Clayton Harper
04-06-2007, 08:18 AM
When you see the gear pitch on a follow focus unit decribed as mod 0.6 or mod 0.8 how does that compare/convert to something described as 32 pitch?
I thank you all for your obsessive compulsive tendencies in advance.
Anders Holck
04-06-2007, 08:39 AM
The standard gear pitch is .80M, which is most PL mount lenses (Zeiss, Cooke, Angeniuex etc). Modern lenses use this same gearing for focus, iris and (where applicable) zoom, but you will occasionally see a smaller pitch for iris. The Panavision standard is 32 pitch for focus (which is essentially interchangeable with the metric measurement of .80M), 48 pitch for zoom and 64 pitch for iris.
Video lenses use a metric system also: Canons use a .50M, while Fujinons use a .60M for focus and zoom and a .40M for iris.
What this means realistically is that if you want to be covered for a follow focus, a 32 pitch gear will work for just about any cine lens, and you would also need a .50M gear to use with the manual lenses for the XL1, for instance.
Gears made for underwater housings will have the same pitch etc. as follow focus gears, but they may not mount the same.
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