iOptron HEM27EC EQ SWG Hybrid Mount Head
Manufacturer Part # H274
The iOptron HEM27EC is one of the most compact and capable harmonic equatorial mounts on the market today, offering a powerful blend of high-precision RA tracking, zero-backlash harmonic drive motion, and a 29.7 lb payload capacity—all in a mount head that weighs under 9 pounds.
This version omits the iPolar alignment camera, making it perfect for astrophotographers who already have a polar alignment solution in place or prefer software-based methods like NINA, SharpCap, or PHD2 drift alignment.
Harmonic Drive Mount Built for Mobility
The HEM27EC is part of iOptron’s Hybrid Harmonic Drive series, combining strain wave gear technology with a center-balanced architecture that eliminates the need for counterweights in most setups. The result is an equatorial mount that’s highly portable, yet accurate and robust enough for deep sky imaging.
It’s a dream mount for travelers, small observatories, or anyone looking to streamline their astrophotography workflow.
High-Resolution RA Axis Encoder for Real-Time Tracking Correction
The “EC” in HEM27EC means it includes a high-resolution encoder on the right ascension axis, delivering real-time periodic error correction without relying solely on guiding. That means less time fiddling with calibration and corrections, and more time capturing usable frames.
This mount routinely achieves sub-arcsecond tracking error, which is especially valuable for imagers running longer focal lengths or pixel scales below 2 arcseconds per pixel.
Lightweight and Strong: 29.7 lb Capacity, 8.15 lb Mount
Despite weighing just over 8 pounds, the HEM27EC can carry up to 29.7 pounds of gear without the use of counterweights—depending on the scope’s moment arm. Add the optional counterweight kit, and the payload capacity increases further, making it flexible enough to handle everything from wide-field refractors to mid-size imaging reflectors.
This version’s compact size also makes it ideal for airline travel, field setups, or automated rigs where every ounce counts.
Designed for Imagers Who Already Know What They Need
If you already use software-based polar alignment routines or an external polar scope, this version of the HEM27EC gives you everything else—encoder-based precision, high torque tracking, and GoTo functionality—without the added cost of the iPolar camera.
The clean design and reduced cabling also make it an attractive option for minimal setups or tight spaces.
USB and Wi-Fi Connectivity via Hand Controller
The HEM27EC comes with the Go2Nova 8409 hand controller, offering an object database of over 212,000 celestial objects. Built-in USB and Wi-Fi connections (via the hand controller) allow for full integration with PC or mobile software platforms.
It’s fully compatible with ASCOM, INDI, SkySafari, iOptron Commander, and other control apps, so you can build your imaging setup your way.
Included Accessories
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HEM27EC harmonic drive equatorial mount head
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High-resolution RA axis encoder
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Go2Nova 8409 hand controller with 212,000-object database
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Hard case for the mount head
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USB and power cables
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DC power supply and cable
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Mount base with 3/8-16 thread
Optional Accessories (Sold Separately)
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iOptron LiteRoc tripod or Tri-Pier
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Counterweight shaft kit and weights
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External polar alignment tools (SharpCap, Polemaster, etc.)
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iMate for remote or standalone operation
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Mini pier extension
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Soft accessory bags
Final Thoughts
The iOptron HEM27EC is a precision-crafted mount for astrophotographers who value portability, performance, and flexibility. With RA axis encoder correction, no need for counterweights, and a clean, no-iPolar layout, it’s a fantastic option for travel imaging, backyard setups, or anyone building a minimalist astrophotography rig with maximum capability.
Observing Tip:
When setting up a counterweight-free harmonic mount, balance is still key—just not in the traditional sense. Aim for dynamic balance: make sure your imaging train’s center of gravity falls close to the saddle’s pivot point to reduce motor strain and maximize tracking precision.
Tech Details:
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