iOptron GEM45 German Equatorial GoTo Mount

Product code: 7620A
£1,374.17 (ex. VAT)
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Product information

The GEM45 is the first of iOptron's next generation German equatorial mounts. 

Using experience gained during the development of their CEM series, iOptron have removed unnecessary weight resulting in a portable 7.2 kg / 15.8 lb mount with an impressive 2.8 payload-to-mount weight ratio. 
With its integrated electronic polar scope (iPolar) polar alignment is a breeze, even when the pole star is obscured.

IOptron's reliable ultra-quiet stepper motors provide precise pointing and tracking together with low power consumption. Large levers make it easy to engage the drive gears into place, even when wearing gloves. 

Integrated internal cable management means there is little chance of your cables becoming snagged and a new, patent pending, Universal Self-Centering Saddle (USCS) accommodates both Losmandy and Vixen style dovetail plates. 

A new 'LiteRoc' 1.75" tripod delivers high stability in a lighter, more compact package.

Other features include computerised GOTO with a 212,000+ object library (includes star identification) GPS and Wi-Fi (requires optional iStarFi adapter).


  • Next generation German Equatorial Mount
  • Suitable for both visual observation and astrophotography
  • Maximum payload of 45 lbs (20 kg) with a mount weight of only 15.8 lbs (7.2 kg)
  • Easy to use quick-lock gear clutches
  • Integrated iPolar electronic polar finder
  • Low periodic error (< ± 7 arc seconds)
  • Permanent periodic error correction (PPEC)
  • Ultra-quiet precision stepper motors 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
  • Integrated cable management system
  • New, patent-pending iOptron universal saddle
  • All metal, CNC machined body with red/black anodised surfaces
  • Optional WiFi for mount control via SmartPhone/Tablet/Computer
  • All new LiteRoc 1.75" tripod with improved stability and leg locks

Go2Nova Hand Controller

  • 200,000+ object database
  • 8 line, 21 character back lit large screen LCD
  • Low temperature operation as low as -20ºC
  • User friendly interface
  • 9 speed slew control with quiet mode
  • Large object database
  • Serial port for firmware upgrade

What's in the box

  • Supplied in two boxes. 
  • GEM45 mount head
  • CW shaft
  • 1x 5kg / 11lb Counterweight
  • GO2Nova 8407+ hand controller with cord. 
  • GPS Module
  • RJ11 Cable x2
  • RS232-RJ9 Cable
  • USB Cable
  • Alignment Peg
  • 1.75" tripod and accessory Tray
  • Optional Hard Case


  • Mount:   German Equatorial Mount
  • Max payload:   45 lbs (20 kg), exclude counterweight
  • Mount weight:   15.8 lb (7.2 kg)
  • Payload/Mount weight:    2.78
  • Structure Material:    All metal, CNC machined
  • Exterior Finish:    Anodised red/black
  • Latitude adjustment range:    14º ~ 68º
  • Azimuth adjustment range:    ± 6º
  • Tracking accuracy (PE):    <±7 arcsec
  • PEC:    PPEC
  • Period:    400 sec
  • Worm diameter:    17mm, Brass
  • Right Ascension worm wheel:    110mm, 216 teeth, zero backlash
  • Declination worm wheel:    110mm, 216 teeth, zero backlash
  • Right Ascension axis shaft:    45mm steel
  • Declination axis shaft:   45mm steel
  • Right Ascension bearings:    68mm
  • Declination bearings:    68mm
  • Counterweight shaft:    28X280 mm, Stainless Steel (1.2 kg)
  • Counterweight:    11lbs (5kg) X1
  • Motor:    Precision stepper motor, 1.8º/128X micro-step
  • Motor resolution:    0.08 arcsec (200 PPS)
  • Transmission:    Synchronous belt
  • Hand Controller:    Go2Nova® 8407+, 8 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)
  • Power-down memory:    Yes
  • Polar scope:    Internal iPolar TM electronic polar scope
  • Meridian treatment:    Stop (0-20° pass), flip
  • Zero position:    Automatic zero search
  • Dovetail saddle:    iOptron Universal Saddle, 5"
  • Max slew speed:    4.5°/sec (1080X)
  • Guiding port:    ST-4
  • Communication port:    USB
  • GPS:    Yes
  • WiFi:    External (optional)
  • Cable Management:    DC12V (3A), ST4,USB
  • Tripod:    1.75" Stainless Steel(~8kg), or optional Tri-pier
  • Hard case:    Optional
  • Operation temperature:    -10ºC ~ 40ºC
  • Warranty:    Two year limited

Product Info

MPN 7620A
Brand iOptron
Product Code 7620A
Delivery Weight Package