Minolta Flash meter IV User Guide

Apertu
re-
priority
flash
metering
The Flash
Meter IV
permits
aperture-priority
flash metering
in
addition
to ambient
light
metering of daylight and
tungsten
light.
i
;:1
,
.r
.
, :
.,
Since
ambient
light
exposures are
controlled
by the aperture,
which
Controls the
.,,.,
amount of
light striking
the
film, and shutter
speed,
which
controls the
length of time'r
this
light
strikes
the
film, one
must determine
the aperture
for
shutter-priority
metering
and,
conversely,
the shutter
speed
for
aperture-priority
metering.
However, tne
flasn
unit's
duration is
very short, and
with most cameras,
it is not
,
.:
possible
to control
the amount
of time
lighifrom the flash
strikes
the
film
plane.
i)''
Accordingly, the
aperture
is
normally adjusted to
control the
amount of
light
reaching
thb
film.
(On
automatic
flashes the
flash duration
is controlled.)
ln conventional
metering systems
(the
Minolta
Flash Meter III), the
shutter speed
was
set
(within
the
camera's X-sync
range)and the
aperture
was calculated for the
amount of
flash and
ambient
light
which would strike the
receptor at this shutter
speed.
Since the
Flash
Meter IV employs separate
metering
and adjustment
for ambient
and
flash exposure
which can
indicate the amount
of flash light,
the scene
can
be
metered with
the required X-sync shutter
speed
and
desired aperture,
and
the
meter
will indicate
how much
additional flash
light
(expressed
as
a
'guide
value"
IGW
is
required for
the
exposure.
This
figure is
based on
a
constant
(unvarying)ambient
light
level, and
indicates
how
many stops the
power
level must
be increased
or decreased
to
provide
a
proper
exposure
at the specified
aperture.
For
example,
less d'epth
of field was
desired
in
the
photograph
at
right. Accordingly,
the aperture
was set to
f/16, and the meter
indicated
*
1
GV
indicating
that
flash
illumination must be
reduced one stop,
i.e.
power
should
be
reduced
lo
1t2 the
current
level.
Similarty,
if +'1 GV
is indicated, the
power
level should be
increased one stop.
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Minolta Flash meter IV Specifications

General

Light Receptor	Silicon photo cell
ISO Range	ISO 3 to 8000
Shutter Speed Range	30 min to 1/8000 sec
Display	LCD
Type	Handheld Flash Meter
Measuring Modes	Ambient, Flash
Measuring Range (Ambient)	EV -2 to EV 19.9 (ISO 100)
Measuring Range (Flash)	f/1.0 to f/90.9