OPERATION
Axio Lab.A1 Lighting and contrasting method in transmitted light Carl Zeiss
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1 Slide 6x20 with O/4 plate
2 Lower section of circular polarizer
3 Lever for rotating O/4 plate
4 O/4 plate in upper part of the circular polarizer
5 Adjustment slits
Fig. 4-16 Components for circular polarization contrast on conoscopy stand
x An (anisotropic) specimen should not be observed until after the above adjustment.
x Reinsert the specimen to be examined.
In their interference color – dependent on material, specimen thickness and orientation – the specimens
appear constant and independent of stage rotation.
For a high-contrast image with higher objective enlargements (from approx. 20x) the
illumination aperture must be reduced to a value between 0.15 and 0.20, i.e. the aperture
diaphragm must be closed accordingly.
The effect of the O/4 plate (Fig. 4-16/4
) can be undone by either swiveling it out of the light
path or turning it with lever (Fig. 4-16/3) into one of its two click-stop positions.
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