Canon EOS 5D Mark IV Gebrauchsanleitung

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 Custom Function SettingsN
Safety shift
C.Fn1
OFF: Disable
Tv/Av: Shutter speed/Aperture
Takes effect in the <s> shutter-priority AE and <f> aperture-
priority AE modes. If the subject brightness changes and the 
standard exposure cannot be obtained within the autoexposure 
range, the camera will automatically change the manually-selected 
setting to obtain the standard exposure.
ISO: ISO speed
Works in the <d> Program AE, <s> shutter-priority AE, and 
<f> aperture-priority AE modes. If the subject brightness 
changes and the standard exposure cannot be obtained within the 
autoexposure range, the camera will automatically change the 
manually set ISO speed to obtain the standard exposure.
 
When [ISO speed] is set, safety shift will also work with AEB shooting in 
the <a> mode.
 
Under [z2: ISO speed settings], even if [Range for stills] or [Min. 
shutter spd.
] is changed from the default setting, safety shift will 
override it if the standard exposure cannot be obtained.
 
The minimum and maximum ISO speeds of the safety shift using the ISO 
speed will be determined by the [Auto range] setting (p.181). However, if 
the manually set ISO speed exceeds the [Auto range], the safety shift 
will take effect up or down to the manually set ISO speed.
 
Safety shift will take effect if necessary even when flash is used.