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Shown here is an example of using
Lumisphere and by normal measuring
method without slide, meter needle
indicates 640 footcandles. With film
sensitivity of ISO 100, exposure
becomes f 45
and shutter speed 1 second. mark at
this time indicates 20.
This 20 indicates the exact center point of the luminance range. In the same
condition, install Lumigrid and when standard reflectivity of 18% is measured, this
means that the dial scale will indicate 20. When determining exposure by using the
Lumisphere or Lumidisc,
the
mark will always indicate the center of luminance range,
regardless of whether or not the High slide is inserted.
If the measured value is set to the dial scale
mark and the
mark dose not reach the scale, reflected light measurement
with the Lumigrid cannot be performed due to insufficient incident light strength. In
other words, if the incident light is less than 160 footcandles, reflected light
measurement cannot be performed with the Lumigrid.