Exposure Control

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					Exposure Control
Definition

o The Amount of light allowed to fall on the
  film / sensor. *
CONTROLLED BY MANY
THINGS
oAperture
oShutter
oFilm speed – ISO *
Aperture Settings

oControls the intensity
 of the light entering
 the camera. *
Aperture control
o Aperture is a circular opening.
o It’s opening controls the amount of
  light that can pass through the lens
o A large aperture (opening) will admit
  more light than a small aperture. *
 Aperture Size
o Specified by f-stops
o “f” stand for FRACTION
o The larger the f-number the
  smaller the aperture opening.
o For example: f/8 (1/8) aperture is
  smaller than an f/4 (1/4) aperture.
  *
Shutter speed

o Controls the length of time the light is
  allowed to enter the camera. *
Shutter

o Device something like a window blind. *
Shutter speeds

o A number that represents fractions of a
  second that the shutter remains open.
o For example:
  n   “1” = 1/1 or one second
  n   1/15 = one fifteenth of a second
  n   1/125 – and continues
o 1/30 second or faster are needed when
  the camera is hand-held to avoid blurring
  from camera movement. *
Film Speed

o A measure of a film’s / sensors
  sensitivity to light. *
Settings

o Fast speeds (1600) is very light
  sensitive, chosen in dimly lite situations.
o Slow speeds (100) needs much more
  light to produce a good image. *
ISO Values

o Film/Sensor speed in measured in ISO
  rating.
o ISO – International Standards
  Organization.
o The Higher the ISO, the faster the
  speed, the less light is needed.
o Quality is lost (grainy) as ISO speeds
  increase. *

				
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posted:7/24/2013
language:English
pages:12