Sony DSLR-A100 - Manual (Page 34)

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3 Select the aperture value or the shutter speed using the control dial when the shutter speed and
the aperture value are displayed.
• When the shutter speed and the aperture value are displayed, you no longer have to keep pressing the
shutter button.
• When the shutter speed and the aperture value disappear seconds later, the adjusted values also disappear.
• When the flash is pulled up, you cannot select the program shift (even if you turn the control dial, the
program shift is not turned on). When the program shift is turned on, pulling up the flash cancels the
program shift.
You can adjust the amount of light that passes through the lens. If you open the aperture (a
smaller F-number), the amount of light allowed into the lens increases and the in-focus range
becomes narrower. Only the main subject is then in focus. When the aperture is closed (a
larger F-number), the amount of light decreases and the in-focus range becomes wider. The
whole image is sharpened.
The shutter speed is automatically adjusted to obtain correct exposure according to the
brightness of the subject.
Shooting with aperture priority mode P A S M
P
S
shift (The default setting) P
A
shift
Open the aperture Close the aperture
Mode dial
Control dial