HEM44EC EQ SWG hybrid

The iOptron HEM44EC EQ SWG Hybrid is a high-precision, lightweight hybrid equatorial mount head designed for serious astrophotography and mobile observatory applications. The “EC” version includes a high-resolution encoder on the RA axis for real-time error correction, providing enhanced tracking accuracy.
It combines a strain-wave (harmonic) drive for the RA axis with a backlash-free worm/belt drive system on the DEC axis — hence the “SWG Hybrid” designation (Strain Wave Gear + hybrid drive).
With a payload rating of approximately 20 kg (44 lb) without counterweights, yet a mount weight of only ~6.2 kg (13.65 lb) with saddle, it offers an excellent payload-to-weight ratio.

Key Features

• Hybrid drive design: RA uses strain-wave gear, DEC uses worm/belt with no backlash.

• RA high-precision encoder for real-time periodic error correction (RPEC) — supports high tracking accuracy and potentially unguided imaging.

• Payload capacity 44 lb (20 kg) no counterweights; with recommended payload center of gravity conditions.

• Ultra-light mount head weight: ~13.65 lb (6.2 kg) including dovetail saddle.

• CNC-machined all-metal construction, anodized finish for durability.

• Unique electronic friction brake + power down-memory feature: In event of power loss the mount will safely stop and can resume from its last position/GoTo without full re-alignment.

• Integrated cable-management system with no external cables wrapping the moving parts; built-in WiFi (via hand controller), USB interface for firmware upgrades and PC/computer control.

• Supplied with iOptron Go2Nova hand controller (approx. 212,000 object database) and compatibility with ASCOM, INDI drivers, mobile/tablet apps (SkySafari etc).

• Dual saddle (Vixen & Losmandy-style dovetail) for flexible OTA mounting.

• Latitude adjustment range ~15° to 65° (some low latitude version available by special order) and azimuth adjustment ±6°.

Technical Specifications (Summary)

• Mount type: Hybrid strain-wave equatorial mount head (SWG = Strain Wave Gear)

• RA gear system: StrainWave gear, reduction ratio ~640:1

• DEC drive system: Backlash-free worm/belt system.

• Payload: 44 lb (20 kg) without counterweight; up to ~55 lb (25 kg) with counterweight (under manufacturer’s defined conditions).

• Mount head weight: 13.65 lb (6.2 kg) including dovetail saddle.

• Gear period: 270 seconds (for RA period)

• Maximum slew speed: ~4.5°/second.

• Power: DC 12 V (≈5 A) rated, tracking ~0.6 A, GOTO ~1.2 A.

• Operational temperature: –20 °C to +40 °C (controller –10 °C to +40 °C)

• Latitude adjustment: 15°-65°; Azimuth adjustment ±6°.

• Autoguide port: ST-4 compatible.

• Included: Mount head, hand controller, cable, etc (specific kit may vary). Tripod, counterweight shaft and weights often optional.