Canon 4587A023 Instruction Manual - Page 86
C.Fn-05 Mirror lockup, C.Fn-06, Shutter curtain sync with built-in flash/EOS-dedicated Speedlite
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Custom Function Settings C.Fn-05 Mirror lockup 0 : Disabled (Normal operation) 1 : Enabled Effective for close-up and telephoto shots to prevent camera shake caused by the mirror's reflex action. See page 75 to use this feature. C.Fn-06 Shutter curtain sync with built-in flash/EOS-dedicated Speedlite 0 : 1st-curtain sync 1 : 2nd-curtain sync With second-curtain sync and a slow shutter speed, you can create a light trail following a moving subject. The flash fires right before the shutter closes. Second-curtain sync can be set even with EOS-dedicated Speedlites which cannot switch the shutter curtain synchronization. The Speedlite with a shutter curtain synchronization setting will override the camera's setting. C.Fn-07 AF-assist beam emission / Main flash firing The AF-assist beam from the camera and the EOS-dedicated Speedlite can be enabled/disabled, and the flash from the camera and EOS-dedicated Speedlite can be enabled/disabled. 0 : Enable AF-assist and flash 1 : Disable AF-assist and enable flash 2 : Enable AF-assist only with EOS Speedlite and enable flash 3 : Enable AF-assist and disable flash 86