Olympus CHT Manuale di istruzioni - Pagina 16

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Fig. 26

locking of the pre-focusing lever

This lever

(I)

is jJrovided to prevent possible conlact between speci,

men arid objeclive as well as to simplifv coarse locusing The

le~'€'r

locked in the direction of the arrow in Fig. 26, after coarse focus

has

been

cC'o plished,

Thi~

l<.

convenient for liquid

apol

cation or

change of specirnens, roo. since

it'

prevenl5 further upward lravel 01

,he

stage bV means oj the coarsl3 adjUst ent knobs, and provides a

I'rnitlng stop if the

St;:ly8

is lowered and then raised again. The pTe-

focusing lever does not restrict fin.e foCUsing.

Unlock this lever when not in use.

If)

Use of immersion objectives

1) To utilize the full numerical aperture of an irnmersion objective [wilh

inscription "oil"), the

ob~ec;tive

alld spEo:cim n i:!re

Imr'llSHed

in an im-

mersion oil in a lollowing procedure:

2) Focus on the specimen with a low power objective.

Put a drop of immersion oil on the sJ:ecimen slide and the front lens

of the immersion objective.

4} Turn the nosepiece

bring the immersion objeclive inlO the light path,

and focus 'I,-,ith the Hne adjuslment knobs.

Use of the pre·focusing lever facilitates steps 2) through 4) above.

Care should be taken to prevent oil bubbles from forming in the oil

film; jf any. re-apply immersion oil, since these bubbles greatly

deteriorate the lens performance.

Be careful not to stain other objectives with immersion 'oil, and

after use, carefully wipe off the immersion oil on the objective, etc.

completely.