Pentax SF-10 SF-10 Manual - Page 32

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(2) Using a manual aperture setting: (Please read this section after you finish reading the "OPERATION OF MAJOR FUNCTIONS" section.) When you wish to increase the depth of field, you can manually select a desired aperture. In order to select an aperture manually, the camera must be set in the Aperture-Priority AE mode (see page 38) or the Metered Manual mode (see page 40). Flash recommendation signals Poor lighting Backlighting Aperture-Priority AE O O Metered Manual X O To calculate the effective RTF range with the selected aperture, the following formula can be used: • Maximum distance: (G.N.) ÷ (aperture) • Minimum distance: (Maximum distance) 5 (This formula cannot be used for a subject closer than 0.7 meters.) • 28 If the subject distance is known beforehand, calculate the aperture based on that distance. • (G.N.) (distance) = (aperture) * If the aperture calculated by this formula does not correspond to any f-number found on the aperture ring (for example, the aperture "3," which is between "4" and "2.8"), set the aperture to the smaller f-number ("2.8"). The RTF's guide number (G.N.) varies according to the ISO speed of the film in use, as indicated in the chart below. ISO film speed ISO 25 ISO 50 ISO 100 ISO 200 ISO 400 Guide number G.N. 6 G.N. 8.5 G.N. 12 G.N. 17 G.N. 24 To use the RTF at aperture f/4 with ISO 100 film: 1. Set the lens aperture ring to f/4. 2. Calculate an effective flash range. 12 (G.N.) ÷ 4 (aperture) = 3m (maximum distance) 3m (distance) ÷ 5 = 0.6m (minimum distance 0.7 (actual minimum distance)

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(2)
Using
a
manual
aperture
setting:
(Please
read
this
section
after
you
finish
reading
the
"OPERATION
OF
MAJOR
FUNCTIONS"
section.)
When
you
wish
to
increase
the
depth
of
field,
you
can
manually
select
a
desired
aperture.
In
order
to
select
an
aperture
manually,
the
camera
must
be
set
in
the
Aperture
-Priority
AE
mode
(see
page
38)
or
the
Metered
Manual
mode
(see
page
40).
Flash
recommendation
signals
Poor
lighting
Backlighting
Aperture
-Priority
AE
O
O
Metered
Manual
X
O
To
calculate
the
effective
RTF
range
with
the
selected
aperture,
the
following
formula
can
be
used:
•
Maximum
distance:
(G.N.)
÷
(aperture)
•
Minimum
distance:
(Maximum
distance)
5
(This
formula
cannot
be
used
for
a
subject
closer
than
0.7
meters.)
If
the
subject
distance
is
known
beforehand,
calculate
the
aperture
based
on
that
distance.
•
(G.N.)
(distance)
=
(aperture)
*
If
the
aperture
calculated
by
this
formula
does
not
correspond
to
any
f-number
found
on
the
aperture
ring
(for
example,
the
aperture
"3,"
which
is
between
"4"
and
"2.8"),
set
the
aperture
to
the
smaller
f-number
("2.8").
The
RTF's
guide
number
(G.N.)
varies
according
to
the
ISO
speed
of
the
film
in
use,
as
indicated
in
the
chart
below.
ISO
film
speed
Guide
number
ISO
25
G.N.
6
ISO
50
G.N.
8.5
ISO
100
G.N.
12
ISO
200
G.N.
17
ISO
400
G.N.
24
To
use
the
RTF
at
aperture
f/4
with
ISO
100
film:
1.
Set
the
lens
aperture
ring
to
f/4.
2.
Calculate
an
effective
flash
range.
12
(G.N.)
÷
4
(aperture)
=
3m
(maximum
distance)
3m
(distance)
÷
5
=
0.6m
(minimum
distance
0.7
(actual
minimum
distance)
•
28