Olympus BX51 Petunjuk Manual - Halaman 22

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3-5 Condenser

Fig. 29

Fig. 30

Centering the Condenser

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 the U-SC3 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. Manipulate the condenser height adjustment knob @ to focus on the

diaphragm image.

5. Turn the two condenser centering screws ³ 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. 30)

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.)

(Figs. 29 & 30)