Rainbow Astro RST-135 Weightless Mount

Rainbow Astro RST-135 Weightless Mount

You don’t need counterweights anymore. 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 up to a 29.7lb / 13.5kg telescope. Rainbow Astro calls this breakthrough mount a Weightless Mount. The volume and weight of the mount is no longer a problem in a trip for astrophotography.



Compact and light

Mount weighs only 7.2lb / 3.3kg. You do not need a separate bag for Mount. Just put it in your backpack.

Equatorial / Alt-Az dual Mount

You can easily change to Equatorial mode and Alt-Azi mode. Show your family a star easily in Alt-Azi mode.

Beauty of machined product

Feel the beauty of machined product. All parts of RST-135 are made by machining solid block. The RST-135 is the perfect premium mount.

No need counterweight

You do not need a counterweight to use a 29.7lb / 13.5kg telescope.

Strain wave gear

It is a new type of gear which is widely used in industrial robots. There is no backlash.

Built-in WiFi

This Mount has built-in WiFi. You can control and auto-guide the mount without cable.

Built-in GPS receiver

Built-in GPS receiver eliminates the need to enter the location of the observer.

Built-in Home sensor

Home sensor finds the mechanical origin by itself. This is useful for remote observation.


  • Mount Type Equatorial / Alt-Az Dual Mount
  • Type of Gear Strain Wave Gear
  • Payload 13.5kg (30lbs) - No need counterweight
    18kg (40lbs) – Use counterweight
  •   18kg (40lbs) – Use counterweight
  • Slew Speed 6º / Second
  • Latitude Range 0º to 90º
  • Power Input 12 to 16V DC

  • Power Consumption 0.2A - Tracking, 16V
    3A - Slewing, 16V
  •   3A - Slewing, 16V
  • 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
  •   Built-in GPS Receiver
  •   Built-in Home Sensor


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