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Description
iOptron CEM120EC EQ GoTo Mount with High Precision RA EncoderDescription An extraordinary innovation in mount design Recognizing the growing demand for an accurate and stable, equatorial mount with the versatility to carry larger instruments and more complex imaging arrays, iOptron created the CEM120. It offers the benefits of their revolutionary center balance design: stability, accuracy, and smooth mechanical operation, while capable of carrying a payload up to 52kg. The centre balance designs natural
Description
An extraordinary innovation in mount design
Recognizing the growing demand for an accurate and stable, equatorial mount with the versatility to carry larger instruments and more complex imaging arrays, iOptron created the CEM120. It offers the benefits of their revolutionary center balance design: stability, accuracy, and smooth mechanical operation, while capable of carrying a payload up to 52kg.
The centre balance design’s natural stability is due to its focusing the mount along with payloads weight directly over the centre of the pier or tripod.
The CEM120's performance is demonstrated by its low periodic tracking error. Along with the stability aspect, the CEM120 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.
Features
- Centre-balanced equatorial mount (CEM) for maximum payload with natural stability
- Payload of 52 kg with the mount weight of only 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
- Permanent periodic error correction (PPEC) or real time PEC for the CEM120EC and CEM120EC2
- 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
The CEM 120 is available in three versions, the CEM120, CEM120EC and CEM120EC2. The EC versions has high resolution encoders for real time nearly error free tracking, the EC2 has the encoders on both axes.
Specifications:
Capacity |
|
| Designation | CEM120EC |
| Max. additional load capacity (kg) | 52 |
| Counterweight(s) (piece) | 2x10kg |
| Interfaces | RS232, USB, LAN, WIFI |
| Power supply | 12 |
| Language | English |
| Polar elevation setting (°) | 0 - 68 |
| Mounting saddle | Losmandy-Style |
| DEC ball bearings diameter (mm) | 125 |
| DEC worm gear diameter (mm) | 216 |
| RA worm gear diameter (mm) | 216 |
| Worm gear teeth (DEC) (piece) | 360 |
| Worm gear teeth (RA) (piece) | 360 |
| Material of worm wheel | Aluminium |
| Weight mount head only (kg) | 26 |
| Slow-motion azimuth adjustment | +/- 5 |
| Precision of tracking | < +/- 0,15 |
| DEC worm shaft diameter (mm) | 26 |
| RA worm shaft diameter (mm) | 26 |
| DEC axis diameter (mm) | 80 |
| RA axis diameter (mm) | 80 |
| RA ball bearings diameter (mm) | 125 |
| Diameter of counterweight bar (mm) | 38,1 |
| Motor type | Stepper (128 micro-steps) |
| Software | Go2Nova8407 V2 |
| Amperage (A) | 5 |
| Input voltage | 12 |
| Power consumption in open circuit (mA) | 700 |
| Power consumption (mA) | 1800 |
| Encoder | yes |
Special features |
|
| GoTo system | yes |
| GPS | yes |
| Controllable via PC | yes (ASCOM) |
| Handcontroller | yes |
| Level | yes |
| Autoguider interface | yes (ST-4 interface) |
| PEC correction | yes (permanent) |
Equipment |
|
| Tripod <p> | without tripod |
| Pole finder | no |
General |
|
| Total weight (kg) | 46 |
| Series | CEM |
| Type | Mount |
| Type of build | Equatorial |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.9 ★★★★★
Based on 11 reviews
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Product Reviews
★★★★★ 5
My Dogs Favorite for throwing
Color: D) 2-Pack Lattice (3.25" Balls), Color: D) 2-Pack Lattice (3.25" Balls)
We brought our new adoptee home end of July, and I quickly had to find him replacements for his tennis balls because those balls are inherently abrasive and our yard has sand which gets in the fuzz and makes them extra abrasive and they were already causing tooth wear (our previous shepherd chewed tennis balls like gum for a week after his adoption, wore his teeth tips enough I noticed and I took them from him too but this guy didn't like the hand me down replacement, it was too big for his preference so I had to hunt down different ones for the current dog).
I tried the glow in the dark Chuk It ones, but he doesn't like to carry them, or the smaller regular chukits... My current dog prefers these web style ones. I like glow in the dark stuff and it makes them easier to find in the evening or over night (if you have night adjusted eyes and not a lot of lights in the yard these are VERY glowy at night). Now I know he likes them I am thinking winter is coming and I may lose the glow color in the Michigan snow, so I'm here to order some in some in non snow camouflage because I want to be able to play in the winter without as much groping for hiding balls (literally he will chase and then snub any other balls in the yard I throw except the huge jolly ball but that isn't a fetch type ball, its a thrash toy. these are the only ones he will actually return for me to swap and throw indefinitely).
