Astronomy Specialist



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The new iOptron HEM27 with iPolar is an incredibly portable hybrid harmonic drive mount, weighing only 3.7kg and boasting a payload capacity of 13.5kg without needing counterweights.

Utilizing modern harmonic drive (strain wave gear) technology for the RA axis and backlash-free belt-driven worm gear on the DEC axis, the HEM27 is capable of unparalleled weight to payload efficiency.

The mount is completely CNC-machined and anodized for strength, lightness and durability. The mount is equipped with an electronic friction break and power down memory, allowing the mount to safely stop and resume slewing or continue tracking even after sudden power loss.


Note: The HEM27 does not include a tripod. You can purchase the iOptron Carbon Fibre Tripod separately.



  • Advanced harmonic drive technology
  • Lightweight at 3.7kg (with saddle)
  • Payload capacity of 13.5kg
  • CNC-machined body
  • Go2Nova hand controller with 212,000 object database
  • Unique friction brake to safely stop mount if power is lost
  • 360 second gear period
  • Through-mount cable management system
  • iPolar electronic polar alignment camera
  • Dual Vixen & Losmandy saddle
  • Built-in zero positioning system
  • Permanent periodic error correction on standard model
  • Integrated ST-4 autoguiding port
  • Built-in Wi-Fi (via hand controller)
  • USB port for firmware upgrade and computer control
  • 2 Year manufacturer's warranty


Hybrid harmonic drive equatorial mount
Gear Strain wave 17 (RA)/worm gear (DEC)
RA Reduction ratio
Mount weight (w/o dovetail saddle) 3.4 kg (7.49 lbs)
Mount weight (w dovetail saddle) 
3.7 kg (8.15 lbs)
Max payload (w/o CW) at 200 mm  13.5 kg/29.74 lbs
Payload/weight ratio 3.65
Period 360 sec
Structure Material All metal, CNC machined
Exterior Finish Anodized black
Drive motor Stepper motor
Latitude Range 15° - 65°
AZ adjust range ±5°
Power DC 12V - 5A
Power consumption 0.5A (tracking), 1A (GoTo)
Control system GotoNova / Commander software
Hand controller Go2Nova® 8409 with ~212,000 objects database
Communication USB, Wi-Fi
Autoguide port ST4
Dovetail saddle Vixen & Losmandy
Cable No floating cables
Cable management 2 x 12V (up to 4A), 1 x USB
Power off brake Electronic friction brake
Power-down memory Yes
PEC Permanent Periodic Error Correction
Zero position search Yes
Max go-to speed 6°/Sec
Internal iPolar Yes
High Precision encoder On EC model
Temperature range   -20°C ~ 50°C (hand controller -10°C ~ 50°C)
Warranty  2 years

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