Olympus IS-1 - Manual (Page 59)

Program chart (portrait mode)
The chart shown below is a program chart for
portrait mode.
The shutter speed will automatically adjust up
to 172000 second with the aperture fully opened.
As the brightness increases from there, the aperture
will begin to adjust. The reasoning behind this is
that with a larger (more open) aperture, the depth
of field is reduced. That means that the distanced
background will be more out-of-focus. At the
same time, shutter speed is increased to prevent
camera blur.
Shutter speed (second) ——Flash OFF
– – – Flash Fill-in
Night scene mode
When shooting night scenes you may sometimes
be disappointed with the result. That is usually
because the camera's automatic exposure function
works on a standard exposure ratio. In such situa-
tions a professional photographer will adjust for
exposure compensation or select manual shooting
mode. The exposure compensation level chosen by
a professional is usually based on experience.
The night scene mode of the IS -1 will
automatically adjust exposure compensation for
suitable night scene photography. For example,
when shooting a subject with a night scene as its
background, the use of flash is often desireable.
Should that be the case, the camera performs the
most suitable exposure compensations for both
the subject and the background. The shutter
speed may be very slow (up to 4 seconds with
ISO 100/15 seconds with ISO 25). To prevent
blurring, the camera should be set firmly in
position (with a tripod for example).
Fill-in flash
Under strongly backlit conditions the exposure
may result in a subject that is too dark. The
IS -1 prevents this unwanted result through ESP
photometry and spot metering. However, should
backlighting be extreme, this is not always
effective enough to compensate. For that, the
IS-1 employs a Fill-in flash whereby the subject
is lighted by a flash emission. This lights your
subject, while maintaining proper exposure for
the background. Fill-in flash provides an
iueresting "catchlight" effect where the color of
your subjects eyes appear vivid and aglow.
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