Shown here is an example of using Lumisphere and by normal measuring method without slide, meter needle indicates 640 foot candles. 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. | mark and the | |
If the measured value is set to the dial scale | ||
| 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.
