Canon EOS 550D 用户手册

192

Custom Functions are organized into four groups based on the function 
type: C.Fn I: Exposure, C.Fn II: Image, C.Fn III: Autofocus/Drive, C.Fn 
IV: Operation/Others.

3

 Custom Function SettingsN

Sets 1/2-stop increments for the shutter speed, aperture, exposure 
compensation, AEB, flash exposure compensation, etc. Effective when you 
prefer to control the exposure in less fine increments than 1/3-stop increments.

For the ISO speed, “H” (equivalent to ISO 12800) will be selectable. 
However, if [C.Fn-6: Highlight tone priority] is set to [1: Enable], “H” 
cannot be set.

The flash sync speed is set automatically within a range of 1/200 sec. to 
30 sec. to suit the scene’s brightness.

When flash is used with aperture-priority AE (f), this prevents a slow 
flash-sync speed from being set automatically in low-light conditions. It 
is effective for preventing subject blur and camera shake. However, 
while the subject will be properly exposed with the flash, the background 
will come out dark.

The flash-sync speed is fixed to 1/200 sec. This more effectively 
prevents subject blur and camera shake than with setting 1. However, 
the background may come out darker than with setting 1.

The exposure level will be displayed in the viewfinder and on the LCD 
monitor as shown below.

COP

Y