-PHOTOGRAPHIC
TECHNIQUES-confinued-----
----I
The procedure for bounce
fla
sh
is
as
follows :
1) Choose the bounce surface.
Select the ceiling or wa
ll
you want to bounce the flash off
of; then
ti
lt
and/or rotate the main flash head
so
that
it
poin
ts
in
that direction. T
he
position of the flash
un
it, the
bounce angl
e,
and the setting of the zoom head should
be
determined after considering
th
e size and shape of
the subject and the effect desired. With a subject having
great depth, some light should reach the point furthest
away from
th
e camera to create a three·dimen
si
onal
effect. For portraits, consider how much brightness
you
want for the background.
2) Set the zoom head.
In bounce flash
ph
otography, a large amount of light is
required, becau
se
the light
ha
s to travel a longer
di
stance
than in direct
fla
sh
photography, a
nd
al
so the bounce
surface absorbs a certain amount of light.
Th
erefore,
it
is
recommended that the zoom head
be
set
at
T.
Th
e ratio
of diffused illumination (from the bounce
su
rface) to
direct i
ll
umination (trom the secondary flash head) is al
so
an
important consideration.
If
the bounce
su
rface
is
too
far away or is
no
t very reflecti
ve,
the level of the diffu
se
d
illuminati
on
may
be
al
most
th
e same
as
the direct illumi·
nation, thus effectively cancelling the diffu
se
d lighting
effect.
In
this cas
e,
adjust the angle of the main
fla
sh
head or shorten the bounce distance
so
that there is
more difference
in
illumination
le
vel
s.
56
3) Choose an aperture.
Test
firing the flash
is
necessary, because exposure
in
bounce flash photography depends
on
so
many condi·
tions, such
as
reflectivity of the bounce surface and the
bounce distance. Note that,
in
bounce flash , shooting
distance cannot
be
read with the exposure calculator dial.
4)
Bracket your exposures.
It
is
recommended that
you
take additional shots, with
th
e camera's exposure compensation dial set
in
the +
direction for TTL automatic shooting or with the lens
opened
up
one or two f/stops
in
the regular (non·TTL)
automatic mode.
Noles:
1)
In
general, there
is
a two or three f!stop loss
in
illumination because
of
the absorption of light by the reflective surface.
2)
Unless the surface
of
the reflector
you
are bouncing the light
off
of
is
white or silver, your color photographs will come out wi
th
an unnatural
color cast similar to that
of
t
he
reflecting surface.
3)
When the flash head
is
tilted back 45°
or
less, some amount
of
light
from the flash head may reach the subject directly, causing uneveness
of
illumination.
To
avoid thi
s,
make sure
the
head
is
tilted back
60°
or more.
4)
In
bounce flash, the angle
of
incidence
is
equal to the angle
of
re-
flection.
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