SIGMA DP3 Merrill - Manual (Page 46)

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P PROGRAM AE
To make picture taking easier, the camera will automatically select
an appropriate combination of shutter speed and aperture value,
according to the brightness of the subject.
1
Set the Exposure Mode to the P
position.
(The exposure indicator is illuminated
in green.)
2
Press the shutter button “half-way” to
verify the focus and take the picture.
WARNING !!

When is shown on the color LCD monitor, the camera is set slower
than 1/60. If this mark is displayed, please use the flash (P.80) or a tripod.

If the subject is too bright or dark, both shutter speed and aperture value
indicators will blink and will show the limit values. If you take a picture with
these settings, the picture will be overexposed or underexposed.
PROGRAM SHIFT
You can change the combination of shutter speed and aperture value,
which were automatically selected by the camera. While turning the
Command-Dial, the combination of shutter speed and aperture value
will change within the range of combinations that give the equivalent
exposure.
■
It will be canceled automatically,
after taking the picture.