Pentax ZX-L ZX-L Manual - Page 91

Guide, follows, depending, speed., f/2.8, aperture, calculate, effective, flash, range, follows,

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USING II-It ESUILI-IN I-LASH I The Guide No. will be as follows depending on the ISO film speed. ISO Film Speed Guide No. ISO25 5.5 ISO50 7.8 ISO100 11 ISO200 15.6 ISO400 22 With ISO 100 film and an f/2.8 aperture, calculate the effective flash range as follows: For far distances Guide No. 11 f/2.8 = approx. 3.9 m For near distances 3.9÷5 = approx. 0.8 The effective flash range is therefore approx. 0.9 m - 4.3 m. Calculating the flash aperture from the effective flash range Use the effective flash range to calculate the flash aperture as follows: Guide No. ÷ flash range = Flash aperture If the result is a number (such as 3) that is not a lens aperture value, set it to the next smaller aperture value (2.8). AHdVEID010Hd HSV1

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USING
II
-
It
ESUILI-IN
I
-
LASH
I
The
Guide
No.
will
be
as
follows
depending
on
the
ISO
film
speed.
ISO
Film
Speed
Guide
No.
ISO25
5.5
ISO50
7.8
ISO100
11
ISO200
15.6
ISO400
22
With
ISO
100
film
and
an
f/2.8
aperture,
calculate
the
effective
flash
range
as
follows:
For
far
distances
Guide
No.
11
f/2.8
=
approx.
3.9
m
For
near
distances
3.9÷5
=
approx.
0.8
The
effective
flash
range
is
therefore
approx.
0.9
m
-
4.3
m.
Calculating
the
flash
aperture
from
the
effective
flash
range
Use
the
effective
flash
range
to
calculate
the
flash
aperture
as
follows:
Guide
No.
÷
flash
range
=
Flash
aperture
If
the
result
is
a
number
(such
as
3)
that
is
not
a
lens
aperture
value,
set
it
to
the
next
smaller
aperture
value
(2.8).
AHdVEID010Hd
HSV1