This is a Lens Focus Gear SIZE B.
For those of you shooting video with a follow focus, we carry these lens gears made by Redrock micro. They feature an industry-standard film pitch (0.8 mod 32).
Size A: lens circumference of 180mm – 220mm (7" – 8.6")
Size B: lens circumference of 211mm – 250mm (8.3" – 9.8")
Size C: lens circumference of 241mm – 280mm (9" – 11")
Size D: lens circumference of 280mm – 320mm (11" – 12.6")
Lens / Gear Size Recommendations
Zeiss ZE Gear B (except 100 Makro which is C)
Zeiss ZF.2 21 and 35mm / Gear A
Zeiss ZF.2 35mm, 50mm and 85mm / Gear B
Zeiss ZF.2 100mm / Gear C
EF mount Voigtlander 20mm and 40mm / Gear B
Micro 4/3 Voigtlander 10.5mm, 17.5mm, 25mm, 42.5mm / Gear A
Canon 14mm f/2.8L / Gear C
Canon 16-35mm f/2.8L II / Gear B
Canon 16-35mm f/2.8L III / Gear C
Canon 20mm f/2.8 / Gear B
Canon 24mm f/1.4L / Gear C
Canon TS-E 17mm f/4 / Gear D
Canon TS-E 24mm f/3.5 / Gear B or C
Canon TS-E 45mm f/2.8 / Gear B or C
Canon TS-E 90mm f/2.8 / Gear B
Canon 28mm f/1.8 / Gear B
Canon 24-70mm f/2.8L II / Gear C
Canon 28-70mm f/2.8L / Gear C
Canon 24-105mm f/4L IS / Gear C
Canon 35mm f/1.4 / Gear C
Canon 35mm f/2.0 / Gear A
Canon 50mm f/1.4 / Gear B
Canon 50mm f/1.2 / Gear C
Canon 50mm f/2.5 macro / Gear A
Canon 100mm f/2 / Gear B
Canon 100mm f/2.8 USM Macro / Gear B or C
Canon 100mm f/2.8 IS L Macro / Gear B
Canon 135mm f/2 / Gear B or C
Canon 85mm f/1.2L II / Gear D
Canon 85mm f/1.8 / Gear B
Canon 70-200 f/2.8L / Gear C
Canon 70-200 f/2.8L IS II / Gear C
Canon 100-400mm f/4.5-5.6L IS / Gear D
Canon 180 f/3.5L Macro / Gear C
Canon 200 f/2.8L / Gear B
