Jump to content


Photo

frame rate


  • Please log in to reply
1 reply to this topic

#1 Jim Nelson

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

Posted 27 September 2010 - 09:08 PM

Hi,

Can someone please help me out?

Will changing the frame rate have an effect on the exposure? For example, if we go from 24fps to 45fps will we have to change our fstop?



Thanks for your help
  • 0

#2 David Mullen ASC

David Mullen ASC
  • Sustaining Members
  • 20074 posts
  • Cinematographer
  • Los Angeles

Posted 28 September 2010 - 12:30 AM

Yes, of course it affects exposure... if the film or sensor is running twice as fast, it's only being exposed for half as long, though with a digital camera, you have more shutter speed options to compensate for the exposure loss. Ultimately the issue is shutter speed or time. With a 180 degree shutter at 24 fps, the exposure time is 1/48th. With a 180 degree shutter at 48 fps, the exposure time is 1/96th. However it is possible with a digital camera to switch from 24 fps to 48 fps but keep the shutter time at 1/48th for both (basically a 360 degree shutter at 48 fps, i.e. no shutter).
  • 0


FJS International, LLC

Aerial Filmworks

New Pro Video - New and Used Equipment

Paralinx LLC

rebotnix Technologies

Technodolly

Gamma Ray Digital Inc

Willys Widgets

CineLab

Ritter Battery

Media Blackout - Custom Cables and AKS

Glidecam

CineTape

The Slider

Rig Wheels Passport

Wooden Camera

Visual Products

Tai Audio

Metropolis Post

Abel Cine

Broadcast Solutions Inc

CineTape

Broadcast Solutions Inc

Rig Wheels Passport

New Pro Video - New and Used Equipment

Abel Cine

Willys Widgets

FJS International, LLC

The Slider

Aerial Filmworks

Tai Audio

Visual Products

Paralinx LLC

Ritter Battery

rebotnix Technologies

Wooden Camera

Metropolis Post

Media Blackout - Custom Cables and AKS

CineLab

Technodolly

Gamma Ray Digital Inc

Glidecam