Canon 1Ds Instruction Manual - Page 137
C.Fn-14, Auto reduction of daylight sync, C.Fn-15, Shutter curtain synchronization, C.Fn-16, Safety
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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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