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-PHOTOGRAPHIC TECHNIQUES-confinued------
The procedure for bounce flash is as follows
:
1) Choose the bounce surface.
Select the ceiling or wall you want to bounce the flash off
of
;
then tilt and/or rotate the main flash head
so
that it
pOints in that direction. The position of the flash unit, the
bounce angle, and the setting of the zoom head should
be determined
after considering
the
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 the camera to create
a
three-dimensional
effect. For portraits
,
consider how much brightness you
want for the background.
2) Set
the
zoom head.
In
bounce flash photography, a large
amount
of light is
required
,
because the light has to travel
a
longer distance
than in direct flash photography,
and
also the bounce
surface
absorbs a certain amount of
light. Therefore
,
it
is
recommended that the zoom head be
set
at T. The ratio
of diffused illumination (from the bounce
surface)
to
direct illumination (from
the
secondary
flash
head)
is also
an
important
consideration. If
the
bounce surface is too
far away or
is
not very reflective, the
level
of the diffused
illumination
may be almost
the
same as the
direct
illumi-
nation
,
thus effectively cancelling the diffused
lighting
effect. In this
case,
adjust the
angle
of the main flash
head or
shorten
the bounce distance
so
that there is
more difference in illumination
levels.
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
the camera 's exposure compensation dial set in the
+
direction
for TTL
au
tomatic
shooting
or with the lens
opened up one or two f/stops in the regular
(non-TTL)
automatic mode
.
Notes:
1)
In
general,
there
is a
two
or
three
flstop loss in
illumination
because
of
the
absorption
of
light by
the
reflective
surface.
2) Unless
the
surfa
ce of
the
reflector
you
are bouncing
the
light off of
is
white
or
silver,
your
color
photographs will
come out
with
an
unnatural
color
cast
similar to
that of the 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
this, 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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