Bosch EX30 Installation Instructions Manual page 18

Telephoto (Factory standard)
Wide
Use a Neutral Density filter or Infra-Red Pass filter to cover
the lens during focusing to simulate low light conditions on
scene for correct 24-hour focusing. For camera with vari-
focal lens, the camera should be focused with the lens iris
fully opened to simulate the worst possible depth of field.
Using a Neutral Density filter or Infra-Red Pass filter will
ensure the iris is fully open for correct setup and
adjustment.
Note that statement above is applicable only for Day/Night
or IR version cameras.
Use 40º illumination beam
Use 80ºillumination beam
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