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2.3 Light source for transmitted light imaging
The black round button labeled “HAL” for the halogen light source is on the right side of the
microscope (Figure 3, arrow 1). Voltage of the halogen light can be adjusted with a knob (Figure 3,
arrow 2). Remember that while the change of the voltage changes the intensity of the light, it also
changes the color: a hot lamp burns bright and blue; a cool lamp burns dim and red. With neutral-
density filters it is possible to adjust light intensity without changing the color temperature. There
are two neutral-density filter wheels (Figure 3, arrow 3) that can be combined.
Figure 3. Power supply of the halogen lamp.
2.4 Axiocam HRc camera
Turn the camera on by plugging the power cable in (Figure 4). Green light indicates that the camera
is on. Alternating green and red lights means that imaging is in progress.
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