Kodak DCS300 - Manual (Page 100)

6-10
Exposure Mode
Light reaching the imager is controlled by shutter speed and lens aperture. The proper
combination results in a correct exposure. Shutter speed and lens aperture settings are
based on the ISO setting and the operation of the camera’s exposure control system.
The relationship between aperture and shutter speed is as follows: one change in either the
shutter speed or the aperture either doubles or halves the amount of light transmitted. For
example, a shutter speed of 1/500 second passes half the light of 1/250 second and double
the light of 1/1000 second. An aperture of f/8 passes half the light of f/5.6 and double the
light of f/11. If the correct exposure for a scene is 1/500 at f/8, we can also select 1/250 at
f/11 or 1/1000 at f/5.6 and achieve the same exposure results.
Your camera offers two types of Programmed Auto Exposure modes, Auto-Multi Program
(P) and Vari-Program (Ps). It also offers Shutter-Priority Auto (S), Aperture-Priority Auto
(A), and Manual (M) Exposure modes. The Exposure mode enables you to determine
whether you want the shutter speed and lens aperture set automatically or manually.