Check the listing for details. Used ClearSky Mechanic Home Version ST17 Harmonic Equatorial Mount. Condition: Used. Listed at 950.00 USD. ST17 Clear Sky Harmonic Equatorial Mount (Mechanical Limit Version) • Net weight: 4.7 kg • ONSTEP control system, supports platforms such as NINA / ASIAIR • Dual 17-100 harmonic drives, custom-designed ultra-low backlash harmonic transmission for astronomical use • Standard hand-carry shock-absorbing storage bag included • RMS error: 0.3–0.5 • Right Ascension gear ratio: 300 (with brake) • Declination gear ratio: 300 • Equipped with laser polar alignment function • Base: AM5 standard • Center 3/8” threaded hole + three M6 threaded holes • Compatible with photography tripods, TC40, Clear Sky 40, and other tripods • Warranty: 2-year warranty, lifetime maintenance support • Payload capacity: • 13 kg (unguided) • 20 kg (guided)