Canon 550D instruction manual 3Custom Function SettingsN, Fn I Exposure, 192

3Custom Function SettingsN

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.

C.Fn I: Exposure

C.Fn-1 Exposure level increments

0:1/3-stop

1:1/2-stop

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.

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

C.Fn-2 ISO expansion

0:Off

1:On

For the ISO speed, “H” (equivalent to ISO 12800) will be selectable.

C.Fn-3 Flash sync. speed in Av (Aperture-priority AE) mode

0:Auto

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

1:1/200-1/60 sec. auto

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.

2:1/200 sec. (fixed)

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.

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