There are telescope mounts—and then there are instruments. The iOptron CEM40EC, bundled here as package #C404AN3, belongs in the latter category. It is not simply a means to track the sky; it is a precision-crafted platform, designed from the ground up to satisfy the discerning astrophotographer who seeks sub-arcsecond tracking accuracy, intelligent automation, and elegant portability in one cohesive system.
This is a mount that doesn’t merely keep up with your imaging ambitions—it refines them. At its core lies a Renishaw-class high-resolution encoder that whispers corrections to the RA axis with a fluidity that borders on artistry. Typical RMS tracking error of ±0.25 arcseconds places the CEM40EC squarely in the realm of observatory-class performance—yet the entire mount head weighs less than 16 pounds.
This version includes iOptron’s best-in-class accessories: the iPolar electronic polar scope, a NUC-ready saddle with integrated power and USB ports, a LiteRoc stainless steel tripod, and a custom foam-lined hard case. The result is a mount that feels just as at home on a remote imaging trip as it does bolted to a permanent pier beneath a roll-off roof.
A Symphony of Engineering and Balance
The Center-Balanced Equatorial Mount (CEM) design is a departure from traditional German equatorials. By placing the RA and DEC axis load squarely over the center of gravity, the CEM40EC reduces stress on the drive system and enhances overall stability. What does this mean in practice? Lower power draw. Improved balance. Smoother guiding. You’ll notice it not only in the images you capture, but in how quietly and effortlessly the mount moves under your fingertips.
You won’t be surprised to learn the motors are virtually silent. Precision often whispers, and this mount is no exception.
Encoder Precision at Its Finest
The hallmark of the EC version is the high-resolution RA encoder, which effectively eliminates periodic error at the mechanical level—not through software trickery or heavy guiding corrections, but with a direct line of feedback to the mount’s motion. The result is rock-solid tracking that remains steady even at long focal lengths or during unguided sessions. For advanced imagers looking to push the limits of resolution and stability, this encoder is the key.
Imaging-Centric Features with Real-World Intelligence
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Integrated iPolar electronic polar scope: No more craning your neck or guessing through crosshairs. The built-in iPolar camera allows fast, accurate polar alignment—even when Polaris is out of view—using your PC or imaging laptop.
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NUC-ready control deck: The mount saddle includes a custom bracket designed to hold a small form-factor Intel NUC computer. Combined with built-in USB and 12V power ports, this feature streamlines your imaging setup, eliminating dangling cables and external hubs. Your control system becomes one with the mount.
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LiteRoc 1.75" tripod: This tripod is a study in balance—lighter than older heavy-duty legs, but strong enough to suppress vibration and support the CEM40’s full 40-pound capacity. The stainless steel legs and cast spreader create a stable foundation that complements the mount’s fluid motion.
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Custom hard case: Precision instruments deserve protection. The included foam-lined case cradles the CEM40EC during transport and storage, ensuring your investment stays pristine between sessions.
Technical Specifications:
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Mount Type: Center-balanced equatorial (CEM)
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Payload Capacity: 40 lbs (18 kg), excluding counterweights
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Mount Head Weight: 15.8 lbs (7.2 kg)
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Tracking Accuracy (EC Model): ±0.25 arcseconds RMS (typical)
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Counterweight: 10 lbs included
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Included Tripod: LiteRoc 1.75" stainless steel
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Polar Alignment: iPolar electronic polar scope (integrated)
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NUC Plate: Yes – with saddle-mounted USB and 12V power ports
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PEC and Permanent PEC: Yes
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Hand Controller: Go2Nova 8407+ with 212,000+ object database
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Power Requirement: 12V DC, 5A
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Connectivity: USB, ST-4 autoguider, optional Wi-Fi
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Included Case: Foam-lined hard case
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Part Number: C404AN3
Ideal Pairings and Performance
The CEM40EC pairs beautifully with imaging telescopes up to 8" in aperture—triplet refractors, small RCs, compact Newtonians, and astrographs with heavy camera trains all find a steady home here. The guiding corrections become so minimal that some users report sub-pixel accuracy with PHD2 making only gentle suggestions, not constant corrections.
This is the kind of mount you can grow into. One that doesn’t impose limitations but instead removes them.
Observing Tip:
For imagers running multi-hour sessions with filter wheels and temperature shifts, combine the CEM40EC with iOptron’s iEAF electronic focuser and your preferred NUC or mini PC. With automated focus, guiding, and pointing accuracy built-in, this mount can execute fully unattended runs—leaving you free to watch the stars or sleep beneath them.
Features
- Unique design, Center-Balanced equatorial mount (CEM) for maximum payload and minimum mount weight
- Idea for both visual observation and astrophotography
- Maximum payload of 40 lbs (18 kg)
- All metal, CNC machined with red/black anodized
- Easy to use quick-lock gear clutches
- Integrated iPolarTM electronic polar finder
- Low periodic error (< 0.3 arc seconds rms)
- Realtime periodic error correction (RPEC)
- Precision stepper motor for precise GOTO and accurate tracking
- Go2Nova® hand controller with Advanced GOTONOVA® GOTO Technology with built-in heater
- Integrated ST-4 autoguiding port
- 32-channel Global Positioning System (GPS)
- USB communication port
- Advanced cable management system for mount and NUC
- 6" Losmandy D & Vixen dual dovetail saddle with NUC mounting adapter
- Standard LiteRoc 1.75" inch heavy-duty stainless steel tripod (7kg)
- Hard case
- Optional WiFi for mount control via SmartPhone/Tablet/Computer
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NEW iOptron subsidized TheSky Imaging Edition
