Yongnuo Speedlite YN968EX-RT for Cameras - Manual (Page 18)

5.Rear-curtain Sync Flash
You can use slow-speed shutter to produce trailing smear for the object and the
flash light will flash at the moment when the shutter is going to be shut, which
means the rear-curtain sync function (refer to camera’s manual for setting).
You can turn on or off the rear-curtain sync by pressing the function button
[ ] on the speedlite.
Advanced Applications
1.Flash Exposure Compensation (FEC)
In order to make the shooting effect more suitable
to your needs, you can set the flash exposure
compensation through the camera or on the flash.
The exposure compensation value is within the
range of -3EV~+3EV. lt can be set through pressing
the function button
[ ] and rotating the [ ] .
2.Flash Exposure Bracketing (FEB)
The FEB function ca be set through the camera or
speedlite. After the FEB is set, after every 3 photos
are taken, exposure compensation will be made
automatically in the sequence of. for example,
normal->under->over. This function helps you
improve the success rate of photo taking. Please
short press the function button
[ ] a n d [ ]
t o directly adjust the exposure bracketing value.
NOTE: Please note that this compensation setting will overlap the exposure
compensation setting on the camera. When used as the slave unit, the
exposure compensation value set on the slave unit will overlap the exposure
compensation on the master unit.
NOTE: For FEB, set the drive mode of camera to "single shooting", be sure
the flash is ready before shooting.
When the YN968EX-RT is used as wireless flash, the rear-curtain sync
function cannot be set.
3.FE Lock(FEL)
To use this function, cover the subject for which flash exposure will be locked at
the center of the viewfinder of camera, press the button
[*] of the flash exposure
lock, and the flash light will pre-flash and the camera will calculate the
appropriate flash output data. Now you have some time for recomposition,
after it you can take photo. (The function can only be used when it is supported
by your camera. For the setting method please refer to your camera manual.)
4.High-speed Sync Flash
With high-speed sync (FP flash), the YN968EX-RT can be synchronized with all
shutter speeds, it is particularly convenient to use aperture priority to fill flash
portraits, the maximum shutter sync is up to 1/8000. Press the function button
[ ] button to turn on or off the high-speed synchronization function.
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