Minolta Flash meter IV User Guide

Whether
working
under
continuous
light
sources
such
as sunlight
or tungsten
bulbs,
or with
instantanieous
light sources
such
as electronic
flash,
photography is a
process
in which
illumination
from the
light
source
strikes
and
is
reflected
off the
subject,
passes
through
the
camera
lens and
forms
an
image on
a
light-sensitive
surface.
A
mechanism
for controlling
the
lens aperture
and
shutter
speed,
as
well
as flash
output
when
using
flash
light,
is required
to
make sure
the
right
amount,
of
light
reaches
the
film olane.
There
are two
basic
ways
of
measuring
this
brightness:
incident
light
metering
systems
which
indicate
the
required
exposure
by
measuring
the amount
of
light
(llumination) illuminating
the
subject,
and
reflected
light
metering systems
which
indicate
exposure
by
measuring
the
amount
of
light
reflected
off the
subject
(luminance)
and
received
by the
camera
(See
Fig.
1).
'
The Minil1a
Flash
Meter IV
permits
incident
light metering
with spherical
diffusers,
mini
receotors
or
flat diffusers,
or
reflected
light metering
with
Viewfinder
5o
or View-
finder
10d II, a
reflected
light
attachment
(40'
acceptance
angle) or
the
Minolta Booster
II.
Selecting
which
metering system
should
be used
cannot
be
reduced
to simple
Suidg-
,
lines based
on specific
photographic
situations
or
whether
the
receptor
is directed
at
r
the subject
or
the camera.
Rather,
the selection
should
be
based on
a thorough
under-
standing
of the
differences
between
the
merits of
the two
systems.
To
ddmonstrate
the differences
between
incident
and
reflected
light
metering
systems,
we
photographed
black,
gray,
and white
wallpaper
samples
(respective
reflection
faciors
[ii.,
the
ratio
of
reflected
light to
incident
light
on the
sublect]
of
approx.
4o/0,180/i
and90%)
shown
on
page
3
under
the same
light conditions
and
metereO
with
the
Flash Meter
IV.
The
pictures
in
group
A
were exposed
as indicated
with incident
light
metering;
those
in
group
B were
exposed
as
indicaled
with
reflected
light metering.
Fig. 1
Incident
light
metering
Reflected
light
metering
lncident
liqht
Light source
|Jl
l-ll G
rl
ml
lncident
light
metering
Camera
(using
spherical
recePtor)
Reflected
light
metering
Reflected
light metering
(ref
lected
light attachment)
www.orphancameras.com

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