6. Advanced Functions
1. Measuring Light Contrast
This method is used to check studio lighting or lighting unevenness.
1) Mount the Lumidisc accessory (see page 8).
2) Turn ON just the main light source.
Point the Lumidisc at the main light source
from the subject position and then
measure.
3) Next turn ON just the secondary light
source.
In this state now point the Lumidisc at the
secondary light source and measure.
4) Determine the luminance ratio (contrast
ratio) using the differrence of measuring
values of the main light source and the
secondary light source.
REFERENCE: • To determine exposure in incident light, turne ON botn main
light source and secondary light source, point the Lumisphere
at the camera lens axis and then measure.
Contrast Ratio
１ ２：１
１.５ ３：１
２ ４：１
３ ８：１
４ １６：１
５ ３２：１
EV Difference of
Measuring Value
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