Nissin i400 TTL Flash for Cameras - Manual (Page 15)

Focus the subject.
Pre-flash is fired to pre-set the correct light amount
for the main subject.
Remarks: FEL only works on P, TV, AV, M & A-Dep
mode.
Set the picture frame as you desire and release the
shutter.
(It depends on different type of camera, please check your camera instruction manual.)
(It depends on different type of camera, please check your camera instruction manual.)
When the back ground of the main subject is too bright, the camera’s expo-
sure 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
With Canon cameras: FE lock
Aim the viewfinder center over the main subject and
press [ ] button on the camera (or [ FEL ] button on
some cameras).
Focus the subject.
Set the Fv lock mode at the menu on your
camera.
With Nikon cameras: Fv lock
Aim the viewfinder center over the main subject
and press [ AE-L ] button on the camera (or
[ AF-L ] button on some cameras).
15