Nikon DIAPHOT 300 - Adjusting Brightness.17

2. Adjusting Brightness
Control the lamp voltage or use the ND filters to adjust the brightness.
1) Brightness adjustment by controlling the lamp voltage
Two light intensity control dials are available: one on the front panel of the power
supply unit, the other on the left side of the microscope base. Either of them
can be used for brightness control.
Connect the microscope and power supply unit with the ex-control cable, and set
the light intensity control dial on the power supply unit to CTRL. Now, light
intensity can be adjusted with the light intensity control dial on the microscope
body.
• If the light intensity control dial on the power supply unit is not set to CTRL, the
light intensity control dial on the microscope body does not function.
• The light intensity control dial on the power supply unit and that on the
microscope provide slightly different light intensity at the same readings.
• As the lamp voltage is changed, the color temperature also varies, which
results in blueish hues if the dial volume is set to high numbers and reddish
hue if set to low. For photomicrography using daylight type color film, be sure
to set the lamp voltage to PHOTO or around 9 and bring the NCB1 1 filter into
the optical path for the best color balance. (See page 20.)
• For photomicrography using tungsten type color film, set the lamp voltage to 8
and keep the NCB1 1 filter away from the optical path.
• For photomicrography using monochrome film, set the lamp voltage to 6 or
higher and keep the NCB1 1 filter away from the optical path.
• Normally, adjust the lamp voltage between 6 and 12.
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