GEM45EC German equatorial mount


The GEM45EC mount utilizes a high-resolution encoder that delivers a PE <0/25 arcsecond rms. This iOptron German Equatorial mount ties contemporary technology and a classic mount design together in a lightweight and compact package that is sure to please observers and astrophotographers. Comes with iPolar, hard case, and tripod.

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GEM45EC German equatorial mount

Innovative ideas applied to a time tested design, the iOptron® GEM45EC next generation German equatorial mounts. A sharp looking CNC body is the first indicator the GEM45 is a top quality mount in both form and function.

Utilizing experiences gained during development of our CEM series, we were able to remove unnecessary bulk giving the GEM45 an incredible 2.8 payload to mount weight ratio. This compact 15.8lb mount can precisely GOTO an object and track with up to 45lbs of gear onboard. With its integrated electronic polar scope (iPolarTM), 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. There is little chance of your cables getting snagged with the GEM45’s internal advanced cable management system. A new, patent pending Universal Self-Centering Saddle (USCS) accommodates Losmandy and Vixen style dovetail plates. GEM45EC mounts utilize reliable stepper motor drive systems with our low power consumption technology. Looking for ultra precise tracking, the GEM45EC with its high resolution encode delivers a PE<0.25 arcsec rms. Our 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 a GEM45 mount.


  • German equatorial mount with innovative features
  • Idea for both visual observation and astrophotography
  • Maximum payload of 45 lbs (20 kg) with the mount weight of only 15.8 lbs (7.2 kg)
  • Easy to use quick-lock gear clutches
  • Integrated iPolarTM electronic polar finder
  • Low periodic error (<0.25 arc seconds rms)
  • Realtime periodic error correction (RPEC)
  • 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
  • New, patent-pending iOptron universal 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
  • Hard case included
  • NEW iOptron subsidized TheSky Imaging Edition

Shipping Contents

  • iOptron® GEM45EC mount (#7620ECA, high precision model with red gear switches)
  • Go2Nova® 8407 Hand Controller
  • One 11lbs (5 kg) counterweight
  • Stainless steel counterweight shaft
  • Internal iPolar electronic polar scope
  • GEM45 GPS module
  • AC adapter (100V-240V)
  • 2X coiled control Cable (6P6C RJ11 to RJ11, straight wired)
  • Serial cable (RS232 to RJ9)
  • USB cable
  • LiteRoc 1.75″ tripod with improved stability and leg locks
  • Aluminum carrying case
  • Quick Start Guide
الوزن13.95 كيلوجرام
الأبعاد44 × 34 × 20 سنتيميتر


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MountGerman Equatorial Mount
Max payload*45 lbs (20 kg), exclude counterweight
Mount weight15.8 lb (7.2 kg)
Payload/Mount weight2.78
Structure MaterialAll metal, CNC machined
Exterior FinishAnodized red/black
Latitude adjustment range14º ~ 68º
Azimuth adjustment range± 6º
Tracking accuracy (PE)**<0.25 arcsec rms
PECReal-time PEC (RPEC)
Period400 sec
Worm diameterΦ17mm, Brass
Right Ascension worm wheelΦ110mm, 216 teeth, zero backlash
Declination worm wheelΦ110mm, 216 teeth, zero backlash
Right Ascension axis shaftΦ45mm steel
Declination axis shaftΦ45mm steel
Right Ascension bearingsΦ68mm
Declination bearingsΦ68mm
Counterweight shaftΦ28X280 mm, Stainless Steel (1.2 kg)
Counterweight11lbs (5kg) X1
MotorPrecision stepper motor, 1.8º/128X micro-step
Motor resolution0.08 arcsec (200 PPS)
TransmissionSynchronous belt
Hand ControllerGo2Nova® 8407+, 8 line 21 character LCD
Star Database212,000+, star identification
PowerDC 12V, 5A
AC adapter100V ~ 240V (included)
Power consumption0.6A(Tracking), 0.9A(GOTO)
Power-down memoryYes
Polar scopeInternal iPolar TM electronic polar scope
Meridian treatmentStop (0-20° pass), flip
Zero positionAutomatic zero search
Dovetail saddleiOptron Universal Saddle, 5″
Max slew speed4.5°/sec (1080X)
Guiding portST-4
Communication portUSB
WiFiExternal (optional)
Cable ManagementDC12V (3A), ST4,USB
Tripod1.75″ Stainless Steel(~8kg), or optional Tri-pier
Hard caseIncluded
Operation temperature-10ºC ~ 40ºC
WarrantyTwo year limited

* OTA size and length dependent
** Measured with encoder on the bench, 400 seconds

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