Olympus CX23 Anleitung Handbuch - Seite 19

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Aperture stop

The aperture stop of the condenser is a mechanism to adjust the numerical aperture of the condenser to make the incidence

angle of the illumination light to the value suitable for observation.

The observation is available with optimum contrast and resolution by adjusting the numerical aperture of the condenser

appropriately for the numerical aperture of each objective lens.

In general, since the contrast of the microscope specimen is low, it is appropriate to set the numerical aperture of the

condenser to approximately 70 to 80% of the numerical aperture of the objective lens.

The condenser of this product is designed so that the numerical aperture of the condenser is approximately 70% of the

numerical aperture of the objective lens by coinciding the aperture stop lever position with the magnification display position

corresponding to the magnification of the objective lens to be used.

Numerical aperture of objective lens and numerical aperture of condenser suitable for observation

Objectives

Plan objective lens

(FN 20)

CX22PL100XO (option)

Numerical

Magnifi-

aperture

cation

N.A.

0.10

10X

0.25

40X

0.65

100XO

1.25

Numerical aperture of condenser suitable for

observation of microscope specimens

(when setting to 70% of numerical aperture of objective lens)

0.1 X 0.7 = 0.07

0.25 X 0.7 = 0.175

0.65 X 0.7 = 0.455

1.25 X 0.7 = 0.875

CX23