Gossen MetraWatt Multi Pro Instruction Manual page 55

When reading reflected light, the meter is
pOinted towards the subject and light
reflected from the subject passes through a
collecting lens onto the measuring cell
within an angle of 30° (ambient light) or 20°
(flash) - for further details see page 36
"Measuring fields of the Multi Pro". The
resultant reading depends on the intensity
of the light and the reflecting properties of
the scene. Thus , under identical illumina-
tion , the indication will be less by dark
objects than by bright ones. The Multi Pro
computes the light and dark portions and
indicates an average value. Therefore, if
either dark or light areas predominate , bet-
ter results will be obtained with the method
of incident light measurement (page 32) .
The small measuring angles of 30° or 20°
respectively enable you to aim the meter
precisely at the areas in your subject you
wish to measure.
You can scan various parts of the scene to
determine the degree of contrast in the sub-
ject. For grey card measurements the small
measuring angle is an advantage. Care
should be taken that only the grey card itself
is being measured. To make such a mea-
surement, place the grey card in the area of
greatest importance in the scene.
When reading incident light the spherical
diffuser is placed in front of the measuring
cell window and pOinted towards the cam-
era i.e. opposite direction to the subject
being photographed. The diffuser should
receive the same light intensity and distribu-
tion as that falling on the subject. The result-
ing measurement is primarily determined
by the illumination while the reflecting prop-
erties of the scene will have only a minor
influence on the measuring result. The
method of incident light measurement is
generally preferable, and you can prove
with your Multi Pro that this method gener-
ally leads to the best exposures under dif-
ficult conditions.
Incident light readings are most valuable
when determining exposures where the
subject is inaccessible or difficult to reach .
You just take the incident light reading at
a substituted spot which receives the
same illumination as your subject. Instead
of pOinting the Multi Pro toward the camera,
point it parallel to an imaginary line from
subject to camera.
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