Olympus BX61 Manuel d'instructions - Page 23

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3-5 Condenser

Fig. 32

Fig. 33

Centering the Condenser

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.)

BX61

(Figs. 32 & 33)