Basic Terminology; Iso Speed - Canon EOS-1Ds Instruction Manual

Basic Terminology

AE
Abbreviation for auto exposure. It is an automatic metering and exposure system that sets the
optimum exposure (shutter speed and/or aperture) based on the reading by the built-in
exposure meter.
AF
Abbreviation for auto focus. It enables the camera to focus the subject automatically.
CF (CompactFlash) card
CF card is the small, card-shaped storage media used to record images taken by the EOS-
1Ds.

ISO speed

This indicates the film's sensitivity to light. It is expressed as a number following "ISO" such as
"ISO 200." The higher the number, the higher the sensitivity to light. Digital cameras also use
the same ISO speed standard used by film-based cameras.
JPEG
Abbreviation for Joint Photographic Experts Group. It is an image file format with various
compression levels. The higher the compression rate, the lower the image quality, when the
file is expanded (restored).
RAW
This is an image file format that saves the image as is when captured by the camera. It is
geared for image processing with a personal computer.
The image quality is not affected when the raw image is compressed, saved, or decom-
pressed. By using the dedicated software for image processing, the image can be optimally
enhanced for the specified purpose.
sRGB
Color matching standard jointly developed by Microsoft and Hewlett-Packard. Cameras,
monitors, applications, and printers which comply with this standard are able to reproduce
colors in the same way. (The "s" stands for standard.)
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