Celestron 44121 Gebruiksaanwijzing - Pagina 3
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FOCUSING & CHANGING POWER (MAGNIFICATION)
Now that the specimen slide (or object) is placed directly
under the objective lens, use the focus knob Fig. 1 (9) to
focus on the specimen. Note: For very small objects, you
should set them on the clear slide with a recessed hold in
the center.
1. Always start with the lowest power (4x objective lens) and
have the zoom eyepiece at the 10x position, all the way
counterclockwise (when you are facing the microscope
from the front) until it stops, so that the total power is 40x
– this is the most useful power for solid objects.
2. For slightly higher power, you can rotate the knurled ring
on the zoom eyepiece (see Figure 5) clockwise to obtain
powers of 40x to 80x (or anywhere in between) as you
continue rotating to the 20x eyepiece position. Note
that you will have to refocus whenever you rotate the
eyepiece to obtain a sharp focus.
3. For much higher powers, you will have to rotate the
nosepiece Fig. 1 (5) to change the objective lens to 15x
(provides total power of 150x to 300x depending on what
position you have the zoom eyepiece in or 30x provides
total power of 300x to 600x). You rotate the nosepiece
by holding the microscope above the nosepiece with
one hand and rotating the nosepiece with the other hand
until it clicks at the position. Be cautious not to let the
objective lens touch the specimen slide or object when
changing to higher powers. You should turn the focus
knob first to lower the stage to a low position. Note: The
power range of the objective lens you are using is shown
on the nosepiece after it clicks into position.
4. At the highest powers, your views will be greatly
magnified, but somewhat darker. The most enjoyable
views can be at the lower powers, which have a wider
field of view and brighter illumination.
F
6
IGURE
A
ILLUMINATION
To get the sharpest and best views, the illumination
(lighting) will have to be adjusted.
1. The top illuminator Fig. 1 (3) is used only for solid
objects (not specimen slides) so that light shines down
onto the object. Push the button on the top of the
illuminator to turn it on/off. After some usage, you can
determine the best way of adjusting the light to provide
the most pleasant views.
2. The bottom illuminator Fig. 1 (10) is used for specimen
slides. The light shines up through the hole in the
stage through the slide. You can see a close up of the
illuminator in Figure 6
on by rotating it so the light goes up through the hole.
You turn off the illuminator by rotating it down so that
the mirror is on the upper part (the mirror is not useful
with this microscope since you have the much better
electric illuminator).
3. The light from the bottom illuminator can be increased
or decreased by rotating it with very slight movements.
4. The bottom illumination may be too bright with some
specimen slides. Included with your microscope is a
light diffuser, which reduces the brightness and glare
somewhat and can make the views sharper with a higher
contrast level. In Figure 6
piece. The diffuser fits over the bulb area by press fitting
it on. Figure 6
shows what the illuminator looks like
B
with the light diffuser in place. It will take experimenting
to get this right.
F
IGURE
3
below. The illuminator is turned
A
, the diffuser is the small black
A
6
B