Adjusting the condenser
Adjust the aperture diaphragm lever
![Adjust the aperture diaphragm lever](../images/page/condenser/condenser-1.jpg)
- Set the aperture diaphram lever of the condenser lens to "the same value as the magnification of the objective lens".
![Adjust the aperture diaphragm lever](../images/page/condenser/condenser-2.jpg)
- By doing this, the aperture diaphragm will limit to 70 to 80% of the objective's numerical aperture, allowing sufficient contrast.