Instruction manual

camera
JequipmentY
accessories
T
buyer's
guide
ron.
'ortable
light,
wheneveTand
wherever
you
need
it
Photos
and
text
by
Jack
and Sue
Drafahl
E
lectronic
flash
is
such
an
important part
of
photography
today that
most
consumer cameras, both traditional
and
digital,
have
a
built-in electronic
flash.
When these little
units
can't
do an
adequate job, then
a
separate portable
flash
unit
is a
valuable accessory.
There
are
dozens
of
advantages
to
using
an
electronic
flash,
besides
its
creative options. Flash allows
you to use
slower
films,
since
you
don't
have
to
depend
on
ambient
light
for
exposure.
Your
images
are
sharper because
the
duration
of
most
flash
units
is
Xooo
second
or
shorter.
Electronic
flash is
balanced
to
sunlight,
so it
works well with
daylight-balanced color
films.
Because
the
burst
of
light
is
brief,
strobes allow
you to
capture
the
fast
action
of
moving
subjects.
You can
bounce
the flash to
provide
a
natural
soft
lighting
for
portraits. Flash
is
ideal
for
extreme macro work
because
at
such close range,
it
allows shooting
at
small
apertures
for
optimum depth
of field.
Electronic
flash
provides
the
tools
to
enhance your photography
by
controlling
the
light,
both
indoors
and
out.
Dedicated
Flash
Units
Unlike
automatic
flash
units that
are
controlled
by the
light-sensitive
cell
on the
front
of the flash,
dedicated
flash
units
operate
via
sensors inside
the
camera.
These
dedicated
flashes
have very complex electronics
featuring
dozens
of
functions,
enabling
the flash to do
just about anything
you
want
it to do.
They
control
the
exposure,
so you
don't
have
to
do
much more than turn
the flash
unit
on and
begin
shooting.
When
you
place
a flash on the
hot-shoe
of a
newer
35mm camera,
the flash and
camera communicate with each
other.
The
camera
tells
the flash the
speed
of the film and the
focal
length
of the
lens
you are
using,
and
sets
the
shutter
speed
for
proper sync.
The
camera then selects
the
appropriate aperture
to
provide
a
correct exposure based
on
the
amount
of
light
available.
All
this team
effort
happens
in
just
a
micro second
to
make your pictures
look
good.
Flash units manufactured
for a
specific camera system
are
considered dedicated because each camera system
has a
different
electronic system
for
operating
the
shutter,
measuring
light,
and firing the flash.
This
complex
set of
signals
must
be the
same
for
both
the
camera
and flash to
work
effectively.
There
are
third-party
flash
manufacturers
that also make
flash
units dedicated
to a
specific camera.
The
difference
is
that they must also have
a
module that
fits
between
the flash and the
camera
hot-shoe.
Thanks
to
good
camera
and flash
communication, your
work
is
easier.
The flash
adjusts itself automatically when
the
flash-to-subject
distance
is
changed
so you
don't have
to
spend time
adjusting
the
aperture.
If you
change
to a new
lens
focal
length,
the flash
will
know
and
automatically
adjust
the
angle
of
coverage
in the
zoom head.
Flash-fill
situations
are a
piece
of
cake too,
as the
camera
and flash
know
how
much sunlight
is
available
in the
scene,
and
just
how
much
flash to add to
achieve
the
right
fill
combination.
You
can
also manually override
the flash
ratio using
the
+1-
controls.
If you
stop taking pictures
to
talk
to
someone,
the
flash
will
go
into
a
standby
mode
until
you are
ready
to
shoot again. Most
of the flash
units
will
even
tell
you
with
blinking lights when
you
have taken
a
picture that
is
over-
or
underexposed.
Guide
Numbers
Guide numbers provide
two
handy functions. First, they
give
you an
easy
way to
compare
the
power
of two or
more
flash
units
(just
make sure
all
guide numbers being
compared
are for the
same
film
speed
and the
same angle
of
coverage).
The
guide number also provides
an
easy
method
of
determining
the
proper f-stop
to use for a
manually
exposed
flash
photo:
Just divide
the flash-to-
subject
distance into
the
guide number,
and the
result
is
the
f-stop
to
use.
For
example, let's
say
that your
flash has
a
guide number
of
110
for the film
speed you're using.
If
you are 10
feet
away,
you
divide
the
distance into
the
guide number,
and you get
f/11.
If you are
uncomfortable
with
guide numbers
or
don't know what
it is for
your
flash
(it
should
be in the
instruction manual,
or on the
manufacturer's
website),
not to
worry.
You can
also
use the
bar
chart
or the LCD
panel
on the
back
of the flash to
compute your exposure.
56
2002
PHorographic
Buyer's
Guide

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