Optica B-1000 Manual De Instrucciones página 10

3.0 USING THE MICROSCOPE
3.13 Darkfield condenser (optional)
For darkfield observation, the Abbe condenser in standard equipment must be replaced
with a special condenser for darkfield, as showed in the picture.
3.14 Control keyboard
B-1000 illumination can be managed through the keyboard placed on the left of the stand:
1) ON/OFF
3) AUTO-OFF
4) MEM
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2) BOOST
5) AUTO