19
BX61
3-5 Condenser
1 Centering the Condenser
(Figs. 32 & 33)
1. Fit the Allen screwdriver @ into the condenser height adjustment screw
and turn the tool counterclockwise to raise the condenser to its upper
limit.
2. Focus on the specimen using the 10X objective.
# When using a swing-out condenser, move the top lens into the light
path.
3. Rotate the field iris diaphragm ring ² in the direction of the arrow so that
the diaphragm image comes inside the field of view.
4. Turn the Allen screwdriver @ to focus on the diaphragm image.
5. Fit the Allen screwdrivers into the two condenser centering screws ³
and turn them to move the iris diaphragm image to the center of the field
of view.
6. Gradually open the field iris diaphragm. The condenser is properly cen-
tered if the iris image is centered and inscribed in the field of view.
7. During actual use, open the field diaphragm slightly until its image cir-
cumscribes the field of view.
Effects of Field Iris Diaphragm (Fig. 33)
The field iris diaphragm restricts the diameter of the beam of light enter-
ing the objective and thus excludes extraneous light, improving image
contrast. The diameter of the field iris should e adjusted for objective
power to the extent that it just circumscribes the field of view. (See “Com-
patibility of Objectives and Condensers” on the next page.)
Fig. 32
Fig. 33
@
²
³
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