Regular price
$ 2,788.00
Sale price
$ 2,788.00
Unit price

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Introducing iOptron's new compact next-generation German equatorial mounts the GEM28 and GEM28EC. Like their predecessors the GEM28 is designed with portability in mind, weighing in at only 10 lbs it can support up to a 28lb payload an incredible 2.8 mount weight to payload ratio. We achieved this using design methods developed to reduce mount mass on our CEM family of mounts. The German EQ versions were created to satisfy consumers that prefer a more traditional mount and or those whom need a mount that functions at higher latitudes (Over 60°). 

Building on the legacy of earlier GEM models we 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 unparallel connectivity, and recordable permanent periodic error correction (PPEC) to repeat optimal PEC training sessions (real time PEC on the GEM28EC) Regarding functionality the GEM28 andGEM28EC deliver precise pointing and accurate tracking (PE <0.3 arcsec RMS on the EC model). An onboard 212,000 object library ensures you'll never run out of targets to see or image

The GEM28 and GEM28EC set the new standard for compact German equatorial mounts. 


  • German equatorial design, latitude range of 10°~70° 
  • Ideal for both visual observation and astrophotography 
  • Large easy to use quick-lock gear clutches 
  • Integrated iPolarTM electronic polar finder (optional visual polarscope available) 
  • Max payload of 28 lbs (12.7 kg) with the mount weight of only 10 lbs (4.5kg
  • Precision stepper motor for precise GOTO and accurate tracking 
  • Go2Nova® 8409 controller with advanced GOTONOVA GOTO technology 
  • PEC +/- 10 arc-sec (GEM28), <.3 arc-sec rms (GEM28EC) 
  • Permanent PEC (PPEC) GEM28, real time PEC (RPEC) GEM28EC 
  • Integrated ST-4 auto guiding port 
  • Built-in Wi-Fi 
  • Available with 1.5” standard or 1.75" Lite Roc tripod 
Mount German Equtorial Mount
Max payload* 12.7 kg (28 lbs), exclude CW
Mount weight 4.5 kg (10 lbs)
Payload/Mount weight 2.8
Structure Material All metal, Casting + CNC machined
Exterior Finish Powdwer coating
Latitude adjustment range 10° ~ 70°
Azimuth adjustment range ± 6º
Tracking accuracy (PE)** GEM28 <±10arcsec / GEM28EC <0.3 arcsec RMS
Period 600 sec
Worm diameter Φ15.2 mm, Brass
Right Ascension worm wheel Φ88 mm, 144 teeth, zero backlash
Declination worm wheel Φ88 mm, 144 teeth, zero backlash
Right Ascension axis shaft Φ35mm steel
Declination axis shaft Φ35mm steel
Right Ascension bearings Φ55mm ball bearing
Declination bearings Φ55mm ball bearing
Counterweight shaft Φ20X200 mm (M16), Stainless Steel
Shaft extension Φ20X120 mm (M16), Stainless Steel
Counterweight 4.5kg (10 lbs) X1
Motor Precision stepper motor, 1.8º/128X micro-step
Motor resolution 0.17 arcsec
Transmission Synchronous belt
Hand Controller Go2Nova® 8409, 4 line 21 character LCD
Star Database 212,000+, star identification
Power DC 12V, 5A
AC adapter 100V ~ 240V (included)
Power consumption 0.6A(Tracking), 0.9A(GOTO)
Polar scope AccuAlign TM polar scope/Internal iPolar TM
Meridian treatment Stop (0-10° pass), flip
Dovetail saddle 3.8" Vixen, center adjustable
Max slew speed 6°/sec (1440x)
Guiding port ST-4
Communication port USB, WiFi
WiFi Built in WiFi
Tripod 1.5" Stainless Steel, optional LiteRoc
Hard case GEM28 optional, GEM28EC included
GPS optional/external
Autoguiding Optional external iGuider
Operation temperature -10ºC ~ 40ºC
Warranty Two year limited
Price $1148(iPolar)/$2048 (EC)

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