202 PI-MAX/PI-MAX2 System Manual Version 5.F
Focusing
There is no difference between focusing considerations for an F-mount lens and a
C-mount lens. Simply rotate the lens-focusing ring for the sharpest observed image. The
lens will show maximum focus sensitivity at full aperture (lowest f-stop setting). Once
the point of optimum focus is obtained, you may wish to adjust the lens aperture to f/8 or
f/11, that is, somewhere near mid-range aperture, where the lens will probably be sharper
than it is with the lens aperture completely open. Some readjustment of the Exposure
Time may be required to achieve the most pleasing image. In microscopy applications, it
will also be necessary to review the discussions in Chapter 12.
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