Nissin Di700A Flash for Micro Four Thirds Cameras - Manual (Page 21)

Focus the subject.
Pre-flash is fired to pre-set the correct light
amount for the main subject.
Remarks: AEL only works on P, A, S & M
mode.
(It depends on different type of camera, please check you camera
instruction manual.)
When the back ground of the main subject is too bright, the
camera’s exposure reading system adjusts the flash light intensity
for such back ground condition and it results in the main subject
being underexposed. Or in case the main subject is not placed in
the center of the viewfinder, the flash picture may result in the aimed
targeted subject being under or over exposed.
You can lock the correct flash exposure for the targeted subject in
such a condition. This flash exposure pre-set remains locked in,
even if you change the aperture or zoom the lens in and out. This
mode can only be set on the camera.
Flash Power Lock
Flash Exposure Level Lock AEL Lock
Aim the viewfinder center over the main
subject and press [ AEL ] button on some
cameras.
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