Nikon SB-27 - Manual (Page 51)

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1
Set the camera's exposure mode to aperture-priority
auto (A) or manual (M).
With bounce flash operation, there is 2 to 3 f/stops less light
available than in normal flash operation. We recommend that
you select wider aperture (lowest possible f-number) and
bracket to ensure correct exposure.
2
Set the SB-27's flash mode selector to "AUTO".
TTL
A
M
M
ZOOM
ISO
mm
f t m
60
30
15
7
4
2
18
9
4
2
1
0.6
3
Check the reflective surface and adjust flash head direction.
NOTE
Choose a reflective surface with a high reflection factor such
as a white wall for bouncing the light off.
In color photography, only use bounce against white reflective
surfaces. Otherwise, color photographs will come out with an
unnatural color cast similar to that of the reflective surface.
Make sure you set the camera setting switch to K with
cameras in Groups I thru VI, and to ˚ with cameras in Group
VII. (Do not select the K setting with cameras in Group VII.)
Procedures for bounce flash operation