iOptron GEM28 German Equatorial GoTo Mount
iOptron GEM28 German Equatorial GoTo MountiOptron GEM28 German Equatorial GoTo MountiOptron GEM28 German Equatorial GoTo Mount
iOptron GEM28 German Equatorial GoTo MountiOptron GEM28 German Equatorial GoTo Mount

iOptron GEM28 German Equatorial GoTo Mount

  (1 Review)
✓ 2 year warranty


Out of stock due 30-40 working days

About this product

Model:  iop_gem28_tp_hc_aa
Part Number:  G282B1

NEW compact German Equatorial Mount (GEM) weighs only 10 lb yet supports up to 28 lb payload!

IOptron achieved this high weight to payload ratio using design and manufacturing methods developed to reduce mass from their similarly specified CEM mounts. So if you have admired the iOptron CEM series but prefer the more traditional GEM design, or need a mount that works at higher (over 60º) latitudes, then the iOptron GEM28 is for you. 

Features include precise whisper quiet stepper motors (periodic error < ± 10 arc seconds) large easy to use quick-lock gear clutches, built-in WiFi for easy connectivity and recordable Permanent Period Error Correction (PPEC). 

Can be purchased with iOptron AccuAlign optical polarscope or iPolar electronic polar finder. 

The GEM28 is also equipped with the latest advanced Go2Nova® 8409 with 212,000 object database & star identification. The Go2Nova® Hand Controller is intuitive to use and its large 4-line LCD screen simplifies the process of setting telescopes and locating objects.


  • Compact German Equatorial Mount
  • Payload of 28 lbs (12.7 kg) with the mount-only weight of 10 lbs (4.5 kg)
  • Precise stepper motors with low power consumption
  • Low periodic error (< ± 10 arc seconds)
  • Permanent Period Error Correction (PPEC)
  • Ideal for entry-level and intermediate astrophotography
  • Large easy to use quick-lock gear clutches on R.A. and DEC axes
  • Operational range from 10° to 70°
  • Choose iOptron AccuAlign optical polarscope or iPolar electronic polar finder
  • Go2Nova® 8409 with 212,000 object database & star identification
  • Integrated WiFi for full function control via SmartPhone/Tablet/Computer
  • ST-4 autoguiding port
  • USB port
  • Optional 32-channel Global Positioning System (GPS)
  • Serial port for firmware upgrade and computer control
  • Spring loaded Vixen-style saddle
  • Available with 1.5 inch stainless steel tripod or 1.75" LiteRoc tripod
  • Die-cast metal tripod spreader with accessory tray

Go2Nova Hand Controller 8409

  • 212,000 object database & star identification
  • Large LCD screen with 4 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

Hard Case

Includes a hard with custom-fit foam padding to hold the mount in place and cushion it from impacts. The exterior has reinforced edges on the outside to help minimise denting and damage. There are dual trigger latches to secure the lid in place, and a carry handle.



What's in the box

  • Telescope mount with Optical Polarscope or iPolar
  • Hand controller (HC) – Go2Nova® 8409 
  • Tripod with accessory tray – 1.5‐inch or 1.75 inch LiteRoc 
  • Counterweight – 10.4 lbs X1 (4.7 kg) 
  • Counterweight shaft 
  • Controller cables x2 
  • RS232‐RJ9 serial cable 
  • AC adapter – 100‐240V 


Mount German Equatorial Mount
Payload * 28 lbs (12.7kg), exclude counterweight
Mount weight 10 lbs (4.5kg)
Payload/Mount weight 2.80
Structure Material All metal, Casting + CNC machined
Exterior Finish Powder coating
Periodic error (PE) ** <±10 arcsec
PEC Yes, Permanent PEC
Worm period 600 sec
Right Ascension worm wheel Φ88mm, 144 teeth aluminum
Declination worm wheel Φ88mm, 144 teeth aluminum
Right Ascension axis shaft Φ35mm steel
Declination axis shaft Φ35mm steel
Right Ascension bearing Φ55mm ball bearing
Declination bearing Φ55mm ball bearing
Worm gears Φ15.2mm, Brass
Motor drive 1.8º stepper motor, 128X microdivision
Resolution 0.17 arc seconds
Transmission Synchronous belt
Latitude adjustment range 10º ~ 70º
Azimuth adjustment range ± 6º
Polar Scope iPolar TM electronic polar scope
Level indicator Level bubble
Hand Controller Go2Nova® 8409 with ~212,000 objects database
Tracking Automatic
Slew speed 1×,2×,8×,16×,64×,128×,256×,512×,MAX(6º/sec)
Power consumption 0.6A (Tracking), 0.9A (GOTO)
Power requiremention 12V DC, 5A
AC adapter 100V ~ 240V (included)
Power-down memory Yes
Wi-Fi Built-in
Communication port Yes (Wi-Fi and USB)
Autoguide port Yes (ST-4 compatible)
Firmware upgrade Yes
PC computer control Yes (ASCOM)
Counterweight shaft Φ20x306mm (M16), Stainless Steel
Shaft extension Φ20x120mm (M16), Stainless Steel
Counterweight 10 lbs (4.5kg)
Tripod 1.5" Stainless Steel (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

Downloads / Manuals




Download Latest Firmware 

iOptron Telescope ASCOM Driver:

Install ASCOM Driver and Commander 

Customer reviews

Average Rating (1 Review):  
Write a Review and share your opinions!

Rating (max 5):  
Robust Build Quality
Wednesday, 21 April 2021  | 

My first few days with the mount. Works well with AsiAir Pro. Build quality is extra-ordinary given the price-point and ultra-portability of the mount. I cannot thanks enough FLO for the assistance they provided while getting the mount. I was waiting for CEM26, but GEM28 proves to be better in balance (and 2lbs more payload!!)
Great Job FLO.


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