Nikon LABOPHOT-POL Manuel d'instructions - Page 12

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In every case use the CF objectives in com-

bination with the CF eyepieces.

(1) Oil immersion objectives (Oil)

•

Objective CF Achromat

P 100x

(Oil), an

oil-immersion type, is to be immersed in oil

between the specimen and front

of the

objective.

To see if air bubbles are present in the im-

mersion oil, which deteriorate

the image

quality,

pull out the eyepiece from the

eyepiece tube to examine the objective exit

pupil inside the tube. To remove air bub-

bles, revolve the nosepiece slightly to and

fro several times, apply additional

oil, or

replace the oil. Be careful not to rotate the

nosepiece too far as to soil the ends of the

other objectives with oil.

•

To clean off the oil, pass lens tissue or soft

cloth moistened with xylene lightly two or

three times over the lens. It is essential at

this time to avoid touching the lens with

the part of tissue or cloth once used.

(2) Coverglass

•

With the objectives engraved "160/0.17",

use a coverglass of O.17mm in thickness.

•

The indication

"160/-"

on the objective

means that no matter whether a coverglass

is used or not, no decrease of image defini-

tion or of contrast will result.

6) Eyepieces

•

To take full advantage of the CF eyepieces,

use them

in combination

with

the CF

objectives.

•

By inserting the eyepiece with cross lines

and graduation

(CFW 1OXCM) into the

eyepiece sleeve fitting

the protractor

into

the right-hand

side groove of the

sleeve, the a-direction of the analyzer and

dia-polarizer are al igned with the cross lines

direction.

If the protractor

pin is fitted to the upper

right side groove of the sleeve, the cross

lines will be aligned with the diagonal posi-

tion of the polarizaiton.

•

CF PL Projection

lenses are exclusively

designed for photom icrography.

Do not

use them for observation.

•

For focusing with the observation tube of

the trinocular

eyepiece tube for photo-

micrography,

use the eyepiece incorporat-

ing the photo mask.

7) Achromat strain-free condenser

•

The top lens of the condenser is to be

placed in the optical path for the ortho-

scopic and conoscopic microscopy provid-

ed that

it is to be swung out when an

objective of 4X or lower magnification

in use.

[Note]

For the orthoscopic

microscopy,

a lower numerical aperture illumi-

nation with the top lens swung in

condenser was used to be recom-

mended, however, th is method is

not effective

especially for high

magnification

observation because

of the lowered resolution. Hence,

for the latter case, use of the top

lens may rather be recommend-

able except the retardation

mea-

surement or the interference color

observation for wh ich it is neces-

sary to

make the

illumination

light flux as parallel as possible to

the optical

axis by swinging out

the top lens or stopping down the

aperture diaphragm.

•

Thickness of the glass slide must be 1.7mm

less, otherwise,

the field

diaphragm

might fail to focus its image on the speci-

men.

8) Bertrand lens

(with the trinocular eyepiece tube "TP" or

the binocular eyepiece tube "BP" in use)

•

Bring the Bertrand

lens into the optical

path by turning

the Bertrand

lens ring

leftward to observe the conoscopic image.

(Fig. 16)

Bertrand lens

flip-in/out

ring

Fig. 16