iOptron HEM27 Hybrid Harmonic Drive Equatorial GoTo Mount
 iOptron HEM27 Hybrid Harmonic Drive Equatorial GoTo MountiOptron HEM27 Hybrid Harmonic Drive Equatorial GoTo Mount 

iOptron HEM27 Hybrid Harmonic Drive Equatorial GoTo Mount

£1,759.00✓ 2 year warranty


Out of stock due 60-90 working days

About this product

Model:  iop_hem27
Part Number:  H272

New Hybrid Harmonic Drive Mount from iOptron

This portable, high-payload tiny titan will deliver an astronomy experience like never before. A mount head weighing in at 3.7kg / 8.15 lbs with a payload capability of 13.5kg / 29.74 lbs, without needing a cumbersome counterweight or shaft. 

Utilising state-of-the-art harmonic drive technology for the RA movement in tandem with backlash-free DEC worm/belt drive design, the HEM27s deliver unparalleled weight to payload efficiency. Its black anodised all-metal CNC machined body is a sturdy, rugged platform that will perform at the highest level for many years.

Unique features such as an electronic friction break and power-down memory enable the mount safely stop and resume a GoTo slew or continue tracking even after an abrupt power loss (no need to realign and restart).

The HEM27EC features a high-precision RA axis encoder that delivers incredible tracking accuracy, enough that many will choose to image “sans” guiding. 

IOptron's HEM27 FAQ page. 


  • Advanced harmonic drive technology
  • Payload capacity of 13.5 kg (29.7 lbs) with a mount weight of 3.7 kg (8.15 lbs)
  • CNC machined and cast metal body
  • Unique friction brake to safely stop movement during a planned or unplanned power interruption
  • 360-second gear period
  • Permanent periodic error correction (PPEC)
  • Go2Nova® hand controller with ~212,000 object database
  • Cable management system, no hanging exterior cables to moving parts
  • Dual saddle (Vixen and Losmandy-D styles)
  • Built-in zero position search and locator
  • Power down position and location memory
  • Integrated ST-4 autoguiding port
  • Built-in Wi-Fi (via hand controller)
  • USB port for firmware upgrade and computer control
  • Soft carrying case
  • Two-year warranty

Go2Nova Hand Controller 8409

  • 212,000 object database & star identification
  • Large LCD screen with four lines and 21-character with backlit LED buttons
  • User-friendly interface
  • 9-speed setting for motor slew speed
  • Serial port for firmware upgrade and mount computer control

What's in the box

  • Telescope mount
  • Hand controller (HC) – Go2Nova® 8409 
  • Controller cable
  • AC adapter – 100‐240V 
  • Soft carry case


Mount Hybrid Equatorial Mount
RA Gear system StrainWave 17 (RA)/worm gear (DEC)
DEC Gear system Backlash-free worm/belt system
RA reduction ratio 120
Payload w/o CW * 29.14 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
Period 360 second
Drive motor Stepper motor
Structure Material All metal, CNC machined
Exterior finish Anodised 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 Requirement 12V DC, 5A
AC adapter 100V ~ 240V (included, indoor use only)
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
Tripod Optional
Operation temperature -20ºC ~ 50ºC (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.

Downloads / Manuals


Quick Start Guide
Instruction Manual

Firmware and Software:
Download Latest Firmware

iOptron Telescope ASCOM Driver:
Install ASCOM Driver and Commander

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