RST-135E Robotic Mount w/Encoders
RST-135E Robotic Mount w/Encoders
RST-135E Robotic Mount w/Encoders
RST-135E Robotic Mount w/Encoders
RST-135E Robotic Mount w/Encoders

Rainbow Astro

RST-135E Robotic Mount w/Encoders

Regular price
$ 5,495.00
Sale price
$ 5,495.00
Unit price

This item is out of stock but you can place an order now and we’ll ship when it becomes available.


The RST-135 uses a new type of gear called a strain wave gear. Due to the strong force provided by the strain wave gear and motor, a counterweight is not needed. The mount weights only 3.3kg (7.27lbs), but can carry a payload up to 13.5kg (29.76lbs). Rainbow Astro calls this breakthrough mount a Weightless Mount. The volume and weight of the mount is no longer a problem when travelling for astrophotography.


New! - Renishaw Encoders

  • Very low periodic error of +/- 2.5 arcseconds peak to peak
  • Same size and weight as the original RST-135
  • Shoot "unguided" at focal lengths up to 500 mm

Compact and light

  • The mount weighs only 3.3kg (7.27lbs). You do not need a separate bag for the mount: Just put it in your backpack.

Equatorial / Alt-Az dual Mount

  • You can easily change between Equatorial mode and Alt-Az mode, allowing for both photographic and visual use of your instrument.

No counterweight needed

  • You do not need a counterweight to use the mount and it can carry a payload up to 13.5kg (29.76lbs).

Beauty of a machined product

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

Strain wave gear

  • The strain wave gear is a new type of gear that is widely used in industrial robots. There is no backlash.

Built-in WiFi

  • This mount has built-in WiFi in the hand controller. You can control and auto-guide the mount without running a cable to your PC.

Built-in GPS receiver

  • The built-in GPS receiver eliminates the need to enter your location during each session or if you travel with the mount.

Built-in Home sensor

  • The 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 counterweight
    • 18kg (40lbs) – Using a 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
  • Weight
    • 3.3kg (7.3lbs)
  • Size(mm)
    • 130 x 120 x 190
  • Materials
    • AL 6061, Steel, Brass

  • ASCOM 
    • Supports ASCOM Drivers
  • Hand Controller Included
  • Additional Function
    • Built-in WiFi
    • Built-in GPS Receiver
    • Built-in Home Sensor

Personal Upgrade Path

Buy risk-free: When it’s time to trade up you’ll get the most value for your used gear.