BX-RLA2
8
6. Open the field iris so that its image is almost the same size as (i.e. sub-
scribes) the field of view.
Using the Field Iris Diaphragm
{In
reflected light brightfield observation
The field iris diaphragm adjusts the illuminated area to obtain an image
with high contrast.
According to the objective in use, adjust the FS knob ² of the reflected
light illuminator until the iris image circumscribes the field of view to block
unnecessary light.
{In
reflected light darkfield observation
The field iris must be opened by pushing in the FS knob ².
Field iris diaphragm image
Field of view of eyepiece
