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5958
APERTURE CONTROL
Large Aperture Small Aperture
S MODE
-
SHUTTER PRIORITY
1. Set the command switch
to ASM.
In S mode, you select the shutter speed and the camera
automatically sets the aperture required for proper exposure.
This mode is useful when you want to control subject blur.
2. Press the command-
mode button until S
appears in the data panel.
3. Turn the control dial to
select the shutter speed.
The size of the aperture (lens opening) determines the depth-
of-field in the final image as well as the intensity of the light
falling on the film. Depth-of-field is the area in front of and
behind the point where the lens is focused which will appear
sharp.
Large apertures (small numbers) limit the depth-of-field to a
narrow range in front of and behind the point of focus. A
narrow depth-of-field is used when you want to place greater
visual emphasis on your main subject by blurring the
background, as in the case of portraits. Small apertures
(large numbers) provide greater depth-of-field, bringing an
increasingly greater range into focus. A large depth-of-field is
important when you are photographing landscapes to ensure
the entire scene will be sharp.
•Usable apertures will depend on the aperture range of the
lens you are using.