Optika Italy B-800 Serie Manuel D'instructions page 10

Diopter adjustment
Adjust the fine focusing knob
to get the image sharp and
clear while observing with
your right eye, then turn the
left diopter ring to a sharp
and clear image also with the
other eye. The highpoint eye-
pieces allow the user to wear
glasses. (Fig.13)
NOTE :For the optimal para-
focality of the image, it's sug-
gested to wear your glasses
during the normal use of the
microscope.
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
Page 10
④
APERTURE IRIS
DIAPHRAGM IMAGE
OBJECTIVE PUPIL
Fig.13
②
Fig.14
70-80%
30-20%
Fig.15