Jump to content


Photo

Interesting problem with DV clamshell


  • Please log in to reply
4 replies to this topic

#1 Edgar Dubrovskiy

Edgar Dubrovskiy
  • Basic Members
  • PipPipPipPip
  • 348 posts
  • Cinematographer
  • London

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!
  • 0

#2 Edgar Dubrovskiy

Edgar Dubrovskiy
  • Basic Members
  • PipPipPipPip
  • 348 posts
  • Cinematographer
  • London

Posted 02 November 2010 - 07:51 AM

Any ideas?
  • 0

#3 Chris Keth

Chris Keth
  • Sustaining Members
  • 4427 posts
  • 1st Assistant Camera
  • Los Angeles

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?
  • 0

#4 Edgar Dubrovskiy

Edgar Dubrovskiy
  • Basic Members
  • PipPipPipPip
  • 348 posts
  • Cinematographer
  • London

Posted 03 November 2010 - 06:02 PM

Thanks! What would be a normal ohm rating for a bnc?
  • 0

#5 Edgar Dubrovskiy

Edgar Dubrovskiy
  • Basic Members
  • PipPipPipPip
  • 348 posts
  • Cinematographer
  • London

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.

  • 0


Metropolis Post

Media Blackout - Custom Cables and AKS

Aerial Filmworks

Opal

Visual Products

Wooden Camera

CineTape

The Slider

Ritter Battery

Abel Cine

Gamma Ray Digital Inc

Glidecam

Rig Wheels Passport

Tai Audio

Broadcast Solutions Inc

Willys Widgets

Technodolly

CineLab

FJS International, LLC

rebotnix Technologies

Paralinx LLC

CineTape

Tai Audio

Abel Cine

Technodolly

Rig Wheels Passport

rebotnix Technologies

Glidecam

FJS International, LLC

Paralinx LLC

Broadcast Solutions Inc

CineLab

Aerial Filmworks

Wooden Camera

Willys Widgets

Media Blackout - Custom Cables and AKS

Visual Products

The Slider

Gamma Ray Digital Inc

Ritter Battery

Opal

Metropolis Post