Olympus BX-RLA2 Руководство по эксплуатации - Страница 12
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Fig. 3
70%
30%
Aperture iris diaphragm image
9
3
Centering the Aperture Iris Diaphragm (AS)
²
1. Slide the mirror selector lever @ to "BF".
2. Engage the 10X objective by rotating the revolving nosepiece and bring
the specimen in approximate focus.
³
3. Remove the eyepiece, look into the eyepiece sleeve and pull the AS knob
² so that the aperture is about 70%.
4. If the center of the iris diaphragm is deviated, center it by rotating the two
AS centering screws ³ using the Allen screwdriver.
|
Using the Aperture Iris Diaphragm
{In reflected light brightfield observation, optimum observation is gener-
ally possible by setting the aperture to between 70% and 80% of the
aperture number of the objective.
{In reflected right darkfield observation, the aperture must be fully opened
by pushing in the AS knob ².
}With some specimens, an image with high contrast and little flare may
sometimes obtained when the aperture is slightly closed. It is therefore
recommended to also try a slightly closed aperture.
(Fig. 3)