Aperture Diaphragm - Optika Italy ECOVISION Serie Manual De Instrucciones

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8.5

Aperture diaphragm

The Numerical Aperture (N.A.) value of the ap-
erture diaphragm affects the image contrast. In-
creasing or reducing this value one can vary res-
olution, contrast and depth of focus of the image.
Move the diaphragm ring ① (Fig. 10) on the value
corresponding to the objective in use. In this case
the optimal setting of the condenser is achieved.
With low contrast specimens set the numerical
aperture to about 70%-80% of the objective's
N.A. If necessary, remove on eyepiece and, look-
ing into empty sleeve, adjust the condenser's dia-
phragm in order to obtain an image like the one
in Fig. 11.
APERTURE
DIAPHRAGM
FIELD OF VIEW
Page 11
F ig. 10
F
ig. 10
70-80%
30-20%
F ig. 11
F
ig. 11

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