iOptron HEM27 Hybrid Harmonic Drive Mount with iPolar and Case – Travel-Ready Power, Counterweight-Free Design
iOptron Part Number: H272A
If you’re searching for a lightweight mount that doesn't skimp on performance, the iOptron HEM27 is a standout choice. Weighing just 8.15 pounds, this hybrid strain wave drive mount can carry up to 29.7 pounds of imaging or visual gear—with no counterweight or shaft required. It’s designed for astronomers who want to travel light, set up fast, and still demand precision and stability under the stars.
With iOptron’s years of mount engineering expertise behind it, the HEM27 is a compact powerhouse that delivers observatory-grade features in a frame small enough to toss in a carry-on.
Hybrid Harmonic + Belt Drive for Dual-Axis Precision
The RA axis of the HEM27 is driven by a strain wave (harmonic) gear system, a technology long prized for its compact size, zero backlash, and high torque output. The result is a sleek, strong drive with smooth tracking that doesn’t require bulky gears or counterweights.
On the DEC axis, iOptron uses a belt-driven worm gear, a proven system that complements the RA harmonic drive with quiet, accurate slewing and reliable, backlash-free motion. This hybrid design gives you exceptional performance in both axes without the weight or complexity of traditional mounts.
The gear period for the RA axis is a generous 360 seconds, making this mount more than capable of handling long exposures with the help of guiding.
Light Weight, High Payload – No Counterweights Needed
The HEM27 supports a full 29.7 lb payload—all while weighing just 8.15 lbs. This makes it an excellent option for:
Thanks to the harmonic drive’s high torque, there’s no need to haul a counterweight system. That means faster setups, lighter travel bags, and one less thing to worry about in the field.
iPolar Alignment Scope – Fast, Accurate Setup
This version of the HEM27 includes iOptron’s iPolar electronic polar alignment scope, built directly into the RA axis. iPolar is factory aligned and provides fast, user-friendly alignment—even when Polaris isn’t visible.
No drift aligning, guessing, or complicated software routines. Just open the iPolar software on your laptop, follow the on-screen directions, and you’ll be polar aligned and ready to track in minutes.
Smart Safety Features and Memory Functions
The HEM27 is designed to protect your gear and your time:
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Electronic Friction Brake: Stops slewing safely in the event of power loss
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Power-Down Memory: Remembers its last position, so you don’t have to realign if power is restored
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Zero Position Locator: Lets you quickly return to a parked configuration at the end of your session
These features make the HEM27 ideal for both manual setups and remote control sessions where reliability matters.
Integrated Cable Management
The HEM27’s design keeps things clean. With internal cable routing, there are no loose wires to wrap around the mount or get caught during slewing. This is particularly important for imagers who need reliability during long unattended sessions.
You also get standard connectivity:
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ST-4 port for autoguiding
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USB port for computer control and firmware updates
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Wi-Fi built into the Go2Nova® hand controller for wireless operation
Go2Nova® Hand Controller – Intuitive, Expandable Control
The included Go2Nova® 8409 hand controller offers:
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A vast 212,000+ object database covering Messier, NGC, IC, SAO, double stars, planets, asteroids, and more
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An OLED display visible even in winter conditions
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A responsive, backlit keypad
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Support for smartphone/tablet control via SkySafari or iOptron Commander Lite
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Compatibility with ASCOM (Windows) and INDI (MacOS, Linux, Raspberry Pi)
Whether you prefer hand-held control or automation via PC, the HEM27 fits seamlessly into your workflow.
What’s Included
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iOptron HEM27 Hybrid Mount Head
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Factory-installed iPolar electronic polar scope
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Go2Nova® 8409 hand controller
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Spring-loaded dual saddle (Vixen and Losmandy D-compatible)
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USB and DC power cables
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Soft padded carrying case
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User documentation
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Two-year manufacturer warranty
Tripod not included. For optimal performance, we recommend pairing with the iOptron 8061A carbon fiber tripod.
Observing Tip
Pair the HEM27 with a wide-field refractor or RASA-style imaging system and enjoy effortless field imaging. With iPolar for alignment, no counterweights to set up, and Wi-Fi-enabled control, you can go from case to imaging in under 15 minutes. Add a small portable battery pack, and you've got a truly mobile astrophotography solution.
Why Choose the HEM27?
The HEM27 is perfect for imagers and observers who want real-world performance in a travel-friendly form factor. It supports nearly 30 pounds of gear with no counterweights, features internal cable routing, iPolar for alignment, and smooth harmonic motion for precise tracking and slewing.
If you're upgrading from a traditional EQ mount or building a new ultra-portable rig, the HEM27 offers a modern solution that just works—cleanly, quietly, and with zero fuss.
