Canon EOS Rebel T6i EF-S 18-55mm IS STM Lens Kit Instruction Manual - Page 177
Shutter synchronization, 1st curtain
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3 Setting the FlashK Flash mode When using an external Speedlite, 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 the instruction manual of a Speedlite compatible with the functions. 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 a more natural feel. 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, if the shutter speed is 1/30 sec. or faster, firstcurtain synchronization will be applied automatically. If an external Speedlite is attached, you can also select [High-speed synchronization] (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 "Using Wireless Flash" on page 179. 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 168. 177