Jump to content


Photo

Phase shifting


  • Please log in to reply
2 replies to this topic

#1 Erkan Umut

Erkan Umut
  • Basic Members
  • PipPipPip
  • 215 posts
  • Cinematographer
  • Istanbul

Posted 06 March 2006 - 06:57 PM

What is Phase Shifting when filming video and computer monitors?

How does it assure in cameras with shutter and pulldown mechanism are mechanically coupled? If its by means of specific speed, it will affect the exposure time and the motion in the video picture...?

How does it assure in cameras with shutter and pulldown mechanism are electronically coupled or independent (like in ARRI 435)? If its by means of shutter timing, it will affect the exposure time...?

  • 0

#2 Tim J Durham

Tim J Durham
  • Sustaining Members
  • 742 posts
  • Director
  • East Coast, Baby!

Posted 07 March 2006 - 07:45 AM

What is Phase Shifting when filming video and computer monitors?

How does it assure in cameras with shutter and pulldown mechanism are mechanically coupled? If its by means of specific speed, it will affect the exposure time and the motion in the video picture...?

How does it assure in cameras with shutter and pulldown mechanism are electronically coupled or independent (like in ARRI 435)? If its by means of shutter timing, it will affect the exposure time...?


Nesselsenez,

Not exactly sure what your question is but there is often a feature called "clear scan" on video cams that is basically a fine detail setting for the shutter. If you are in a 50 hertz country shooting 50i, the clear scan will work around 1/50th/s shutter speed in incrememnts of .01. If you are in 60 hertz countries (60i), it works around 1/60th of a second.

I have never had to use it when shooting in 24p so I'm not sure how/if it would work.
  • 0

#3 dpoperator1

dpoperator1
  • Guests

Posted 09 March 2006 - 12:42 AM

When shooting TV monitors or computer crt screens with a film camera, to eliminate the bothersome shutter bar (a horizontal black bar) which would otherwise roll thru the monitor it is necessary to control the camera's speed, with a digital speed control which works in thousand's of a second (such as the CE speed control etc.)so that the black bar is stabile while the camera is running. This is done without film in the camera or without a mag loaded onto the camera. Then the film is loaded the camera is rolled at this speed and the phase button on the speed control is held down until the bar cycles off the screen at which point speed is called then action etc.
  • 0


Aerial Filmworks

Media Blackout - Custom Cables and AKS

Ritter Battery

Glidecam

FJS International, LLC

Broadcast Solutions Inc

Paralinx LLC

CineLab

Technodolly

CineTape

rebotnix Technologies

Wooden Camera

The Slider

New Pro Video - New and Used Equipment

Abel Cine

Gamma Ray Digital Inc

Visual Products

Rig Wheels Passport

Willys Widgets

Metropolis Post

Tai Audio

Metropolis Post

FJS International, LLC

Wooden Camera

Tai Audio

Glidecam

Paralinx LLC

Gamma Ray Digital Inc

rebotnix Technologies

Media Blackout - Custom Cables and AKS

Rig Wheels Passport

Visual Products

Technodolly

Aerial Filmworks

CineLab

Willys Widgets

The Slider

New Pro Video - New and Used Equipment

Broadcast Solutions Inc

CineTape

Ritter Battery

Abel Cine