If you’re ready to take your astrophotography to the next level, the iOptron GEM45EC delivers observatory-grade performance in a portable, field-friendly design. With a 45-pound payload capacity, a lightweight but sturdy mount head, and a high-resolution RA axis encoder for sub-arcsecond tracking, this fully loaded package is designed for serious imagers who demand accuracy without compromise.
The GEM45EC package includes the GEM45EC mount head with NUC-ready saddle plate, the rugged LiteRoc tripod, and a fitted hard case to protect your gear in transport or storage. The RA encoder and onboard iPolar alignment tool round out a mount that’s both capable and remarkably user-friendly.
Light, Strong, and Built for Real-World Use
The GEM45EC mount head weighs only 17.4 pounds (7.9 kg), but don’t let its portability fool you. It’s rated to carry telescopes and imaging payloads up to 45 pounds (20.4 kg), making it ideal for everything from long-focus refractors to imaging setups loaded with accessories. Whether you observe from your backyard or travel to remote skies, this mount is ready.
NUC Mounting Plate: Automation Without the Clutter
The GEM45EC includes a built-in NUC mounting plate, pre-installed on the dovetail saddle. It allows direct mounting of Intel NUC mini PCs or similar devices, creating a compact, cable-free control hub right at the mount. No more Velcro pads or trailing wires—just clean, integrated automation. This setup is ideal for users running astrophotography software like NINA, Voyager, or SGP in the field or in observatory installations.
Alignment Made Easy with iPolar
Like all GEM45 models, the EC version comes standard with the iPolar electronic polar scope. This system gives you real-time feedback via a computer interface—even when Polaris is not visible. Setup is fast and precise, letting you align with arcminute accuracy from almost anywhere.
GoTo Performance and Object Database
With the Go2Nova 8407+ hand controller, you get fast, accurate GoTo slewing and access to over 212,000 celestial objects. The intuitive interface supports multiple alignment methods and lets you track planets, deep-sky objects, and comets with ease. The GEM45EC also supports ASCOM and INDI protocols for full PC-based control.
LiteRoc Tripod: Lightweight and Solid
The included LiteRoc tripod provides the ideal balance of portability and strength. Constructed from aluminum with 2-inch stainless steel legs, it offers rigid support with minimal vibration—even under heavy loads. Oversized clamps, a heavy-duty spreader, and precision machining make this tripod a perfect match for the GEM45EC.
Hard Case Included
This package includes a custom foam-lined hard case, designed specifically for the GEM45EC mount head. Whether you’re storing the mount between sessions or taking it on the road, the case provides excellent protection with secure cutouts for the head and accessories.
Now Let’s Talk About the Encoder
The “EC” in GEM45EC stands for Encoder Control—specifically, a high-resolution RA-axis encoder that dramatically improves tracking performance. With the encoder active, the GEM45EC reduces periodic error from ±7 arcseconds (standard) to below ±0.25 arcseconds RMS, enabling unguided imaging at shorter focal lengths and more accurate guided tracking at longer ones.
This makes the GEM45EC ideal for:
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Imaging with refractors, astrographs, or compact Ritchey-Chrétien scopes
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Observatory automation with fewer guide interruptions
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Advanced users who want tighter stars and longer exposures
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Robotic telescope systems where tracking consistency is critical
It’s a professional-grade feature in a portable mount that fits in the back seat of your car.
Specifications
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Payload Capacity: 45 lbs (20.4 kg), not including counterweights
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Mount Head Weight: 17.4 lbs (7.9 kg)
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Tripod Weight (LiteRoc): 13.6 lbs (6.2 kg)
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RA Encoder: High-resolution optical encoder (sub-arcsecond tracking accuracy)
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Drive System: Precision worm gear with stepper motors
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Polar Alignment: iPolar electronic polar scope (integrated)
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Periodic Error: < ±0.25 arcseconds RMS with encoder
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GoTo System: Go2Nova 8407+ hand controller, 212,000+ object database
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Saddle Plate: Dual Vixen and Losmandy D-style compatible
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Ports: USB, 12V DC input, ST-4 autoguider, saddle-mounted USB/power
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NUC Mounting Plate: Included and pre-installed
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Included in Package: GEM45EC mount head, LiteRoc tripod, hard case, hand controller
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Not Included: Counterweights (sold separately)
Observing Tip
The encoder in the GEM45EC gives you more flexibility with guiding. You can use longer guide exposures, reduce corrections, and even experiment with unguided imaging if your setup is short and well-balanced. It also reduces tracking errors during dithering—ideal for imagers using dithering automation in their post-processing pipelines.
