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Video lens Iris control


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#1 Nick Bennett

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Posted 01 August 2006 - 03:15 PM

I worked with an operator a few years ago that had a small thumb width roller that pluged between a Canon lens and the camera body that gave him control over iris.

I think this was custom made but has anyone anything similar or know where I could get one?

Cheers

Nick
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#2 Brad Grimmett

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Posted 01 August 2006 - 07:05 PM

Sounds like a bebop. Sorry, I don't have a link for it.
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#3 Jason Torbitt

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Posted 02 August 2006 - 01:42 AM

Hi Nick
It should be relatively simple for someone who knows what they're doing to knock something up. You'd need the pinout assignment for the 12 pin Hirose, and then cable it to some form of potentiometer to gain control of the iris. The thumb roller, as opposed to the usual thumb rocker used in zoom applications, you describe sounds similar to the J7 focus unit or the focus unit found at the base of some Stanton Jimmy Jibs.

I worked on 'Emmerdale' the other day where they have their own custom iris control - which plugs into the connector you described, and runs to a small patch box velcro'd to the camera, then out via an XLR lead, hardwired to the video village, where the DoP can watch the monitor and make iris adjustments as and when (s)he feels neccessary.

Of course it is also possible to do it all wirelessly, one way being the usual dual channel kit, something like the new MK-V system or a Genio - but the Bartech can also be done by the operator from the gimbal, using one of Jim's gimbal mounted units, but it would be more time consuming to rig up, as it means using a lens motor and focus gear on the rig, rather than plugging directly into the camera.

Hope this helps - if you come across a solution anywhere let me know, it would be a useful bit of kit to have.
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#4 Nick Bennett

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Posted 02 August 2006 - 02:07 AM

Thanks for the reply Jason that does sound like the gadget this bloke had, it was a good bit of kit for those solo shoots.
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#5 Jason Torbitt

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Posted 02 August 2006 - 02:10 AM

It would probably be possible to modify a J7 focus control to do the job, swap the connector on it...I know MK-V have some of these J7s, I got one the other day.

It's also occurred to me there's a gadget called Vocas which does zoom/focus or zoom/iris electronically - it's a handle design but it is do-able from the gimbal, and they seem to sell a nice enough kit package - www.vocas.com

Does anybody have any neat/cheap solutions, to run a cable from the standard video 12 pin connector to some form of controller at the gimbal?
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