Canon EOS Rebel T4i Instruction Manual - Page 217
Shutter synchronization, 1st curtain, 2nd curtain, Hi-speed, Wireless functions, Flash exposure
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3 Setting the FlashN Shutter synchronization Normally, set this to [1st curtain] so that the flash fires immediately after the exposure starts. If [2nd curtain] is set, the flash will fire right before the shutter closes. When this is combined with a slow shutter speed, you can create a trail of light such as from car headlights at night. With E-TTL II (auto flash exposure), two flashes will be fired: Once when you press the shutter button completely, and once immediately before the exposure ends. Also, with shutter speeds faster than 1/30 sec., 1st curtain synchronization will automatically take effect. If an external Speedlite is attached, you can also select [Hi-speed] (e). For details, refer to the Speedlite's instruction manual. Wireless functions When performing optical transmission wireless flash shooting using the master function of the built-in flash, see "Wireless Flash Photography" on page 225. When performing wireless flash shooting with radio or optical transmission using the master function of the external Speedlite, refer to the Speedlite's instruction manual. Flash exposure compensation See "Flash Exposure Compensation" on page 118. Flash mode You can select the flash mode to suit your desired flash shooting. [E-TTL II] is the standard mode of EX-series Speedlites for automatic flash shooting. [Manual flash] is for advanced users who want to set the [Flash output] (1/1 to 1/128) themselves. Regarding other flash modes, refer to your Speedlite's instruction manual. 217