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Glossary-4 April 29, 2004
Matrix Metering system An advanced exposure metering system using a multi-segment sensor and
computer.
Rear-Curtain Sync Flash fires an instant before the second (rear) curtain of the focal plane
shutter begins to move. When slow shutter speeds are used, this feature can
create a blur effect from the ambient light, i.e., a flowing-light pattern
following a moving subject with subject movement frozen at the end of the
light flow. See also “Front-Curtain Sync.”
Release-Priority for
autofocus
Shutter can be released anytime (i.e., even when subject is not in focus).
Helps you avoid missed opportunities when you are not concerned with
absolute focusing precision.
Single Servo AF Once the subject is in focus, focus is locked. Useful for recomposing the
picture.
Release-Priority is given to Continuous Servo AF mode while Focus-Priority
is given to Single Servo AF. Using Custom Setting, however, you can change
the priority to Focus-Priority Continuous Servo AF or Release-Priority Single
Servo AF.
Slow Sync A flash technique for using the flash at a slow shutter speed. Flash shooting
in dim light or at night at a fast shutter speed often results in a
flash-illuminated subject against a dark background. Using a slower shutter
speed with the flash brings out the background details in the picture. Use of
a slow shutter speed with Rear-Curtain Sync is particularly effective for
illustrating the movement of a stream of light.
Slow Sync mode extends the automatically controlled shutter speed range
(in Programmed Auto and Aperture-Priority Auto) down to 30 seconds.
Vignetting Progressively diminished illumination on the image from the center to the
corners. There are two kinds of vignetting—natural vignetting caused by
the lens, and vignetting that is caused by improper use of accessories such
as a lens hood or filter.
White balance Provides adjustments to match the type of lighting used to capture an image.