Focusing - Princeton Instruments PI-MAX 3 System Manual

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Should the camera be mounted in the nose-up position beneath a table, take care to
protect the mounting components from lateral stresses, such as might occur should
someone accidentally bump the camera with a knee while working at the table. One
solution to this problem would be to install a barrier between the camera and operator to
prevent any accidental contact.
There are no special constraints on nose-down operation. Again, however, good operating
practice might make it advisable to take steps to prevent accidental contact from unduly
stressing the mounting components.
Always begin with the lens stopped all the way down (largest f/ stop number) to
WARNING
minimize the risk of overloading the intensifier.

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.
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PI-MAX 3 System Manual Version 1.A