What the thread found

• Fabric strips provided with BFD follow focus units can slide and require fastening, while hard plastic rings similar to ARRI and Chrosziel designs offer faster changes and better stability
• Hard plastic focus rings can be fitted to BFD systems using the existing screw fastener without device modification
• Standard 19mm tape adheres well to hard plastic focus rings
• BFD handwheel diameter varies between units: pre-May 2002 models have approximately 2.917 inch diameter knobs while post-May 2002 models have approximately 2.940 inch diameter knobs
• Hard rings designed for BFD must account for the different handwheel sizes to fit properly
• Wider hard plastic rings do not make focus pulling more difficult compared to fabric strips

Depends on

• Ring diameter specifications noted only for specific handwheel versions
• Material composition of custom-made rings not fully documented
• Third-party ring availability and pricing unclear at time of discussion
• Discussion involves experience with specific motor and lens combination

Gear in this thread

HU3, BFD

Parts

Follow Focus

Same gear or parts

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4. 2025LC-1 (Lens Control-1) follow focus system: wired architecture, motors, and early operational experience (1990s).FacebookThe Steadicam Group