Publicité
1. Measu ri ng the Light
that
W ill Actually R each the
Film
Th
e exposure
meter
of
the FUJ ICA ST701 measures
the
light th
at
has passed through the lens
and
will
actually
reach
the
film
as
illustrated
on
page
46.
Exposure is always exact
because the meter is
coupled
directly
with
the
shutter speed and
dia·
phragm.
2.
The Silicon Photocell Light Receptors are Cou·
pled
with
an
FET (Field Effect Transistor)
Circuitry.
Th
e Silicon
photocell light
receptors of
this
camera
are located o
n
both
sides of
the
viewfinder eyepiece
in
order
to measure the
average
brightness
of
the
light that falls
on
the
entire surface of the focusing
glass.
The Silicon photocell units
are coup led with an
FET
circui
try
to
assure h igh
sensitivity,
in
stantane·
ous
response
and precise
measurement
of
all
types
o
f
light
in
o
rd
er
to
yield cons
ist
ently
perfect
pictures.
3.
The Light that Passes Through the Selected
Aperture
is
the Light that is Measured.
The
exposure
meter
of
the FUJICA ST701 measures
the light that has
passed through the
selected
aper·
ture. Theoret
icall
y,
the
light
quantity
at f/8 1/250
sec. is the same as when the settings
are f/5.6
1/500
sec., but precisely
speaking
the quantity would
differ
somewhat
depending
on
the
characteristics of
the
lens. By measuring the light that has
actually
passed through
th
e aperture,
which has been
selected
for making the
exposure,
all
such differences are
-
47·
cancelled out.
I
n addition. this system
of
light
measurement is
compatible with any
lens
as
long
as
the mounting is the same.
I
t
also enables
you to
check
th
e
depth
of
fie ld for
th
e apertu re
you have
selected
As
the Meter
Bu tton
is released, the
diaphragm returns
to
fully
open
again, to
enable you
to
check the
focus
once
more if desired.
4
.
Shooting Close·ups is Easy
No
exposure co rrection is
necessary for shooting
close-ups. or
with
a
filter on you
r
lens.
All
the
complicated
exposure computat ions
required
by
other
types
of cameras
has been
entirely
eliminated
because the meter measures only the light that has
passed through the lens
and
will
actually reach
the
film.
5.
Wide Measuring Range
Since
the
light
t
hat
is
measured
is
the average light
intensity
falling on the focusing glass. the range of
measurement must differ depend
in
g on
the
speeds
o
f
th
e
lens
and
film. A noteworthy feature
of
this
exposu re
meter
is
that it covers
a
wide
range
of
exposu re va
lu
es.
If you are shooting with
F uj
icolor
N
1
00 (ASA
100)
film
using
a 50mm
F
1.4
lens, for
example,
th
e
range covered would
be
EVl
~
EV 18
(f/
l
.4 1
sec.
~
f
/ 16 1/
1000
sec
.)
.
If
th
e lens
i
s 55mm
Fl.8. the range
is from EV
1.
7
~
EV
18 (f/l.8
1 sec.
~f
/
1
6
1/
1000 sec
.
).
T
he chart shows
the light measuring range
of
the
FUJ ICA ST701 's
exposu re
mete
r
.
A built-in
safety
d
evice
holds the
ope
ration
of
the
shutter speed
Selecto
r
D
ial
w ithin
the
range
given
in
the chart.
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