Meet the HEM27 and HEM27EC—iOptron's groundbreaking mounts that employ a hybrid strain wave drive. These compact powerhouses redefine what you can expect from an astronomy setup. Picture a mount head that only weighs 8.15 lbs but can support an impressive 29.74 lbs of payload, all without the hassle of extra counterweights or shafts. Building on iOptron's long history of precision engineering, the HEM27 makes this vision come alive.

These mounts leverage cutting-edge strain wave drive tech for the RA movement, combined with a backlash-free DEC worm/belt drive system. The result? Unmatched payload-to-weight efficiency. The sleek black anodized, all-metal, CNC-machined body isn't just eye candy—it's a robust foundation designed to deliver top-notch performance for years. Cool extras like an electronic friction brake and power-down memory mean you can pause a GoTo slew or keep tracking, even if you lose power suddenly (no need to start over from scratch).

Controlling a HEM27 mount is a breeze. You can use a Windows PC via ASCOM/Commander, MacOS software with a third-party INDI driver, a smartphone/tablet via iOptron Commander Lite or an app like SkySafari, or even a Raspberry Pi device with an INDI driver.

Opt for the HEM27EC, and you'll benefit from an ultra-precise RA axis encoder that provides such reliable tracking, many opt to image without additional guidance.

Want to know more about the HEM27 mount?

Special-order versions for low latitudes (0~22 degrees) are also available.

Features:

Cutting-edge strain wave drive tech
Handles a payload of 29.7 lbs while weighing only 8.15 lbs
Crafted from CNC-machined metal
Electronic friction brake for safe stops during power issues
360-second gear period
Built-in permanent periodic error correction (PPEC)
Go2Nova® hand controller with a database of approximately 212,000 celestial objects
Clean cable management—no hanging wires on moving parts
Dual saddle accommodates both Vixen and Losmandy-D styles
Zero-position search and locator built in
Remembers last position and location after power down
ST-4 autoguiding port integrated
Wi-Fi connectivity (via hand controller)
USB port for updates and computer control
Comes with a soft carry case
Two-year warranty

Specifications

Mount	Hybrid Equatorial Mount
RA gear system	StrainWave 17
DEC gear system	Backlash-free worm/belt system
RA reduction ratio	480:1
Payload w/o CW *	29.74 lbs (13.5kg)
Mount weight	7.49lbs (3.4kg) w/o dovetail saddle 8.15lbs (3.7kg) with dovetail saddle
Payload/Mount weight	3.65
Maximum payload with CW *	44 lbs (20kg)
Period	360 second
Drive motor	Stepper motor
Structure Material	All metal, CNC machined
Exterior finish	Anodized black
PEC	Yes, Permanent PEC
Latitude adjustment range	15º ~ 65º
Azimuth adjustment range	± 5º
Polar Scope	No
Level indicator	Level bubble
Control system	GOTONOVA/Commander
Hand Controller	Go2Nova® 8409 with ~212,000 objects database
Tracking	Automatic
Maximum slew speed	6º/sec
Power consumption	0.5A(Tracking), 1A(GOTO)
Power requiremention	DC12V-5A (5.5/2.5mm DC plug)
AC adapter	100V ~ 240V (included, indoor use only)
Cable	No moving/wrapping
Cable management	2X12V (4A max.), 1X USB2.0
Power off brake	Electronic friction brake
Power-down memory	Yes
Wi-Fi	Built-in
Communication port	Yes (Wi-Fi and USB)
Autoguide port	Yes (ST-4 compatible)
Firmware upgrade	Yes
Dovetail saddle	Vixen & Losmandy
Tripod	Optional
Counterweight Shaft	SS Φ20X200mm, M16 thread (Optional)
Counterweight	10 lbs (4.5kg)(Optional)
Operation temperature	-20ºC ~ 40ºC (hand controller -10ºC ~ 40ºC)
Warranty	Two year limited

* 200mm, with payload center of gravity to the RA rotation axis. Or an OTA size of ~220mm.

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iOptron HEM27 Hybrid Strain Wave Gear Mount without iPolar

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