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Incident light measurement (with diffusor)
This method gives a correct reading in those
special cases of high-contrast subjects, where
detail measurement cannot be achieved. Main
uses: against-the-sun shots, objects with brilIiant
background (snow, water, beach) and close-ups
of small objects with contrasty background. To
get correct reading, point camera in opposite
direction to measure the illumination received by
the subject. Place diffusor in position over
holding knobs on the photo cell and aim towards
the light falling on the subject from the direction
of the intended camera position. Incident light
measurements are taken at the subject or at a
position identically illuminated. The reading
corresponds to an average subject brightness.
According to whether the important part of the
scene is darker or brighter than the average, the
diaphragm should be opened or closed by 1/2 stop.
A general rule in strong sunlight:
Give preference to whichever measuring method
that does not expose photo cell to direct rays of
the sun.
When not in use, the photo cell need not be
covered. The diffusor is kept in the front flap of the
ever ready case.
A protective cover can be placed over the focusing
knob. The shock mounted exposure meter is
ruggedly built; duration and intensity of the light
falling on the cells will not effect its accuracy.
29


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