Olympus DP74 Instructions Manual page 49

Problem
The image is too dark.
The peripheral area of the image
is dark.
Cause
The exposure correction is set to the -
side beyond the appropriate value.
The bright area of the image is set as
the metering area.
AE lock, which was set when the
exposure time was shorter than the
currently required exposure time, is
active.
The output highlight level of the level
adjustment is too low.
The illumination of the microscope is
too dark
The peripheral area is dark due to the
matter of optical performances.
Remedy
Return the exposure correction value
to 0 and set the appropriate exposure
correction value.
Set the area where you want to meter
as the metering area.
Cancel the AE lock.
Reset the current level adjustment and
adjust the level properly again.
Adjust the brightness by increasing the
illumination intensity of the microscope
or disengaging the attenuation filter
from the light path.
Perform the shading correction.
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