Olympus CHT Manuel d'instructions - Page 15

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Fie.

Exi l pupil

of objectille

(Image of aperture diaphragm as seen

through empty eyepiece tube)

Fig.

Field iris diaphragm

Fig. 24

Fie.

Adjustment of the a erture iris diaphragm

The opening of the aperture iris diaphragm built in the condenser

can be adjusted to match with the numerical ar::erture of the objec-

tive in use, in order to achieve optimum objective performance as

depth of focus, image cDlltr'ast and resolution.

T urni ng the diaphragm lever

counterclockwise reduces the d ia-

phragm or::ening. (Fig. 22)

2) Remove the eyepiece, and looking at the exit pupil of the Objective

through the empty eyer::iece tube, adjust the opening of the diaphragm.

Generally, i

is preferable to stop down the aperture diaphragm to 70%

80% of the objective

(Fig. 23)

1ft he specimen isl igh lIy stained, or al most colorless and tra nsparent,

further reduce the diaphragm or::ening to increase contrast for better

image observation. Be careful, ho'wever, if the diaphragm is stopped

down too much, the resolution will be deteriorated.

Adjustment flf

the field iril-diaphragm (for 'CH2-F-S only'

') The field iris diaphragm controls the diameter of the ray bundle im-

pinging on the specimen and therefore, by stopping down the field

diaphragm until it is slightly larger than the field of vi

e'.'J ,

it can reduce

stray light, which in turn increases image definition and contrast. (Fig.

24)

2 } Turning the field d'laphragm ring

{Fig. 19} counterclockwise reduces

the diaphragm opening, or reverse the ring to increase the opening.

Tension adjustment of the coarse adjustment knobs

') A tension adjustment ring

(J~

is provided next

the coarse adjustment

knob. With this device the tension of the coarse adjustment is freely ad-

justable for either heavy or light movement, depending upon operator

preference. (Fig. 25)

Applying the tip of a large screwdriver at a groove in the periphery of

the

tension adjustment ring

CD,

rotate the ring in the direction of the

arrow to increase the tension, or reverse the ring to loosen.

2) However, do not Icosen the tension adjustment ring too much, because

this may cause the stage

drop or the fine adjustment knobs to slip.

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