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Interesting problem with DV clamshell


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#1 Edgar Dubrovskiy

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Posted 30 October 2010 - 04:01 PM

Hi guys! Was assisting today on a promo, shot on old-skuuul 1970's cameras, recording onto DV clamshells.
And at some point we ran into a very unusual problem - every time you point a camera at a bright light (eg. shining down the lens, silhouetting artist) the monitoring would just shut off - as if there is no signal coming down the BNC, whereas the picture on the electronic viewfinder was ok. So it seemed as if BNC was overloading and just shutting itself. It only happened for like 1-3 seconds - basically as long as the light was really shining down the lens. Tried different clamshells - the problem persisted. Any ideas of what was the technical cause of this?
Called the rental house - guys told me that they have never ever encountered a problem like this. Wasn't a big deal - I'm asking more out of curiosity.

Thanks!
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#2 Edgar Dubrovskiy

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Posted 02 November 2010 - 07:51 AM

Any ideas?
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#3 Chris Keth

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Posted 02 November 2010 - 07:20 PM

Perhaps the ohm rating of your cable is too low and it can't handle a completely overloaded signal?
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#4 Edgar Dubrovskiy

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Posted 03 November 2010 - 06:02 PM

Thanks! What would be a normal ohm rating for a bnc?
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#5 Edgar Dubrovskiy

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Posted 03 November 2010 - 07:21 PM

Found it - 50 and 75. 75 for video. BBC uses 50 though...

Edited by Edgar Dubrovskiy, 03 November 2010 - 07:21 PM.

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CineTape

Visual Products

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