Tradition Meets Innovation in a Precision-Built German Equatorial Mount
The iOptron GEM45 is a modern reimagining of the classic German equatorial mount—crafted not just for strength, but for intelligence, balance, and elegance in motion. With its advanced motor control, CNC-machined body, and sleek matte-black finish, the GEM45 whispers refinement with every slewing motion. This head-only configuration, part number 7620AHC, includes the mount head, counterweight shaft, and a custom foam-lined hard case, but no tripod is included—making it ideal for permanent piers, modular setups, or field astronomers upgrading an existing system.
With a payload capacity of 45 pounds, a native periodic error of just ±7 arcseconds typical, and full support for ASCOM, INDI, and iOptron’s Go2Nova control system, the GEM45 is a powerful imaging and visual platform that punches well above its weight.
The Strength of Heritage, Refined by Technology
In a world of hybrid and center-balanced designs, some astronomers still appreciate the clarity and reliability of a traditional GEM—one counterweight, one payload, and perfect balance across a central axis. The GEM45 takes this familiar format and infuses it with modern efficiency: low-power stepper motors, a precision worm gear and belt system, and an optimized power profile that makes it perfect for off-grid use.
Whether it’s supporting a long refractor, a wide-field astrograph, or a fully loaded imaging train with filter wheel and OAG, the GEM45 has the muscle and finesse to handle the task without complaint.
A Compact Powerhouse
Despite its capacity, the mount head weighs just 17.5 pounds, making it one of the lightest in its payload class. That means more room for optics, less strain on setup, and easier transport to dark-sky sites. The included counterweight shaft is stainless steel, and the dual saddle accommodates both Vixen and Losmandy-style dovetails, making the mount immediately compatible with nearly any OTA you choose.
Engineered for Control
The GEM45 includes iOptron’s Go2Nova 8407+ hand controller, offering access to a database of over 212,000 celestial objects and multiple star alignment routines. For remote or automated setups, control via USB, ST-4 autoguider, or ASCOM/INDI drivers gives you total freedom. It’s fully compatible with NINA, Sequence Generator Pro, Ekos, and other modern astrophotography suites.
The mount also includes PPEC (Permanent Periodic Error Correction) and backlash compensation, letting you refine its performance to your specific optical system and guiding preferences.
Packaged for the Traveler—or the Observatory Builder
Included in this package is a custom foam-lined hard case, precision-cut to hold the GEM45 mount head, hand controller, shaft, and accessories safely during transport. This makes the #7620AHC version ideal for astronomers on the go, as well as for those building a permanent installation who don’t require the tripod. It’s everything you need to get started—except the legs beneath it.
What's Included:
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GEM45 mount head (non-EC version)
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Vixen/Losmandy dual dovetail saddle
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Stainless steel counterweight shaft
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Go2Nova 8407+ hand controller
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USB and ST-4 ports
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Custom foam-lined hard carrying case
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Tripod and counterweight not included
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Part Number: 7620AHC
Technical Specifications:
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Mount Type: German equatorial
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Payload Capacity: 45 lbs (not including counterweights)
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Mount Head Weight: 17.5 lbs (7.9 kg)
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RA/DEC Worm Period: 216 seconds
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Periodic Error (typical): ±7 arcseconds (native, correctable via PEC)
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RA and DEC Bearings: 130mm diameter
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Saddle: Dual-style – accepts Vixen and Losmandy plates
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Hand Controller: Go2Nova 8407+ with over 212,000 objects
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Computer Control: USB, ASCOM, INDI-compatible
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Autoguiding: ST-4 port (supports PHD2, etc.)
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Power Requirement: 12V DC, 5A
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Included Case: Hard carrying case with foam insert
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Tripod: Not included
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Part Number: 7620AHC
Observing Tip:
The GEM45 is ideal for imaging refractors in the 4" to 6" range, 6–8" RCs, and even larger SCTs when balanced correctly. For those building a pier-mounted observatory or seeking a travel rig to pair with a pre-owned iOptron tripod, this mount head configuration provides a cost-effective and flexible foundation—offering high precision and mechanical confidence without duplicate gear.
