Nissin i400 TTL Flash for Cameras - Manual (Page 14)

Bounce lighting
When lighting a subject in front of the
wall, an unnecessary sharp shadow
may appear on the wall behind the
subject resulting in a disappointing
picture. Bounce the light off the ceiling
or wall to soften the light on the subject,
and the shadow will fade.
The flash head turns upward to 45° >60° >75° >90°.
Or mixing it upward/ sideways, you can set it in multiple directions as shown.
When the flash head stays at turning or tilting position, the zoom setting
position of i400 is automatically set at the position for a 50mm focal length lens.
The wall or ceiling in this case should be a flat surface and white color is
preferable. Colored ceiling or wall may reflect its color on the subject.
AF assist light emitter
Under a low light condition, or in a dark place, the AF assist light will
automatically emit the beam and illuminate the subject, so that the camera
can easily focus on the subject in darkness. The beam is however not
shown in the picture.
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The flash head pans to both sides left and right in steps of 30° , 60° , 90°, 120°,
150° , 180° or to right 30°, 60°, 90°, 120°, 150°, 180°.