Sekonic L-358 - Manual (Page 27)

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3. Brightness difference function
This function is useful for evaluating studio lighting and checking the evenness of the lighting set-up
across the subject area.
Take a measured value at a certain point as a standard value. The difference between the standard
value and a new measured value is displayed as EV and the measurements on the analog scale.
Example of adjusting lights using brightness measurement with shutter speed priority mode of Inci-
dent light.
1. Turn the Lumisphere retracting ring q to lower it to the
mark position.
2. Turn any secondary light source off. Point the
Lumisphere w toward the main light source, from the
position of the subject and take a measurement. Press
the Memory button u and store the value in memory.
3. Press the Average/ EV button r and display the "A"
mark on the LCD indicating a standard value.
4. Turn the main lighting off. Now, point the Lumisphere
toward the secondary light source. While the Measuring
button !5 is depressed and held down, the indicated
difference between the main and auxiliary light sources
is displayed in EV values. At the same time, the
standard value and a new measured value are
displayed on the analog scale. A lighting ratio (contrast
ratio) can be found in the scale below.
6. Advanced Functions
Memorized f stop value
Set shutter speed
Difference
in EV
f stop value being measured
Now on reading
AVE./∆EV
MEMORY
AVE./∆EV