30
Fig. 43
4-6 Condenser
1
Centering the Condenser
(Figs. 43 & 44)
1. Turn the condenser height adjustment knob @ 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. Using the touch panel controller, stop down the field iris diaphragm until
its image comes inside the field of view.
4. Turn the condenser height adjustment knob to focus on the diaphragm
image.
5. Fit the Allen screwdrivers into the two condenser centering screws
2
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
centered if the iris image is centered and inscribed in the field of view.
7. During actual use, open the field iris diaphragm slightly until its image
circumscribes the field of view.
Effects of Field Iris Diaphragm (Fig. 44)
The field iris diaphragm restricts the diameter of the beam of light entering
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 “Compatibility
of Objectives and Condensers” on the next page.)
} With certain condensers, the field iris diaphragm image may not be visible
when a 100X objective is used.
Fig. 44
1
2
Summary of Contents for BX63
Page 55: ......
