Celestron 44100 Manuel De L'utilisateur page 12

Adjusting the Lighting
Specimens of different size, thickness, and color variations will require different levels of illumination. There are two ways to
change the amount of illumination when viewing a specimen; adjusting the Abbe condenser and adjusting the iris diaphragm
(see Figure 3f):
1. When viewing with lower power (4x and 10x) objective lenses you will need to lower the condenser lens in order to
spread the light over the larger field of view. To change the position of the condenser, simply rotate the condenser
regulator knob clockwise until the beam of light spreads wide enough to illuminate the entire field of view when viewing.
2. As you lower the condenser to spread out the light or change to a higher power objective lens, your image will appear
dimmer. Open the aperture of the iris diaphragm to let in more light. Opening and closing the diaphragm will give
a relief view of the specimen and allow you to change the depth of field of the specimen being viewed.
Using a Filter
To bring out different levels of detail, experiment with changing the color of the back lighting of the specimen. To change the
lighting color, place the blue filter in the light path by placing it on the top of the electric illuminator. You may need to refocus by
adjusting the fine focus knob (11) slightly for best viewing.
Replacing the Electric Illuminator Bulb
Figure 3g
12 I ENGLISH
To replace a burned out bulb, do the following:
1. Take out the thumbscrew on the illuminator by turning it
counter clockwise.
2. Open the compartment and you will see the 20 watt
tungsten bulb.
3. Remove the bulb by pressing lightly down on the bulb
and rotate it counter clockwise and it will come out.
4. Take the new bulb and line up the pins of the bulb with
the slots in the bulb socket and then push it down and
rotate clockwise until it sets in place.
5. Close the compartment, line up the threaded hole for
the thumbscrew and tighten it by turning clockwise.