Sekonic Speedmaster L-858D-U Light Meter - Manual (Page 49)

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4. Basic Operations
3) Interchanging the Extended Lumisphere and Retracted
Lumisphere
1. Extending Lumisphere
Extend the Lumisphere to measure the illumination of people, buildings, and other
three dimensional subjects.
Rotate the top of the Lumisphere Retracting Ring
1
to securely align the mark on the
ring with the lumisphere mark ( ).
2. Retracting Lumisphere
Retract the Lumisphere to measure the illumination of flat subjects such as
manuscripts, books, or paintings, measure the illumination ratio (Contrast Function),
and simply measure the illuminance.
Rotate the Lumisphere Retracting Ring
1
to securely align the mark on the ring with
the retracted lumisphere mark ( ).
Lumisphere Retracting Ring
1
Lumisphere Aligning Mark
Extended Mark Retracted Mark
Lumisphere
2
NOTICE
● Try to minimize your influence on the light measurement. Do not block the light
falling on the subject with your hand or body. Do not allow light toned clothing to
reflect light into the meter.
● Do not set the Lumisphere Retracting Ring
1
to an intermediate position. This will
change the quality of the light and produce an incorrect measurement.
● Do not push down the Lumisphere
2
with your hand.
● Because it may affect the precision of the measurements, be careful not to damage
or contaminate the Lumisphere 2 . If the Lumisphere 2 becomes dirty, wipe it
with a dry soft cloth. Never use organic solvent such as thinner or benzene.