Celestron Microscope Kit Manuál s instrukcemi stáhnout pdf (Strana 3)

Figure 4a Figure 4b Figure 5

Focusing & changing power (MagniFication)

Now that the specimen slide (or object) is placed directly

under the objective lens, use the focus knob Fig. 1 (8) to

focus on the specimen. Note that 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 (3) 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 rotate 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 rst

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.

illuMination

To get the sharpest and best views, the illumination

(lighting) will have to be adjusted.

1. The top illuminator Fig. 1 (11) 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

pen light illuminator to turn it on/off. You can change

the brightness by moving the illuminator up/down or

by rotating it left or right. 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 (6) is used for specimen

slides which shine up through the hole in the stage

through the slide. You can see a close up of the

illuminator in Figure 6a below. The illuminator is turned

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.

As with the top illuminator, you will have to experiment

to provide the best lighting for the best views.

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 6a the diffuser is the small black

piece. The diffuser ﬁts over the bulb area by press ﬁtting

it on. Figure 6b shows what the illuminator looks like

with the light diffuser in place. It will take experimenting

to get this right.

Figure 6a Figure 6b

time centering. Read the sections below on Focusing,

Changing Power, and Illumination before proceeding.

You are now ready to focus and view the specimen, but ﬁrst

you must take some precautions so you do not damage a

specimen slide or valuable object. When using the higher

powers while you are focusing, make sure that the objective

lens does not hit the slide or object being viewed.

1 2 3 4 5 6 7 8 ... 19 20

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