E59E58
Special FunctionsSpecial Functions
Measuring lighting ratio using the
Flat Diffuser
The lighting ratio is the brightness ratio between the highlight and shadow
areas of a composition. For example, if the difference in measurement
values (exposure difference) obtained by an incident light measurement is
one stop, the lighting ratio is 2:1; if it’s two stops, the ratio is 4:1. In general,
lighting ratios from 4:1to 8:1 (exposure difference of 2 to 3 stops) are
considered best when using color films, since these ratios allow colors to
be reproduced naturally.
By adjusting the lighting ratio, you can control the subject’s highlight-to-
shadow relationship or the relationship between the main subject and the
background when photographing people or objects in a studio.
To check lighting characteristics such as the brightness difference between
a main subject and background, a Spherical Diffuser can be used in most
cases. However, if a subject is receiving light from different directions, it is
necessary to measure the brightness of the individual light sources
illuminating it, using a Flat Diffuser (incident light measurement, see page
14).
This allows control over the shadow areas of the main subject. By
replacing a Spherical Diffuser with a Flat Diffuser, the brightness of light
sources illuminating a subject can be measured individually, and the
lighting ratio can be checked easily. In addition, you can use the meter’s
memory function and brightness difference function to read these values
easily.
1
Attach a Flat Diffuser to the
receptor of the instrument.
See page 14 for details on
how to attach a Flat
Diffuser.
3
Set the measuring mode
with the MODE button
according to the light
source to be measured.
2
Prepare the meter for
taking a reading.
Battery (p. 9)
↓
Film speed (p. 12)
4
Specify the desired shutter
speed with the up/down
dial.
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