Olympus BX61 Gebruiksaanwijzing - Pagina 24

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Aperture iris

diaphragm image

Objective pupil

Fig. 34

Fig. 35

Compatibility of Objectives and Condensers

Objective

Magnification

1.25X

10-60X

100X

* When using the U-SC3 swing-out condenser together with a 1.25X to 4X objective, fully open the condenser aperture iris

diaphragm and use the field iris diaphragm in the base as aperture diaphragm. With the 1.25X to 2X objectives, the

surroundings of the field of view may become dark.

}To obtain better illumination in photomicrography using a 1.25X to 4X objective, use of the U-ULC-2 for ultralow magnifi-

cation is recommended.

Aperture Iris Diaphragm (Figs. 34 & 35)

70-80%

· The aperture iris diaphragm determines the numerical aperture of the

30-20%

· Since the contrast of microscope specimens is ordinarily low, setting the

}Using the numerical aperture scale:

N.A. scale

Achromat/aplanat

U-AAC

Applicable

(FN 26.5)

illumination system. It has an effect of adjusting image resolution and

contrast. Stopping down the aperture iris diaphragm increases the depth

of focus.

condenser aperture iris diaphragm to between 70 and 80% of the N.A. ²

of the objective in use is usually recommended.

Adjust the ratio by removing the eyepiece and looking into the eyepiece

sleeve while adjusting the aperture iris diaphragm ring @ until the image

shown in Fig. 34 is seen.

You can use the condenser numerical aperture scale by adjusting the

aperture iris diaphragm ring @. (Fig. 35)

Condenser

Swing-out

U-SC3

Applicable to FN 22

Applicable (FN 26.5) by moving

top lens out of the light path.*

Engage top lens in light path.

(FN 26.5)

Motorized universal

U-UCD8A

Applicable when U-FWCO1.25X

is combined.

Applicable (FN 26.5) by moving

top lens out of the light path.

Engage top lens in light path.

(FN 26.5)