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Exposure
Programmed exposure
One of the basics of photography is exposure. Exposure
refers to the amount of the light which strikes the film.
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), the shutter
speed and aperture. Many cameras are now equipped
with a programmed exposure function so that the correct
exposure can be obtained easily without any guess-work
or previous photographic experience.
With programmed auto exposure, the camera
automatically sets the most suitable combination of "f "
stop and shutter speed for subjects at any brightness
level. As a result, the correct exposure will be obtained
almost immediately. It's an automatic exposure system
that means you'll never miss the opportunity to take a
photograph. All the photographer has to do when
holding the camera is to concentrate on aiming it
correctly and press the shutter release button. For
example, when you change from a dark to bright subject,
the camera adjusts itself to maintain the correct
exposure. Anyone can take photographs without
worrying about making a mistake.
Now, through the program shift function, it is possible to
change combinations of shutter speed and aperture
without changing the overall exposure.
Program chart
The chart below is a line chart showing the AZ-4 Zoom
exposure program. In response to the use of the macro
mode or zooming, the ideal shutter speed and aperture
will be set automatically for an appropriate brightness in
your photos. As the brightness of your target decreases,
the aperture opening is increased and the shutter speed is
lengthened. In order to avoid the effects of camera
flutter, the shutter speed is automatically set at 1/100 sec.
for pictures taken with the flash auto mode. If the format
is too dark for an appropriate photo, the flash will fire
automatically. In the event that the flash does not pop
up, by using the fill-in flash mode, the shutter speed can
be increased to compensate for brightness at the EV 4
level, and it is possible to increase the shutter speed up to
a 32 sec. exposure by employing the program shift at the
same time.
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