Jump to content


Photo

shutter speed


  • Please log in to reply
2 replies to this topic

#1 Jim Nelson

Jim Nelson
  • Basic Members
  • PipPipPip
  • 166 posts
  • Student

Posted 18 August 2010 - 07:05 PM

Hi,

I heard somewhere, that in film you don't have shutter speed, you can only adjust the shutter angle. Wherease in digital, you can only adjust the shutter speed and not the angle. Is this true?
  • 0

#2 David Mullen ASC

David Mullen ASC
  • Sustaining Members
  • 19759 posts
  • Cinematographer
  • Los Angeles

Posted 18 August 2010 - 10:35 PM

Hi,

I heard somewhere, that in film you don't have shutter speed, you can only adjust the shutter angle. Wherease in digital, you can only adjust the shutter speed and not the angle. Is this true?


No, you always have a shutter speed (TIME) -- the length of the exposure per frame -- it's just that on a film camera, shutter time is controlled by the shutter angle + the frame rate. The shutter is a spinning disk with a portion removed to allow the frame to be exposed part of the time, so if the shutter angle is 180 degrees, i.e. a half-circle, then the gate is closed 50% of the time since 180 degrees is half of 360 degrees. So at 24 frames per second, with the film in the gate for 1/24th of a second, it is being exposed for half that time, 1/48th of a second. So that's the shutter speed, i.e. shutter time, exposure time, etc.

Digital cameras generally don't have a film-style rotating mechanical shutter, you just set the time you want the sensor to collect a charge and transfer it, though some cameras like the Red One allow you to set a "shutter angle" instead of a time for those that like to do that. The advantage of setting a fake "shutter angle" figure in the digital camera is that the exposure time automatically changes when you change frame rates.
  • 0

#3 Jim Nelson

Jim Nelson
  • Basic Members
  • PipPipPip
  • 166 posts
  • Student

Posted 19 August 2010 - 06:28 AM

Thank you very much for your help :)
  • 0


Aerial Filmworks

Opal

FJS International, LLC

Visual Products

Tai Audio

CineLab

Gamma Ray Digital Inc

Technodolly

The Slider

Willys Widgets

Glidecam

Media Blackout - Custom Cables and AKS

Paralinx LLC

Wooden Camera

CineTape

Broadcast Solutions Inc

Abel Cine

rebotnix Technologies

Rig Wheels Passport

Ritter Battery

Metropolis Post

Media Blackout - Custom Cables and AKS

Wooden Camera

Rig Wheels Passport

CineTape

FJS International, LLC

Broadcast Solutions Inc

Paralinx LLC

Willys Widgets

Gamma Ray Digital Inc

Glidecam

Metropolis Post

Visual Products

Opal

Abel Cine

The Slider

Aerial Filmworks

Tai Audio

Ritter Battery

CineLab

Technodolly

rebotnix Technologies