REFERENCE
1. Basic information on photography
<Exposure>
Exposure is the act of exposing the film to light, thus converting brightness val- ues in a scene to tonal values on film. Exposure is composed of the size of the opening in the lens (the aperture) and the duration of time in which the light passes through the lens to strike the film (the shutter speed.)
<Shutter speed>
The camera adjusts the amount of light to which the film is exposed by adjusting the length of time in which the shutter is open. The length of time that the shut- ter is open is called the shutter speed.
<Aperture value>
The aperture is an opening in the lens. The amount of light passing through the aperture to the film is adjusted by increasing or decreasing the diameter of the opening. The size of this opening is called the aperture value.
<Film speed or sensitivity (ISO value)>
The film speed indicates the extent to which the film reacts to light, and is expressed as a figure determined by the ISO (International Standardization Organization).
90 | 91 |
