iOptron HST MiniTracker Harmonic drive

iOptron HST MiniTracker Harmonic drive

The iOptron HST MiniTracker Harmonic is a portable tracking system designed for astrophotography using DSLR cameras and lenses, or cameras paired with small, lightweight refractors. Its mechanical core is based on a harmonic SWG (Strain Wave Gear) drive, providing smooth, precise motion with no mechanical backlash.

Weighing only 0.79 kg, the MiniTracker can support a 4.08 kg payload. It offers four tracking speeds: sidereal, lunar, solar, and half-speed, which is particularly suitable for nightscape photography including the Milky Way.


The MiniTracker accepts a Vixen-style dovetail and can be mounted on a tripod with either a 3/8" or 1/4" thread. Power can be supplied via an internal Li-Poly battery, three AAA batteries, or a 5 V USB port. A side bracket is provided for the electronic iPolar, and a sighting hole allows quick initial alignment.

Technical specifications

• Harmonic SWG (Strain Wave Gear) drive
• 4 tracking speeds: sidereal, lunar, solar, 1/2×
• Payload capacity: 4.08 kg
• Weight: 0.79 kg
• CNC-machined metal construction
• Mounting: Vixen-style dovetail
• Tripod mounting: 3/8" and 1/4"
• Power supply: internal Li-Poly battery / 3× AAA / 5 V USB
• Side bracket provided for iPolar
• Sighting hole for quick alignment