Resolution and contrast generation - Sample illumination by a condenser lens

3 important questions on Resolution and contrast generation - Sample illumination by a condenser lens

Closing the condenser aperture...

Decreases illumination angles, decreasing the effective N.A.

How is Köhler illumination done?

By focussing the light source with an additional lens in the focal plane of the condenser lens

But if the condenser aperture is fully opened...

This results in stray light.

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