Bedienungsanleitung Celestron 44127 Cosmos (Seite 3 von 20) (Deutsch, Englisch, Französisch, Italienisch, Spanisch)

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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 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 (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

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 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.

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 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.

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 6aFigure 6b

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