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Clitch in video signal.


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#1 Tobias Andersson

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Posted 05 May 2010 - 02:46 PM

I had an "interresting" situation on a 35mm student filmshoot.

I was the 1st AC, we were using the Arriflex BL Evolution camera with an Denz external video-assistant. We had a dolly shot on steel tracks with an really old-school dolly.

The shot was a tracking shot to stage left, but just at the end of the shot the video signal (kinda) blacked out - and then came back - got all fuzzy for a moment then restored the original quality.

The director and cinematographer were worried that the clitch was in the camera. I was right next to the camera and didnt hear or feel anything out of the ordinary. Neither did the DP see anything strange in the viewfinder.

We came to the conclusion that the clitch PROPABLY came when the dolly wheel was going over to another track where the black coating on the steel tracks had worn off abit. Our grip speculated that it propably had something to do with that.

This was the first day of our 5 day shoot - but because of the building days in between we only shoot one day per week.

The film went to the lab, and I checked with them that the negative was ok and EV where it should.

But I've never experienced this before. Been working around 4 years as AC.

If this sounds familiar to anybody - please let me know so I can sleep alittle better at nights....

Thanks!
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#2 Saul Rodgar

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Posted 05 May 2010 - 04:53 PM

The film went to the lab, and I checked with them that the negative was ok and EV where it should.


The video assist and the film systems on film cameras are completely independent and one system being out of order does not affect the other, except for lens, power or prism issues within the camera of course. So no surprise your negative was fine.
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#3 John Sprung

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Posted 05 May 2010 - 05:38 PM

The most probable cause is a bad cable or connector if you're hard wired. Give the cables a shake and see if it happens again. If you're going RF, then you should be surprised when you don't get glitches.





-- J.S.
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