RST-135E Weightless Mount
Rainbow Astro
RST-135E Weightless Mount is a GoTo equatorial mount for guided astrophotography rigs.
mount flagship
Best Current Offer
Starizona
In stock
Specifications
Mount
- Mount type
- Dual German equatorial / alt-az strain-wave mount
- Drive system
- Strain wave gear / harmonic drive
- Payload capacity
- 13.5 kg without counterweight; 18 kg with counterweight
- Mount weight
- 3.4 kg
- Latitude range
- 0 to 90 degrees
Capacity
- Payload-to-weight ratio
- 5.3:1
Motion
- Slew rate
- 1,800x (7.5°/s) at 16 V DC
- Periodic error
- ±2.5 arcsec (430 sec period)
- Encoder
- Renishaw high-resolution encoder on RA axis
Electronics
- Controller
- Computerized GoTo control
- Power
- DC 12-16 V
Mechanical
- Interface
- ASCOM Driver
Astrophotography Fit
A general-purpose GoTo mount that should be chosen by realistic imaging payload, not headline capacity alone.
RST-135E Weightless Mount is a flagship GoTo equatorial mount for computerized tracking and guiding.
For long-exposure astrophotography, use a conservative imaging payload. The telescope, camera, guide hardware, dew heaters, dovetails, and cables all count, and guiding performance matters more than the catalog payload number.
Best paired with
- Autoguided refractors or corrected reflectors within conservative payload limits
- Stable tripod or pier and balanced counterweights
- Computer or hand-controller workflow with good polar alignment
Not recommended for
- Payloads at the rated maximum for imaging
- Users who need an airline-portable rig above all else
- Long focal length work without guiding and careful balance
Where To Buy
Some links on this page are affiliate links. Prices and availability are pulled automatically from each retailer and updated daily.
| Retailer | Price | Availability | View Offer |
|---|---|---|---|
| Starizona Starizona | $5,990.00 | In stock Updated 5/13/2026 | View Offer - $5,990.00 |