Olympus CX41 Manual de instrucciones - Página 16

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Fig. 17

Fig. 18

Fig. 19

CH2-DS

Fig. 20

Aperture Iris Diaphragm

· The aperture iris diaphragm determines the numerical aperture of the

illumination system. Matching the numerical aperture @ of the

illumination system with that of the objective provides better image

resolution and contrast, and also increases the depth of focus.

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

the condenser aperture iris diaphragm to between 70% and 80% of

the N.A. of the objective in use is usually recommended. If necessary,

adjust the ratio by removing the eyepieces and looking into the

eyepiece sleeves while adjusting the aperture iris diaphragm knob ²

until the image shown in Fig. 17 is seen. (Fig. 18)

#If the aperture iris diaphragm is set too small, image ghost may be

observed.

Using the numerical aperture scale:

}Align the aperture iris diaphragm knob ² with the NA value @ on the

scale. The scale value should correspond to the NA number engraved

on the objective.

Since the aperture iris diaphragm knob has a certain width, align the

center line engraved on the knob with the scale indication.

When using a 100X objective, turn the aperture iris diaphragm knob ²

all the way to 0.9 on the scale. (Fig. 18)

Using Filters

}You can place a filter in the light path with either method.

· Insert a filter with diameter of 32.5 mm @ in the condenser accessory

(CH2-FH or CX-AL) attached below the condenser.

· Insert one or more filter with a diameter of 45 mm ² on the light exit

glass on the microscope base.

}For the types of the filters, please consult Olympus or its catalogues.

Using Darkfield Ring CH2-DS

}The CH2-DS can be attached in the same way as inserting the 32.5

mm filter.

Usage

Inserting the darkfield lens makes possible darkfield observations

using a 4X to 40X objective.

(Figs. 17 & 18)

(Fig. 16)

(Fig. 19)

(Fig. 20)