There are follow focus' made by Cavision and RedRock and Chrosziel and Zocuto all of which seem to have square 'ports' on them into which you can insert a follow-focus whip.

Do they all use the same or similar sized pinions? (the square end of the whip that fits into the follow focus) Can anybody with a whip from one of these companies tell me what the size of the pinion is?

Thanks

You'd get a better answer over at 2-pop.com probably. More film-oriented gearheads there.

David,

Redrock states that their whips are "Standard Arri size".

The only size I could find is for Willytec equipment, they say theirs uses "standard 12mm square coupling for compatibility with existing whips and speed cranks".

http://www.willytec.com/-film.html

I have no idea if this is industry standard though... please be sure to post here if you are able to get answers elsewhere.

Interesting info that the Willytec is "standard 12mm square coupling for compatibility with existing whips and speed cranks". I had a Cavision follow focus' square hole measured for me and it was reported to be 6mm x 6mm.

I think it's odd that the Cavision might NOT be standard. Since Cavision doesn't even appear to sell whips themselves it would only make sense that they'd put on a port that fit with whatever was considered 'standard', otherwise it'd be useless.

I'll report if I find any more info.

Thanks