Olympus C-200 Zoom EN - Manual (Page 158)

Glossary of Terms
148
Aperture
This is a mechanism for adjusting the
amount of light that passes through the
lens. Lower values allow more light to
pass, while higher values lessen the
amount of light.
Backlight
A light source that is behind the
subject.
CCD (Charge-coupled Device)
A pickup element that converts light
passing through the lens into electrical
signals. On this camera, light is picked
up at 2.11 million points and converted
to RGB signals to build a single image.
Contrast Detection Auto-Focus
This is a method used to measure the
distance to the subject. The camera
determines whether the image is
focused by detecting the level of
contrast in the subject.
Conventional Photograph
This refers to the system of recording
images using silver halide. (This is the
method for recording images on film in
conventional, non-digital photography.)
This system is in contrast to still video
and digital photography.
DCF (Design rule for Camera File
system)
A standard formulated for image files
by the Japanese Electronic Industry
Development Association (JEIDA).
Digital ESP (Electro-Selective
Pattern) light metering
A light metering method that
determines the exposure by metering
and calculating the light levels in the
center and around the periphery of the
image separately.
DPOF (Digital Print Order Format)
A format used for recording automatic
print settings for digital cameras. By
recording which images are to be
printed the user can automatically have
the desired images printed by a printer
or print lab that supports the DPOF
format.
Eclipsing (Vignetting)
This refers to the situation where there
is an object that obscures part of the
field of view so that part of the subject
is not photographed. Vignetting also
refers to the situation where the image
seen through the viewfinder does not
exactly match the image shot through
the objective lens so that the
photographed image includes objects
not seen through the viewfinder.
Vignetting can also occur when the
incorrect lens hood is used and
shadowing appears in the corners of
the image.
EV (Exposure Value)
An exposure measurement system in
which the exposure for an aperture of
F1and a shutter speed of 1 second is
taken as EV0. The EV value then
increases by 1 each time the aperture
increases by one F stop or the shutter
speed increases by one increment. EV
can also be used to indicate brightness
and ISO settings.
Exposure
The amount of light used to capture an
image. The exposure is determined by
the time for which the shutter is open
(shutter speed) and the amount of light
that passes through the lens
(aperture).