Olympus IS-1 - Manual (Page 58)

Exposure
Automatic exposure mode
Exposure refers to the amount of the light which
strikes the film and is controlled by a combina-
tion of aperture size and shutter speed. The
correct amount of the light, or correct exposure,
is controlled according to the film speed
(indicated on the film package, such as ISO 100
or ISO 200).
Automatic exposure function automatically sets
the correct exposure. The IS-1 employs two
types of automatic exposure modes: (1)
programmed auto exposure, and (2) aperture-
preferred auto exposure.
With programmed auto exposure, the camera
automatically sets the most suitable combination
of "F" stop and shutter speed for subjects with a
certain brightness. It lets you concentrate on
composing your shot and releasing the shutter
at just the right time.
With aperture-preferred auto, you can select
any "F" stop by yourself, then according to that
aperture, the camera will automatically set the
most appropriate shutter speed. Aperture -
preferred auto allows greater manual control for
more artistic freedom and expression.
Program chart (Standard photography mode)
The chart shown below is a program chart for
35 mm wide and 135 mm telephoto focal lengths.
According to the focal length, the program itself
changes. When the subject is bright, the "F" stop
and shutter speed change simultaneously. When
the subject is darker, the aperture opens fully and
the shutter speed changes to the corresponding
brightness.
In the standard photography mode (refer to
p. 13), if the built-in flash has been popped-up
it will automatically fire in dark situations. The
shutter speed will be fixed at 1/100 second.
Shutter speed (second) —— Flash OFF
– – – Flash Fill-in
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