RST-135 Compact Harmonic Drive Telescope Mount Head


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The RST-135 uses a new type of gear, strain wave gear. Due to the strong force of the strain wave gear and the motor, counterweight is not needed. The mount weights only 3.3kg, but you can use a 13.5kg telescope. Rainbow Astro call this breakthrough mount a Weightless Mount. The volume and weight of the mount is no longer a problem in a trip for astrophotography.

Available on backorder


Rainbow Astro’s RST-135 equatorial mount is based on innovative Harmonic Drive technology. Harmonic Drive technology results in a small light weight mount with an extremely high carrying capacity. The RST-135 weighs only 3.3 kg and is very small and light, but it can carry a payload up to 13.5 kg without using a counterweight. In addition, Harmonic Drive technology produces zero backlash allowing precision auto-guiding.

An optional counterweight kit is available to support Higher payloads up to 18 kg.

The RST-135 is your ideal astro-travel companion. 


  • Mount Type: Equatorial / Alt-Az Dual Mount
  • Type of Gear: Strain Wave Gear
  • Payload: 13.5kg (30lbs) – No need counterweight, 18kg (40lbs) – with counterweight
  • Slew Speed: 6º / Second
  • Latitude Range: 0º to 90º
  • Power Input: 12 to 16V DC
  • Power Consumption: 16V 0.2A – Tracking, 3A – Slewing,
  • Weight: 3.3kg (7.3lbs)
  • Size(mm): 130 x 120 x 190
  • Materials: AL 6061, Steel, Brass
  • ASCOM: Support ASCOM Driver
  • Hand Controller: Included
  • Additional Function: Built-in WiFi, Built-in GPS Receiver, Built-in Home Sensor

Additional information

Weight 3.3 kg


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