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Centering the
condenser
Insert the swing-out lens of
the condenser
①
and fully clo
-
se the field diaphragm
②
. Ro-
tate the condenser adjustment
knob
③
until you see a sharp
image of the closed field
diaphragm (a bright spot of
light). Act on the condenser
centering screws
④
until you
move the bright spot in the
center of the image field. Then
re-open the field diaphragm
②
. (Fig.14)
Adjust the aperture of the iris
diaphragm under the conden-
ser to set the numerical aper-
ture of the illuminator, thus
controlling image contrast and
resolution. It is suggested to
set the aperture diaphragm
between 70% and 80% of
objective’s N.A. (Fig.15)
①
③
④
②
Fig.14
APERTURE IRIS
DIAPHRAGM IMAGE
CENTERING THE CONDENSER
OBJECTIVE PUPIL
30-20%
70-80%
Fig.15
