Manual Sekonic L-718 (page 14 of 16) (English)

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Contrast Metering for Lighting Balance

When calculating a desired lighting balance, DIGI MASTER can be used

to measure the brightness of main and fill-in lightings from the subject

position.

(1) Mount the Lumidisc instead of

Lumisphare for usual incident light

measurement.

(2) Select the measuring mode, and set

the ISO sensitivity and shutter speed

(T) as shown in the paragraphs for

“Preparing the Meter for Operation”.

(3) Point the center of Lumidisc

accurately toward the center of axis

of the main lighting source from the

subject, and measure the light

according to the measuring method

for the respective mode.

(4) Using the same procedure, measure

the fill-in light(s). In this case, be sure

that the meter is held so that it is not

influenced by the main lighting

source.

(5) The F-stop difference between the

main and fill-in lighting sources is

lighting contrast ratio (Table 1).

< NOTE >

• In case of the measurement for F-

stop value, memory display

function (refer to page 20) is useful

for this metering.

Difference in Contrast ratio

exposure reading

1 2 : 1

1 1/2 3 : 1

2 4 : 1

3 8 : 1

4 16 : 1

5 32 : 1

(Table 1)

Illuminance (Lux) Measurement

DIGI MASTER can be used as an expendient Lux meter when used with

the Lumidisc in ambient light measurement mode.

(2) Set the ISO sensitivity to ISO 100.

(3) Press the F/EV selection key

and select EV mode.

(4) Hold the meter so that the Lumidisc

is parallel to the plane to be

measured, and press the

measuring switch.

(5) The measured EV value can be

converted to the corresponding Lux

value using the (Table 2).

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Sekonic L-718 Manual

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