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2009Follow Focus forum

Hocus Focus wireless follow focus system design and capabilities

17 years old. Gear and prices may have changed since.

What the thread found

  • The Hocus Focus uses a modified RC servo motor with 180-degree maximum rotation, which limits its range and may require pre-selecting a focus range before shooting on large-barrel lenses like Cooke S4 or Angenieux Optimo.
  • The system has been tested successfully on DSLR lenses with adapters, Zeiss ZF lenses, broadcast lenses, and Zeiss Super Speed lenses without problems regarding motor strength, speed, or accuracy.
  • The receiver unit operates on Sony NP battery plates or 12-volt 4-pin XLR power input, features aerospace-grade aluminum construction, and maintains wireless accuracy and security at distances up to 200 meters across 10 user-selectable frequency bands.
  • A planned HoFoPro motor upgrade is designed as a direct replacement for the standard motor and targets heavy cinema lenses while offering silent operation.
  • Focus accuracy is precise enough to return to the same focus position repeatedly at apertures like f1.5.
  • The system requires 0.8-module gear rings sourced from third-party suppliers like Redrock Micro or Zacuto when used with SLR lenses that lack built-in focus rings.

Depends on

  • Early prototype specifications were outdated; the production version differs from initial published specs.
  • The standard motor has limited torque potential, which may cause problems with very stiff lenses.
  • Lenses with large barrels may not allow the motor to reach both focus limits, requiring pre-selection of usable focus range.
  • The HoFoPro motor was in early development stages at the time of these discussions, with no confirmed release date provided.

Parts

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