4. Performing the centering procedure

Basics

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Raise the condenser to the upper-most position by turning the knob.

Stop down the aperture until the field iris diaphragm image enters the field of view by turning the field iris diaphragm ring in the direction indicated by the arrow.

Bring the field iris diaphragm image into focus by turning the knob.

Move the field iris diaphragm image to the center of the field of view by turning the centering screws.

Gradually open the field iris diaphragm until the field iris diaphragm image is just within the field of view.

Further open the field iris diaphragm so that it is slightly outside the field of view.

 

 

 

 

 

The field iris diaphragm must surround the field of view to prevent unwanted stray light from deteriorating the image.

 

 

 

 

 

 

 

 

 

 

 

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