Olympus BX60 - Condenser Centering; Field Iris Diaphragm

fig. 62
Condenser Centering
(Figa. 62,63,64)
1. Turn the condenser height adjustment knob® and raise the condenser
to its upper limit. (Fig. 52)
2. Focus on the specimen using the 10X objective.
* When using the U-SC swing-out condenser, move the top lent
Into the tight path.
3. Rotate the field iris diaphragm ring fj> in tha direction of the arrow to
where the diameter of the diaphragm image is at its smallest
4. Turn the condenser height adjustment knob <J) to where the diaphragm
image is seen in sharp focus within the field of view.
5. Turn the two condenser centering screws ® to move the diaphragm
imago to the center of the field of view.
6. Gradually open the field iris diaphragm. The condenser is properly
centered if the diaphragm image is centered and inscribed in the field
of view.
7. During actual use. open the field diaphragm slightly until the image
circumscribes tha field of view.
ot*
Field Iris Diaphragm
J
The field iris diaphragm restricts the diameter of the beam of light
entering the objective and thus excludes extraneous ight, improving
image contrast. The diameter of the field iris should be 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 I
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