Cine has a gear ratio of 2:1 for cine style lenses,which means one turn of the focus knob will resultin two turns of the focus gear. This gear ratio is commonto all classic follow focus units from ARRI (FF-3, FF-4, etc.)and is traditionally suited to cine lenses such as Ultra Primes,Compact Primes, Alura Zooms, Angenieux Zooms, etc...HD has a slower gear ratio of 1:1 for 2/3” broadcast and still photo lensesIn this case, one turn of the focus knob will result in a single turn of the focus gear. This particular gear ratio might be preferred when using lenses with a short focusthrow, where the scale from minimal focus to infinity is so short that atraditional 2:1 ratio could be too direct, lackingin precision. Typical lenses suited to the HD ratioare modern still prime lenses, some ENG zooms, extreme wide-anglelenses or some older designs.
Arri Follow Focus FF-5 Cine Set Basic
- K2.65246.0 1x FF-5 Cine Follow Focus baseK2.65253.0 1x Standard Focus Knob (left side)K2.65276.0 1x 35 teeth, 0.8/32 pitch Metric ModuleGear for Prime Lenses and smaller ZoomsK2.65259.0 1x 43 teeth, 0.8/32 pitch Metric ModuleGear for larger Prime Lenses and 35mm Zoomsadditional accessories e.g. Bridgeplate Adapters for19 mm or 15 mm have to be ordered separatelyFor Marking Disks please see chapter inch Marking Disksfor Follow Focus inch.