Meet the HEM27 and HEM27EC, iOptron's groundbreaking mounts that combine hybrid strain wave drive tech to redefine your stargazing game. Picture this: a mount head that tips the scales at just 8.15lbs but can shoulder a payload of 29.74lbs—no awkward counterweight or shaft needed. With years of expertise in crafting high-precision mounts, iOptron turns this concept into a real deal with the HEM27 series.

The HEM27 models employ cutting-edge strain wave drive technology for Right Ascension (RA) coupled with a backlash-free worm and belt drive in Declination (DEC), maximizing weight-to-payload efficiency like never before. Not only is its CNC-machined body clad in black anodized metal a sight to behold, but it's also a durable workhorse guaranteed to perform for years on end. Bonus perks? An electronic friction brake and power-down memory mean you can safely halt or pick up where you left off—even after a sudden power cut. No need to recalibrate or start over.

You can take the reins of your HEM27 mount via a PC with ASCOM/Commander on Windows, third-party INDI drivers for MacOS, iOptron Commander Lite or apps like SkySafari on smartphones and tablets, or even a Raspberry Pi device using INDI.

Want to take it up a notch? The HEM27EC comes with a high-precision RA axis encoder for super-accurate tracking, making auto-guiding optional for many users.

Curious about a low-latitude range? HEM27 mounts are available for special orders at 0~22 degrees.

Feature Round-Up

Cutting-edge strain wave drive tech
Payload: 29.7 lbs; Mount weight: 8.15 lbs
CNC-machined, black anodized body
Electronic friction brake for power interruptions
Gear period of 360 seconds
High-precision encoder with Realtime PEC (RPEC)
Go2Nova® hand controller featuring ~212k object database
iPolar electronic polar scope for no-fuss polar alignment
Neat cable management—zero hanging cables
Dual saddle compatible with Vixen and Losmandy-D
Zero position search and locator
Memory for power-down positions
Integrated ST-4 autoguiding port
Onboard Wi-Fi via hand controller
USB port for firmware updates and computer control
Comes with a soft carrying case
Two-year warranty

Discover more about the HEM27 mount today!

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 8.15 ls (3.7kg) with dovetail saddle
Payload/Mount weight	3.65
Payload with CW *	44 lbs (20kg)
Period	360 second
Drive motor	Stepper motor
Structure Material	All metal, CNC machined
Exterior finish	Anodized black
High precision encoder	Yes (RA)
PEC	Yes, Realtime PEC
Latitude adjustment range	15º ~ 65º
Azimuth adjustment range	± 5º
Polar Scope	iPolar electronic polar scope
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 HEM27EC Hybrid Strain Wave Gear Mount with High Precision Encoder

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