Canon 1Ds Instruction Manual - Page 137

C.Fn-14, Auto reduction of daylight sync, C.Fn-15, Shutter curtain synchronization, C.Fn-16, Safety

Page 137 highlights

MENU Custom Function Settings C.Fn-14 Auto reduction of daylight sync 0: Obtains a natural-looking fill-flash automatically. 1: This prevents underexposure of a subject in front of a strong backlight such as a sunset. C.Fn-15 C.Fn-16 C.Fn-17 Shutter curtain synchronization 1: By using a slow sync speed, you can create a light trail following a moving subject. The flash fires right before the shutter closes. This Custom Function can be used to obtain 2nd-curtain sync effects even with EX-series Speedlites which do not have this capability. If an EX-series Speedlite having this capability is set for 2nd-curtain sync, it will override this Custom Function. Safety shift in Av or Tv Safety shift can be set for the shutter-priority AE and aperturepriority AE modes. 1: If the subject's brightness changes suddenly and the current shutter-priority AE or aperture-priority AE setting becomes unsuitable, the shutter speed or aperture is shifted to obtain a suitable exposure automatically. AF point activation area 1: The AF point activation area expands by one point all around the manually-selected AF point. A total of 7 AF points become active. This setting is effective for when only one manually-selected AF point is unable to focus track a subject moving erratically. 2: The camera automatically sets the AF point activation area 8 to 7 or 13 points to suit the lens focal length, AF mode, and the subject's speed during predictive AF. This is effective when the subject's movement is unpredictable. • The AF point activation area centers on the selected AF point. Therefore, if a peripheral AF point is selected, the AF point activation area will be smaller as shown below. 7-point activation area 13-point activation area Selected AF point Activation area • Setting C.Fn-13 together will also expand the AF point activation area. 137 Menu Settings

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137
Menu Settings
8
Custom Function Settings
MENU
C.Fn-14
Auto reduction of daylight sync
0: Obtains a natural-looking fill-flash automatically.
1: This prevents underexposure of a subject in front of a strong
backlight such as a sunset.
C.Fn-15
Shutter curtain synchronization
1: By using a slow sync speed, you can create a light trail
following a moving subject. The flash fires right before the
shutter closes. This Custom Function can be used to obtain
2nd-curtain sync effects even with EX-series Speedlites
which do not have this capability. If an EX-series Speedlite
having this capability is set for 2nd-curtain sync, it will
override this Custom Function.
C.Fn-16
Safety shift in Av or Tv
Safety shift can be set for the shutter-priority AE and aperture-
priority AE modes.
1: If the subject’s brightness changes suddenly and the current
shutter-priority AE or aperture-priority AE setting becomes
unsuitable, the shutter speed or aperture is shifted to obtain
a suitable exposure automatically.
C.Fn-17
AF point activation area
1: The AF point activation area expands by one point all around
the manually-selected AF point. A total of 7 AF points
become active. This setting is effective for when only one
manually-selected AF point is unable to focus track a subject
moving erratically.
2: The camera automatically sets the AF point activation area
to 7 or 13 points to suit the lens focal length, AF mode, and
the subject’s speed during predictive AF. This is effective
when the subject’s movement is unpredictable.
The AF point activation area centers on the selected AF
point. Therefore, if a peripheral AF point is selected, the
AF point activation area will be smaller as shown below.
Setting C.Fn-13 together will also expand the AF point
activation area.
7-point
activation area
13-point
activation area
Selected AF point
Activation area