Centering The Condenser - Optika 500 Serie Manual Del Usuario

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)
③
①

CENTERING THE CONDENSER

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④
APERTURE IRIS
DIAPHRAGM IMAGE
OBJECTIVE PUPIL
②
Fig.14
70-80%
30-20%
Fig.15