User guide

Glossary 239
Glossary
Aperture
This camera setting measures the size of the opening in the lens. It
controls the amount of light that gets into the camera. The aperture
setting is measured in f-stops that follow the format f/number. For
example, f/22.
Aspect Ratio
The relationship of width to height for a given image or graphic.
Keeping or maintaining the aspect ratio refers to the process of
maintaining size relationships when either the width or height of an
image or graphic is changed. In video, the two most common aspect
ratios are 4:3 and 16:9 for Standard definition (SD) and High definition
(HD) Widescreen video formats.
AVI
Audio-Video Interleave is a digital video file format designed
specifically for the Microsoft Windows environment, now commonly
used as storage for several audio and video codecs.
AVCHD
Advanced Video Codec High Definition is a video format that is
designed for camcorder use. It uses a disc structure designed for Blu-
ray Disc / high definition compatibility and can be burned on standard
DVDs.
Blu-ray Disc
Blu-ray Disc is an optical disc format that uses a blue laser for high
definition video recording and playback. Each disc also allows more
information to be burned in 25-GB (single-layer) and 50-GB (dual-
layer) discs, offering more than five times the capacity of standard
DVDs.