I included video and a picture of them at the local beach. They float with enough above the water for maybe a few ants to use them as a flotation device, but take a bit of time to come to the surface when they splash down. I think brighter colors will help make them easier to find in the water as well as the snow.
I think my dog likes them because the webbing design makes it easier to grip, even when slobbery his teeth can get a hold in the gaps (so can fingers haha) without slipping too badly. They also compress almost flat and boing back into shape and seem to be durable over at least 6 weeks of summer living in the yard, so far so good. They don't have a huge amount of mass so they don't whip super far but if you get a technique down you can get very reasonable distance on throws. He doesn't gnaw on them, so I can't speak to resistance to actual shearing attempts with teeth, just grab and chomp for fun, then holding in his mouth.
My dog weighs about 68 lbs (we are trying to gain a bit), he is a German Shepherd, and this size fits him well (can't remember which size I got but usually Amazon shows what size the reviewer got near the title of the review. They're big enough I'm not worried he will accidentally swallow or choke on them, small enough his mouth fits them comfortably, his grip is secure because of the gaps, and he loves them. I suggest get two at least unless your pooch is super good about dropping it and letting you pick it up. With two, I can whip a ball, find the one he just dropped, and by the time he is back, I have the other one in hand. He knows I won't throw it unless he drops the one he just returned (I will wait for him to remember this), and this makes it way easier to play thow and bring it almost back (he often drops it at speed when he is nearly back to me so it rolls past me) without playing chase me for the toy... and makes reinforcing Drop It as an safe thing to do, like he isn't going to lose out if he drops the fun ball in his mouth, I have the second ball to mark (say YES!!! when he drops it) and immediately reward by throwing the ball I already had... he loves them enough that he thinks other balls are stupid so I don't want to throw a less cool ball to exchange for the cool ones haha
Anyway hope this was helpful, Im off to order some of these balls in brighter colors for lake and snow visibility.
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Reviewed in the United States on September 20, 2024
★★★★★ 4
Fun Glow Balls for Night Play, Great Value
Color: A) 2-Pack (2.5" Balls)
The Chew King 2 Piece Glowing Fetch Balls are a solid, budget-friendly alternative to Chuck-It glow balls. While my pups prefer the mouth feel of the Chuck-It balls, these still provide bright, visible fun for dusk or nighttime play, and can even be used indoors with a flashlight to get the game going.
Durable, glowing, and engaging—a good option for evening fetch sessions which always insures that our pups get a great night of rest.
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Reviewed in the United States on January 6, 2026
★★★★★ 5
Durable, Perfect Size, and Glows
Color: A) 2-Pack (2.5" Balls)
I bought these for my 23 pound Bojack (Boston Terrier/Jack Russel) mix and he absolutely loves them. He’s an aggressive chewer that has destroyed Kong toys. This ball has just enough flex or give in it that he can’t tear it apart as it compresses in on itself. After about 6 months it started to wear down and tear a bit by the hole so I just tossed it and gave him the other one. I’ll be buying more of these as they wear out over time.
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Reviewed in the United States on May 14, 2026
★★★★★ 5
A Must for Nighttime Fetch!!
Color: A) 2-Pack (2.5" Balls)
These are an absolute Must!! We have an ESS who is nearly 2yo and destroys Every toy he has. For some reason, he doesn't try to annihilate these glow balls. If he chomps on them, it's just for a moment while he is bringing it back to you. Has just a little weight to them so it goes far enough when thrown and a nice bounce when we have to play in the house, due to weather. Wish the bright 'glow' held a little longer but stays dim for quite some time and overall, just Awesome! Also purchased the 'chuck it' brand and sent them back because these were so much better. Will be buying more, if ever needed, but haven't had to because they are So Durable.
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Reviewed in the United States on April 12, 2026
★★★★★ 5
Awesome quality glow balls
Color: I) 8-Pack (2.5" Balls)
I have bought every glow ball on amazon many times over for my german shepherds. My longest lasting balls have been the chuck-it, they seem to glow longer and not get destroyed but are expensive. These glow balls are our new favorite and not only because of the low price. They hold a good glow longer are heavy duty and fit the chuck-it thrower perfectly. I am stocking up on these. Shipping was also next day so it's 100% buy on these.
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Reviewed in the United States on February 8, 2026