Astronomy Specialist




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Includes a FULLY CERTIFIED Australian power supply!


The iOptron GEM45 is an innovative next-generation German equatorial mountUtilizing experience gained during development of the CEM series, iOptron was able to remove unnecessary bulk giving the GEM45 an incredible 2.5 payload to mount weight ratio.

This compact 7.9kg mount can precisely GOTO an object and track with up to 20kg of gear onboard. With its integrated iPolar electronic polar scope, polar alignment is a snap, even when the pole star is obscured. Large levers on the quick-lock drive engagement system make it easy to snap its drive gears into place even when wearing gloves. The gears are spring-loaded for reduced backlash.

There is little chance of your cables getting snagged with the GEM45's internal advanced cable management system. A 6" dual dovetail saddle accommodates Losmandy and Vixen style dovetail plates.

The GEM45 mounts utilize reliable stepper motor drive systems with iOptron's low power consumption technology. The new LiteRoc 1.75" tripod delivers rock solid stability in a lighter, more compact package. A 212,000+ object library with star identification, GPS, Wi-Fi (requires optional iStarFi adapter) are a few of the desirable features standard on the GEM45 mount.




  • German equatorial mount with innovative features
  • Ideal for both visual observation and astrophotography
  • Maximum payload of 20 kg (45 lbs) with the mount weight of only 7.9 kg (17.5 lbs)
  • Easy to use quick-lock gear clutches
  • Integrated iPolar electronic polar finder
  • Low periodic error (< ± 7 arc seconds)
  • Permanent periodic error correction (PPEC)
  • Precision stepper motor for precise GOTO and accurate tracking
  • Go2Nova 8407+ controller with Advanced GOTONOVA® GOTO Technology and built-in heater
  • Integrated ST-4 autoguiding port
  • 32-channel Global Positioning System (GPS)
  • USB communication port
  • Cable management system
  • 6" Losmandy-D & Vixen dual dovetail saddle
  • All metal, CNC machined with red/black anodized
  • Optional WiFi for mount control via SmartPhone/Tablet/Computer
  • All new LiteRoc 1.75" tripod with improved stability and leg locks
  • NEW iOptron subsidized TheSky Imaging Edition



German Equatorial Mount
Max payload 20 kg (45 lbs) excluding counterweight
Mount weight
7.9 kg (17.5 lbs)
Payload/Mount weight ratio 2.53
Body material
All metal, CNC machined, anodized
Periodic error (PE) <±7 arcsec
PEC Yes, Permanent PEC
Worm period 400 sec
Right Ascension worm wheel Φ 110 mm, 216 teeth, zero backlash
Declination worm wheel Φ 110 mm, 216 teeth, zero backlash
Right Ascension axis shaft Φ 45 mm steel
Declination axis shaft Φ 45 mm steel
Right Ascension bearing Φ 68 mm
Declination bearing Φ 68 mm
Worm diameter Φ 17 mm, Brass
Motor drive Precision 1.8º stepper motor, 128 x microdivision
Resolution 0.08 arc seconds (200 PPS)
Transmission Synchronous belt
Latitude adjustment range 14º ~ 68º
Azimuth adjustment range ± 6º
Polar Scope Internal iPolar electronic polar scope
Level indicator Level bubble
Hand Controller Go2Nova 8407+, 8 line 21 character LCD
Meridian treatment Stop (0-20° pass), flip
Max slew speed 4.5°/sec (1080x)
Power consumption 0.6A (tracking), 0.9A (GOTO)
Power requirement 12V DC, 5A, 5.5mm x 2.5mm plug
Power-down memory Yes
Wi-Fi External (optional)
Communication port USB
Autoguide port ST-4
Cable management DC 12V (3A), ST4, USB
Counterweight shaft Φ 28 x 280 mm, Stainless Steel, 1.2 kg
Counterweight 5 kg (11 lbs)
Tripod LiteRoc heavy-duty stainless steel tripod (8kg)
Dovetail saddle 6" Losmandy D & Vixen
Operation temperature -10ºC ~ 40ºC
Warranty Two year limited
SKU IO-7603A


  • iOptron GEM45 mount
  • Go2Nova 8407 Hand Controller
  • One 11lbs (5 kg) counterweight
  • Stainless steel counterweight shaft
  • Internal iPolar electronic polar scope
  • GEM45 GPS module
  • AC adapter (240V)
  • 2X coiled control Cable (6P6C RJ11 to RJ11, straight wired)
  • USB cable
  • LiteRoc 1.75" tripod with improved stability and leg locks
  • Quick Start Guide
Welcome Newcomer