SIGMA SD1 - Manual (Page 53)

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CAUTION !!
•
To prevent overheating and protect the built-in flash unit after using continous
shooting with flash, please do not use your flash for a while.
EXPOSURE MODE AND BUILT-IN FLASH
P mode
Depending on the brightness of the subject and focal length of lens, the most
appropriate shutter speed (between 1/30 - 1/180 sec) and aperture value will be
selected. In bright situations, the flash will be “daylight synchronization flash”, and
the camera will calculate the appropriate flash amount for the correct exposure,
of both the subject and background. If the ambient light is too great, resulting in
overexposure, the shutter speed and aperture value displays will blink. If the
subject is too dark, the camera will proceed to take a flash exposure with the
aperture fully open.
A mode
Use this mode if you want to set the desired aperture value. The camera will
select the appropriate shutter speed for the background. The shutter speed will
operate at 1/180 or slower. In bright situation, the camera will work the same as P
mode for daylight synchronization flash and it can obtain a balanced exposure
between the subject and background. If the maximum synchronized shutter
speed is displayed and is blinking, please set the aperture value to a smaller
aperture value (large F-number).
S mode
Use this mode if you want to set a specific shutter speed. The camera will select
the appropriate aperture value for the background. The shutter speed will operate
between 1/180 or slower. The camera will automatically correct the shutter speed
to the highest synchronization speed even if you select a higher shutter speed. If
the subject is too bright, the flash will be set to daylight synchronized. Then you
can obtain a balanced exposure between subject and background. When the
lens smallest aperture (largest F-number) value is blinking, the picture will be
over-exposed.
M mode
This mode enables you to set both flash synchronized speed and aperture value.
If you set a synchronized speed faster than 1/180, the shutter speed will be set
automatically to 1/180. If the exposure meter indicates appropriate number, you
will obtain the correct exposure for the subject and background. If the exposure
meter indicates minus (under), you will obtain the correct exposure for subject,
but the background will be dark. If the exposure meter indicates plus (over), both
the subject and the background may be over-exposed.