Geared aperture Ring

J

Jlippencott

Member
Can anyone tell me why the aperture ring is usually geared (like the focus) on a cine prime lens?

I can't find anything on-line or in any publications that describes would be used to actuate or adjust this except for one's fingers, so it seems kind of pointless to see a gear there.
I know that the focus ring is moved by a follow-focus or equivalent, but I've never seen two follow-focus units on any rig, or any kind of control unit on the aperture, for that matter.
 
https://www.youtube.com/watch?v=pidu-jiANCQ . Watch the first part and then around 5:15 for the most relevant info.

When using an electronic FIZ setup, you can adjust the iris quicker and remotely, as well as dynamically during the shot.

I've personally used two manual follow focuses on rig - one to control focus and one to control zoom.
 
So you can remotely and precisely adjust the iris during a shot. If the camera is rigged somewhere inaccessible such as on a car or a crane, then this allows adjustment. If you want to adjust iris during a shot such as when the sun moves bin and out of clouds or in moving between interior and exterior.
 
It's not uncommon to see the iris being controlled remotely at all times on bigger sets. Some DP's will keep an iris controller on the DIT cart so it's within reach when they're looking at the picture. One guy I worked on a movie with a year ago would just wear it around his neck wherever he went.
 
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