Jump to content


Photo

Shutter angle/shutter speed/aperature


  • Please log in to reply
2 replies to this topic

#1 jon lawrence

jon lawrence
  • Basic Members
  • PipPip
  • 82 posts
  • Student

Posted 26 October 2006 - 06:12 PM

Hi, I was curious about the relationship between shutter angle, shutter speed and aperature. I read that shutter speed is used to control the amount of motion blur e.g a small shutter angle would restrict the amount of motion blur which is used to give a stuttered feel. If so, would that mean I'd need a larger aperature to compensate for the loss of light reaching the film? I'm confused to weather shutter speed and shutter angle are, in some respects, the same thing.

Any help would be much appreciated.
  • 0

#2 Bernhard Zitz

Bernhard Zitz
  • Basic Members
  • PipPipPipPip
  • 342 posts
  • Other
  • Z├╝rich, Switzerland

Posted 27 October 2006 - 09:32 AM

The shutter is usually a spinning round plate with a cut-out (exept beaulieus have a guiotine shutter). A normal shutter has a 180 degrees cut-out. This looks like the half of a apple-pie. If you shoot at 25fps you get a shutterspeed of 1/50. If your shutterangle is 90degrees (looks like a apple-pie where 1/4 has been eaten) you get 1/100 shutterspeed at 25fps, ect..

shutterspeed=1/((360/shutterangle) * fps)

since your shutterspeed (eposing-time) changes you have to compensate in f-stops
  • 0

#3 Anthony Schilling

Anthony Schilling
  • Basic Members
  • PipPipPipPip
  • 1053 posts
  • Camera Operator
  • Portland, OR

Posted 27 October 2006 - 12:10 PM

I use a faster shutter a lot for variuus reasons... opening one full stop for a 90 degree shutter, and 2 stops for a 45 degree shutter. It works for me everytime.
  • 0


Tai Audio

rebotnix Technologies

Paralinx LLC

Abel Cine

CineTape

Media Blackout - Custom Cables and AKS

Willys Widgets

Technodolly

Gamma Ray Digital Inc

The Slider

Metropolis Post

Glidecam

Visual Products

Opal

Aerial Filmworks

Broadcast Solutions Inc

Rig Wheels Passport

Wooden Camera

Ritter Battery

CineLab

FJS International, LLC

Abel Cine

Broadcast Solutions Inc

Media Blackout - Custom Cables and AKS

Metropolis Post

Glidecam

rebotnix Technologies

Wooden Camera

Paralinx LLC

Technodolly

Visual Products

The Slider

Gamma Ray Digital Inc

Rig Wheels Passport

Tai Audio

Aerial Filmworks

CineLab

Ritter Battery

CineTape

FJS International, LLC

Opal

Willys Widgets