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ow to use the Lumidisc
9.1
How to measure light contrast
@) Fit the Lumidisc on the light receiving part.
See page 3 ‘3.2 How to fit the Lumidisc’.
@ Select the light mode you are going to use with the mode
selector.
@ Hold the L-308BII close to the subject and point the
Lumidisc toward the main light source (turn off the
auxiliary light source). Take reading.
@I Keep holding the L-308BII close to the subject and point the Lumidisc toward the auxiliary light
source (turn off the main light source).
0
Compare the difference in brightness between the main and auxiliary light sources, and
determine the contrast.
(Example) If you read F16 for the main light source and F8 for auxiliary light source, the
difference between them is two F stops. Then you will obtain 4:1 contrast as shown
in the above table.
NOTE
l To obtain exposure, hold the L-308Bll close to the subject and point the
Lumisphere towards the camera with the main light and auxiliary light on.
9.2
Using the L-308B II as an illuminance meter
01 Fit the Lumidisc on the light receiving part.
0
Select the EV metering mode and set the film speed at IS0 100.
@I Face the Lumidisc toward the lighting and hold the L-308Bll parallel to the subject and take
reading.
@ Determine the brightness level using the following conversion table.
X?
EV to lx conversion table
(Example) If you read
EV9
$1
_,
the approx. illuminance
value is 1800lx.
10
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