. As you can see from the products, every item has a point value. Each pound you spend with us, you will receive 1 loyalty point. 1 point is worth 1p. You can accumulate these points as you shop with us, then when you are over £5, you can spend them on the website! Easy as that.

Even if you collect most of your items from our shop, you can still order via the website and select the "shop collection" delivery option. Then you can come to our shop, collect your item and still get your points!

Please note this scheme is online only. Customers who order via the telephone can still be added to the scheme manually. Please ask for more details on this. Before placing orders online, please make sure you are registered with us first otherwise your points won't be allocated.

So happy shopping and if you have any questions about the scheme or any other queries, please get in touch.

Rother Valley Optics


Finance is now available on most products above £250! We offer 12, 24, 36 and 48 months with a fixed 15.9% typical APR. Please note this can't be done through the website at this moment in time. You will need to email us or drop into the shop to sort out finance. As long as the item is above £250, finance is generally available!

Please note some items are NOT eligible for finance. Please contact us for eligibility first. 

Please get in touch with us today to find out if you're applicable.

You must be over 18 years to apply, live in the UK, have a valid UK bank account and not be bankrupt. Your credit file will be searched on application to see if you are eligible.

Rother Valley Optics Ltd is registered in England and Wales 04762707. Registered Office: 21 Station Road, Kiveton Park, Rotherham, S26 6QP. Rother Valley Optics Ltd acts as a credit broker only. Rother Valley Optics Ltd are authorised and regulated by the Financial Conducts Authority. Credit provided subject to age and status..

If you have any questions about this, simply give us a ring or drop into the shop for a chat.

- - - Rother Valley Optics Ltd

01909 774 369