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4-2. Setting Light Receiving System
4-2-1.
Measuring with Incident Light Function (Lumisphere Extended /Retracted)
Use either extended or retracted (at) lumisphere
to measure incident light. Point the lumisphere at
the camera (lens optical axis) from a position close
to the subject and then measure.
1. Extending Lumisphere
Rotate the Lumisphere retracting ring
2
to
align the mark with the extended symbol (
)
on the meter head.
2. Retracting Lumisphere
Rotate the Lumisphere retracting ring
2
to
align the mark with retracted symbol (
)on
the meter head.
Lumisphere alighining mark
Lumisphere
retracting ring
2
Lumisphere
retracting ring
2
Extended ( ) Retracted ( )
Lumisphere Extended Lumisphere Retracted (at)
Lumisphere Retracted (at)
Retract lumisphere when measuring at subjects
such as manuscripts, books, pictures, green
screens, or when measuring lighting ratio
(Contrast function) (see P50 for details) or simply
measuring intensity of illumination (see P28 for
details).
,
•
Try to minimize the inuence fo the person taking the light measurements. (Do not obstruct the light sources. ere
will also be reected light from the person’s clothing, so do not allow this reected light to enter the light receptor.)
•
If the light meter is used with the Lumisphere retracting ring in a middle position, distributed light quality will change,
and suitable measurements cannot be made.
•
Do not push down the lumisphere with your hand.
•
Because it may aect the precision of the measurements, be careful not to damage or dirty the Lumisphere/Light
receptor. When Lumisphere becomes dirty, wipe it with a dry, soft cloth. Never use organic solvent such as thinner or
benzene.
23


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