The iOptron GEM45 is a high-performance German equatorial mount that blends pro-level tracking precision with a surprisingly compact footprint. With a stout 45-pound payload capacity and a mount head that weighs only 17.4 pounds (7.9 kg), the GEM45 is ideal for serious astrophotographers and visual observers who want robust performance without the bulk of traditional heavy mounts.
This version, iOptron part number 7620AHC, includes the GEM45 mount head only—no tripod, no counterweights, and no case—making it a streamlined and cost-effective choice for those with an existing setup or observatory pier. A fitted hard case is available separately for those seeking enhanced transport protection.
Compact Power, Big Performance
Despite its modest weight, the GEM45 supports payloads up to 45 pounds—enough for large refractors, imaging rigs with filter wheels and guide scopes, or dual-setup side-by-side plates. Its rigid CNC-machined body and internally optimized structure ensure rock-solid stability whether you’re on the road or permanently mounted.
Built-In iPolar for Rapid, Precise Polar Alignment
Included with the GEM45 is iOptron’s iPolar electronic polar scope, which replaces outdated visual scopes with a real-time, software-assisted alignment tool. iPolar works even if Polaris isn’t visible and delivers sub-arcminute alignment accuracy from a computer interface. This significantly reduces your setup time and improves long-exposure tracking performance.
Accurate GoTo and Smooth Tracking
The GEM45 uses precision worm gears and low-backlash stepper motors to achieve native periodic error of ±7 arcseconds or better, without requiring encoders or software corrections. Its proven Go2Nova 8407+ hand controller gives you fast access to a massive 212,000+ object database with intuitive star alignment routines.
Slewing speeds reach up to 4.5° per second, while guided tracking ensures pinpoint star performance for long-exposure imaging—even at longer focal lengths.
Thoughtful Cable Management and Saddle Versatility
At the heart of the GEM45 is a dual Vixen/Losmandy-style saddle that accepts a wide range of dovetail plates. Integrated USB and power ports at the saddle make cable routing cleaner and safer—your imaging equipment can be powered and connected directly at the mount head, eliminating cable snags and strain during long sessions.
Built for the Field or the Observatory
This GEM45 mount head is a great option for mobile imagers looking for maximum power-to-weight efficiency, or for observatory users building around a pier setup. At just 17.4 pounds, it’s light enough to transport without compromising capability. Whether you're upgrading from a smaller EQ mount or downsizing from a heavier rig, the GEM45 offers a near-perfect blend of portability and precision.
A hard case for the GEM45 is optional and recommended for those traveling with their mount.
Specifications
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Payload Capacity: 45 lbs (20.4 kg), excluding counterweights
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Mount Head Weight: 17.4 lbs (7.9 kg)
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Drive System: Precision worm gear with stepper motors
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Periodic Error: ≤ ±7 arcseconds
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Latitude Adjustment Range: 15° to 65°
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Dovetail Saddle: Dual Vixen/Losmandy compatible
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Polar Scope: Integrated iPolar electronic polar scope
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GoTo System: Go2Nova 8407+ with 212,000+ object database
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Ports: USB, 12V DC input, ST-4 autoguider, saddle-mounted USB/power
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Included: Mount head only
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Not Included: Tripod, counterweights, hard case (available separately)
Observing Tip
If your observing site changes with the seasons, the GEM45’s relatively light weight and built-in iPolar make it an ideal traveling companion. Add the optional hard case and a LiteRoc tripod or Tri-Pier to build a flexible, portable imaging platform that doesn’t compromise on stability or tracking precision.
Shipping Contents
- iOptron® GEM45 mount
- Go2Nova® Hand Controller
- Stainless steel counterweight shaft
- Internal iPolar electronic polar scope
- GEM45 GPS module
- AC adapter (100V-240V)
- 2X coiled control Cable (6P6C RJ11 to RJ11, straight wired)
- USB cable
- Quick Start Guide
- Counterweight and tripod NOT included
