Pentax PZ-10 PZ-10 Manual - Page 49

SNO113NIU1VN011100V

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i2? Using the Flash in the Metered Manual mode To determine the flash range for the subject you are photographing, set the lens to the manual lens apertures and apply the following formulas. ** GN = Guide Number Maximum flash distance = GN ÷ Aperture you selected Minimum flash distance = Maximum flash distance ÷ 5 If you already know the focus distance, use the following formula to determine the aperture. GN/Focus distance = aperture If the calculated aperture number doesn't exist on your lens aperture ring, use the next smallest aperture number. The table below shows the equivalent guide number for various film speed. ISO film speed ISO 25 ISO 50 ISO 100 ISO 200 ISO 400 Guide number GN 6 GN 8.5 GN 12 GN 17 GN 24 The following is an example using ISO100 film and a f/3.5 aperture setting. 1. Calculate the distance of the flash. GN12 f/3.5 = 3.4m 3.4 ÷ 5 = 0.68m 2. In this example, you can take a picture using the flash at a distance ranging from 0.7m to 3.4m. Note: When shooting an object that is close and another that is further away in the same picture, setting the aperture for the object that is further away causes the closer object to be overexposed. SNO113NIU1VN011100V 45

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i2?
Using
the
Flash
in
the
Metered
Manual
mode
The
following
is
an
example
using
ISO100
film
and
a
f/3.5
aperture
setting.
To
determine
the
flash
range
for
the
subject
you
are
photogra-
phing,
set
the
lens
to
the
manual
lens
apertures
and
apply
the
following
formulas.
**
GN
=
Guide
Number
Maximum
flash
distance
=
GN
÷
Aperture
you
selected
Minimum
flash
distance
=
Maximum
flash
distance
÷
5
If
you
already
know
the
focus
distance,
use
the
following
formula
to
determine
the
aperture.
GN/Focus
distance
=
aperture
If
the
calculated
aperture
number
doesn't
exist
on
your
lens
aperture
ring,
use
the
next
smallest
aperture
number.
The
table
below
shows
the
equivalent
guide
number
for
various
film
speed.
ISO
film
speed
Guide
number
ISO
25
GN
6
ISO
50
GN
8.5
ISO
100
GN
12
ISO
200
GN
17
ISO
400
GN
24
1.
Calculate
the
distance
of
the
flash.
GN12
f/3.5
=
3.4m
3.4
÷
5
=
0.68m
2.
In
this
example,
you
can
take
a
picture
using
the
flash
at
a
distance
ranging
from
0.7m
to
3.4m.
Note:
When
shooting
an
object
that
is
close
and
another
that
is
further
away
in
the
same
picture,
setting
the
aperture
for
the
object
that
is
further
away
causes
the
closer
object
to
be
overexposed.
SNO113NIU1VN011100V
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