Operation Manual

50
6-4. Contrast Function
This function is useful for evaluating studio lighting, checking evenness of backgrounds such as
green screens, and quick set up of lighting ratios.
After establishing a standard value, press and hold the Measuring button
8
to display the
dierence between the standard and new measured value. The exposure value will change to an
EV value (dierence in stops) change as brightness of the measured value changes. The Analog
Scale will display the current measured value.
* If no values are in memory, the standard value will be the last value measured. If values
are in memory, the standard value will be the average of all memorized values.
Creating Lighting ratios with Contrast Function (in Shutter Speed Priority Mode in incident light):
Retract the Lumisphere when making contrast readings.
1. Rotate the Lumisphere retracting ring
2
until
fully switching to the at position.
2. Switch ON the main light source and point the
retracted lumisphere at the light source from
the subject position.
3. Touch the Average/ΔEV icon
at the bottom
of the screen to use the current reading (or
memorized value) as “Standard Value" and display
AVE on the measuring screen. The Average/ΔEV
icon
will appear in reverse as long as it is the
Contrast Function is active.
4.
Next turn ON a second light source (ll light, hair
light, etc.). Point the retracted lumisphere at the
source from the subject position and press the
Measuring button
8
. The display will change
from exposure setting to EV value and indicate the
dierence in brightness between the Standard and
the second value being measured. The analog scale
will also display the two values. The table below
shows the lighting ratio according to the dierence
in brightness.
EV Dierence of Measuring Value Illumination Ratio
1 2:1
1.5 3:1
2 4:1
3 8:1
4 16:1
5. To return to normal measuring, touch the Average/ΔEV icon
again.
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
Todeterminethenalexposureaftersettingthelightingratio,extendthelumisphere,switchONalllights,andpoint
theLumispherebacktowardsthecamerafromthesubjectpositionandpressthemeasuringbutton.

eContrastFunctionalsocanbeusedwhenmeasuringwithreectedlight.
Lumisphere retracting ring
2
Setting
value
Touch AVE/
ΔEV icon
Example of Main Light
Source Measuring
Example of while contrast
function is active
Measuring value (f-stop)
using main power supply
Measuring value (EV) while metering
with support light source
Memorized f-stop
(main power supply)
Monitored f-stop (support
light source) during measuring
Setting
value