3. Press the principal switch (9) to an ON position “I”.
4. Press the incident illumination (22) or transmitted illumination (23) or both at the same time
“I” or “II”, according to your needs in observing the sample.
5. Light intensity should be adjusted according to the objective used, or the type of sample
observed.
6. The angle of incident illumination can be adjusted by using the adjustment screw (8) that can
be used to vary the orientation of the lens.
B. Interpupillary
adjustment.
1. Looking through the eyepiece (1), move the eyepiece tubes (3) by taking hold of the prism
housing (4) and moving out, or inwards.
2. Interpupillary distance is correct when the two fields of view viewed through both eyepieces
appear complete, and are unified into one.
3. Interpupillary distance should be adjusted for each new user.
C. Focussing
1. Turn the zoom knob (16) to the lowest magnification 1X.
2. Place a flat object or a microscope slide on the centre of the stage (11).
3. Turn focussing knobs (18) to mid-focus range.
4. The head holder (17) is mounted on a column (21), on which it can be moved up or down,
depending on the size of the object to be focussed on.
a. Support head holder (17) with one hand without touching any lens, and with the
other, loosen the screw (20) on the support collar (19). The head holder can then
be slid to the base (13).
b. Without letting go of the head, loosen the head holder locking screw. (Fig. 1).
c. While looking through the eyepiece, move the head holder up or down until the
object appears in focus.
d. Tighten the head holder locking screw. Do not let go of the head yet.
e. Slide the security collar up to the head holder, and tighten the support collar
screw. The head can then be released.
f. It is not necessary to adjust the head every time the sample is changed, only
when it appears out of focus.
5. Adjust the focus knobs, (18) until the image appears sharp.
D. Diopter
adjustment.
Diopter adjustment collars are located on the eyepiece tubes. Their normal position is when the
lower part of the collar is aligned with the sign marked on the eyepiece tube.
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