Canon powershot s2is Benutzerhandbuch

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Shooting-A
dvanced Functions
6
Setting the Aperture
When you set the aperture in the aperture-priority AE mode, the camera 
automatically selects a shutter speed to match the brightness.
Selecting a lower aperture value (opening the aperture) allows you to blur 
the background and create a beautiful portrait.
A higher aperture value (closing it) brings the entire range from 
foreground to background into focus. The larger the aperture value, the 
greater the range of the image brought into clear focus.
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If the image would be underexposed (too dark) or overexposed (too bright) and 
the correct exposure cannot be obtained, the shutter speed display on the LCD 
monitor (or viewfinder) turns red. Adjust the value with the 
W or X button so that 
the shutter speed display turns white.
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Some aperture values cannot be selected depending on the zoom position.
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In this mode, the maximum shutter speed with synchronized flash is 1/500 
second. The aperture value setting may therefore be changed automatically to 
match the synchronized flash speed even if its value was set previously.
Aperture Setting Display
The larger the aperture value the smaller the lens opening, allowing less 
light to enter the camera.
Manually Setting the Shutter Speed and Aperture
You can manually set the shutter speed and aperture to achieve a 
particular effect. Use this for shooting in special conditions, such as for 
time exposures.
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The brightness of the LCD monitor (or viewfinder) matches the selected 
shutter speed and aperture value. When you select a fast shutter speed or 
f/2.7  f/3.2  f/3.5  f/4.0  f/4.5  f/5.0  f/5.6  f/6.3  f/7.1  f/8.0
Safety Shift
With Tv and Av modes, if [Safety Shift] is turned [On] in the Rec. menu, 
the shutter speed or aperture value is automatically adjusted for the 
correct exposure when it cannot be otherwise obtained. 
Safety Shift is disabled when the flash is enabled.