Olympus CH30 Manuel d'instructions - Page 16

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Fig. 21

ση

apn image

Eyepiece

FE Se

Objective pup

Fig. 23

Fig. 24

certering ne Fiea ris Diaphragm (CH40 only) (Figs. 21,22)

1 . With the 10X objective engaged and the specimen brought into focus,

turn the field iris diaphragm dial @ counterclockwise to stop down

the diaphragm somewhat. (Fig. 21)

2 . Tum the condenser height adjustment knob @ to bring the field iris

diaphragm image into focus. (Fig. 21)

3 . While gradually opening the field iris daphragm image, rotate the two

centering knobs @ of the compensating lens to adjust so that the field

iris diaphragm image is centered in the eyepiece field of view.

(Figs. 21, 22)

4. To check centration, open the field iris diaphragm until its image

touches the perimeter

of the field

of view. If the image is not precisely

inscribed in the field of view, center again. Fig. 22)

5 . When used for actual observation, open the field iris diaphragm until

its image just circumscribes the field of view.

mounted on the CH30, center the diaphragm in the same manner as

described above.

Aventure iris Diaphragm

(Figs. 23,24)

illumination system with that of the objective provides better image

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

the condenser aperture iris diaphragm to 70-80% of the NA. of the

Objective in use is usually recommended. When necessary, adjust the

ratio by removing the eyepiece and looking into the eyepiece sleeve

while adiusting the aperture iris diaphragm lever () until the image

shown in Fig. 23 is seen.