Astronomy Specialist




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Includes a FULLY CERTIFIED Australian power supply!


The new iOptron GEM28 is a compact next-generation German equatorial mount designed with portability in mind. Weighing in at only 4.5kg, it can support up to a 12.7kg payload - an incredible 2.8 mount weight to payload ratio.

iOptron achieved this using design methods developed to reduce mass in their CEM family of mounts. The German EQ versions were created to satisfy consumer that prefer a more traditional mount and to function at higher latitudes.

Building on the legacy of earlier GEM models, iOptron have added features for convenience and functionality. A positive lock gear engagement system (easy to use even when wearing gloves), built-in Wi-Fi enabling unparalleled connectivity and recordable permanent periodic error correction (PPEC) to repeat optimal PEC training sessions. The gears are spring-loaded for reduced backlash.

With precise pointing and accurate tracking, the GEM28 sets the new standard for compact German equatorial GOTO mounts.

The GEM28 is equipped with the latest advanced GOTONOVA® GOTO technology, making it one of the most powerful and accurate GOTO mounts available. The 212,000 object library ensures you’ll never run out of targets to see or image. The Go2Nova Hand Controller is intuitive to use and its large 4-line LCD screen simplifies the process of setting telescopes and locating objects.

This GEM28 package includes the iPolar electronic polar scope installed for quick and easy polar alignment, and comes with the LiteRoc heavy duty stainless steel tripod.



  • German equatorial design, latitude range of 10° ~ 70°
  • Ideal for both visual observation and astrophotography
  • Low periodic error (< ± 10 arc seconds)
  • Payload of 12.7 kg (28 lbs) with the mount-only weight of 4.5 kg (10 lbs)
  • CNC machined and cast metal body
  • Spring loaded gear system
  • Large easy to use quick-lock gear clutches
  • Stepper motor with low power consumption
  • iPolar electronic polar scope
  • Polar alignment routine for those who can’t see the Pole Star
  • Go2Nova 8409 controller with Advanced GOTONOVA® GOTO Technology
  • Integrated ST-4 autoguiding port
  • Built-in Wi-Fi
  • USB port for firmware upgrade and computer control
  • LiteRoc heavy-duty stainless steel tripod w/ vibration suppression pads (7.5kg)
  • Die-cast metal tripod spreader with accessory tray


German Equatorial Mount
Max payload 12.7 kg (28 lbs) excluding counterweight
Mount weight
4.5 kg (10 lbs)
Payload/Mount weight ratio 2.80
Body material
All metal, Casting + CNC machined, powder-coated
Periodic error (PE) <±10 arcsec
PEC Yes, Permanent PEC
Worm period 600 sec
Right Ascension worm wheel Φ 88 mm, 144 teeth aluminium
Declination worm wheel Φ 88 mm, 144 teeth aluminium
Right Ascension axis shaft Φ 35 mm steel
Declination axis shaft Φ 35 mm steel
Right Ascension bearing Φ 55 mm ball bearing
Declination bearing Φ 55 mm ball bearing
Worm gears Φ 15.2 mm, Brass
Motor drive 1.8º stepper motor, 128 x microdivision
Resolution 0.17 arc seconds
Transmission Synchronous belt
Latitude adjustment range 10º ~ 70º
Azimuth adjustment range ± 6º
Polar Scope iPolar electronic polar scope
Level indicator Level bubble
Hand Controller Go2Nova 8409 with ~212,000 objects database
Tracking Automatic
Slew speeds 1×,2×,8×,16×,64×,128×,256×,512×, MAX (6º/sec)
Power consumption 0.6A (tracking), 0.9A (GOTO)
Power requirement 12V DC, 5A, 5.5 x 2.1mm plug
Power-down memory Yes
Wi-Fi Yes, built-in
Communication port Yes (Wi-Fi and USB)
Autoguide port Yes (ST-4 compatible)
PC computer control Yes (ASCOM)
Counterweight shaft Φ 20 x 200 mm (M16), Stainless Steel
Counterweight 4.5 kg (10 lbs)
Tripod LiteRoc heavy-duty stainless steel tripod w/ vibration suppression pads (7.5kg)
Dovetail saddle 3.8" Vixen-style, center adjustable
GPS Optional external 32-channel GPS
Autoguiding Optional external iGuider 1
Operation temperature -10ºC ~ 40ºC
Warranty Two year limited

  • iOptron GEM28 mount
  • Go2Nova 8409 Hand Controller
  • One 10lbs (4.5 kg) counterweight
  • Stainless steel counterweight shaft
  • Internal iPolar electronic polar scope
  • AC adapter (240V)
  • 2X coiled control Cable (6P6C RJ11 to RJ11, straight wired)
  • USB cable for mount
  • USB cable for iPolar
  • LiteRoc 1.75" tripod with improved stability and leg locks
  • Quick Start Guide


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