iOptron CEM120 Center Balanced EQ Mount

Brand: iOptron

SKU : IO-7300

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  • 115 lbs payload capacity
  • Tracking accuracy of less than 0.15 arcsec RMS
  • 12 port cable management saddle
  • LAN, RS232, USB and Wifi Control options for remote observatory setups
  • Built-in 32 Channel GPS 
  • Note: If you are going to mount this atop an already purchased Tri-Pier (8034) you will need an adapter plate #IO-8036-120. (You can find this below in the Recommended Products card.) Otherwise we advise to get the IO-8037 Tri-pier which already had the adapter plate attached.

    Product Details

    • Mount Specs:
      • Mount: Center-balanced Equatorial Mount (CEM)
      • Payload: 52kg (115 lbs), excludes counterweight
      • Mount Weight: 26kg (57 lbs)
      • Payload/Mount weight ratio: 2/1
      • Material: All metal
      • Latitude Adjustment Range: 0- 68 deg (0.5 arcmin division)
      • Azimuth Adjustment Range: (+/-) 5 deg (3 arcmin division)
      • Tracking accuracy (PE): < (+/-)3.5 arcsec
      • Worm Period: 240 sec
      • PEC: Permanent PEC
      • Right Ascension Worm Wheel: 216mm, 360 teeth, zero backlash
      • Declination Worm Wheel: 216mm, 360 teeth, zero backlash
      • Worm: 26mm
      • Right Ascension Axle:80mm, steel
      • Declination Axle: 80mm, steel
      • Right Ascension Bearings: 125mm
      • Declination Bearings: 125mm
      • Counterweight shaft: 38.1x 540 mm (SS, anti-slip, 4.5kg)
      • Counterweight: 10 kg (22 lbs)
      • Mount Base Size: 210 x 230 mm
      • Motor Drive: Precision stepper motor w/128 micro-step
      • Resolution: 0.07 arc seconds
      • Slew speed: 4°/sec (960x) max.
      • Hand Controller: Go2Nova 8407 V2, 8 line 21 character LCD
      • Power Requirement: DC 12V, 5A
      • Power Consumption: 0.7A (Tracking), 1.8A (GOTO)
      • Polar Scope: Optional electronic polar scope
      • Meridian Treatment: Stop (0-14 deg pass), auto flip
      • Zero Position: Automatic zero search
      • Park Position: Horizontal, vertical, current, alt/azi input
      • Level Indicator: Yes
      • Dovetail Saddle: Losmandy D, 17.2" (437mm)
      • GPS: Yes
      • Guiding Port:ST-4
      • Communication Port: RS232, USB, LAN, WiFi
      • Cable Management: 2xDC12V (1A), DC5V(1A), 2xDC (5A), ST4, 6P6C, 4xUSB2.0, USB3.0 (powered), USB for PS, AUX
      • Pier/Tripod: Optional pier
      • Warranty: Two year limited


      With the growing demand for accuracy, heavy capacity, stability, and versatility in an equatorial mount, iOptron created the CEM120 to meet all these needs. The CEM 120 like all center balance designs are naturally stable is due to putting the weight of the telescopes directly over the center of the pier or tripod.

      The mount’s performance is demonstrated by its low periodic tracking error that is +/- 3.5 arc seconds RMS. The CEM120 features an advanced cable management system consisting that prevents tangle ups and reduces the chance of fractured cables. It also adds some new features to the CEM family like Wi-Fi and LAN for remote operation.

      • specifications

        Azimuth Range Plus or minus 5 degrees
        Dec Worm Wheel216mm/360 teeth
        Free ShippingYes
        Head DesignEquatorial
        Instrument Capacity115 lb
        Latitude Range 65 degrees
        Mount Head Weight52.6lb
        RA Worm Wheel216mm/360 teeth
        Saddle WidthD Series
        Telescope ConnectionLosmandy Style
        Tracking ModesEQ North & EQ South
        Tracking RatesLunar & Sidereal & Solar
        Warranty2 Year Warranty
        weight57 lb
        Worm Period240 seconds
      • included items

        • CEM120 mount head x1
        • Go2Nova 8407 V2 hand controller x1
        • 10 kg counterweight x2
        • Counterweight shaft x1
        • Hand controller cable x1
        • Serial cable (#8412) x1
        • AC power adapter

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