Glossary
Appendixes
154
Exposure
The amount of light allowed to reach the camera’s sensor. Exposure is controlled by
a combination of the shutter speed, the aperture value, and ISO sensitivity.
Flash
A speed light that helps to create adequate exposure in low-light conditions.
Focal length
The distance from the middle of the lens to its focal point (in millimeters). Longer
focal lengths result in narrower angles of view and the subject is magnied. Shorter
focal lengths result in wider angles of view.
H.264/MPEG-4
A high-compression video format established by international standard
organizations ISO-IEC and ITU-T and developed by the Joint Video Team (JVT). This
codec is capable of providing good video quality at low bit rates.
Image sensor
The physical part of a digital camera that contains a photosite for each pixel in
the image. Each photosite records the brightness of the light that strikes it during
an exposure. Common sensor types are CCD (Charge-coupled Device) and CMOS
(Complementary Metal Oxide Semiconductor).
DIS (Digital Image Stabilization)
This feature compensates in real-time for shaking and vibrating while shooting.
There can be a certain amount of image degradation compare to Optical Image
Stabilization.
EV (Exposure Value)
This feature allows you to quickly adjust the exposure value measured by the
camera, in limited increments, to improve the exposure of your photos. Set the EV
compensation to -1.0 EV to adjust the value one step darker and 1.0 EV to one step
brighter.
EV Compensation
All the combinations of the camera’s shutter speed and lens aperture that result in
the same exposure.
Exif (Exchangeable Image File Format)
A specication to dene an image le format for digital cameras created by the
Japan Electronic Industries Development Association (JEIDA).