Nikon SB-27 - Manual (Page 49)

Bounce flash operation
(For cameras in all groups)
49
Direct flash causes harsh, unattractive shadows to appear
on the faces of subjects in front of a wall. By bouncing the
light off the ceiling or walls, you can soften the shadows and
produce more natural portraits.
The flash head rotates from the horizontal to the vertical position
along a 180° arc.
Normal flash shooting using
direct flash
Bounce flash shooting using
diffused light
Vertically bounced light
The SB-27 comes with a built-in diffuser card, useful for
highlighting a subject's eyes during bounce flash operation.
(See page 53.)
Built-in diffuser card