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Adjusting Lens Focus and Inserting a Filter
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3.3.2 Inserting a Filter
MOBOTIX offers a polarization filter and a long-pass filter (LPF) in its range of accessory
products for all sensor modules (except the L12). The polarization filter prevents unwanted
reflections from smooth surfaces. The filter can be used to provide better facial recognition
of the people behind the windshield of a car, for example. The long-pass filter, together
with an infrared lamp, provides the basis for optimal license plate recognition in all light-
ing conditions. Only one filter can be used per sensor module, which then replaces the
standard protective glass lens.
Procedure
1. Position the blue lens wrench on the notches of the
protective glass lens. Rotate the wrench
to the left
until you feel a stop (max. 300°) and then a little
bit further until the protective glass lens slides out
of the sensor module.
2. If required, clean the inside of the filter using a
clean, lint-free cotton cloth.
3. Place the filter on the notches of the blue lens
wrench.
4. Position the filter with its clips over the two recep-
tacles on the sensor module (red arrow on the
image in the margin) and firmly press onto the
sensor module. Rotate the glass
to the right
using
the blue lens wrench until you feel a stop.
5. Adjust the
polarization filter
according to the camera’s live image on the computer
monitor. Rotate the filter to the left using the blue lens wrench until you reach the
desired setting (maximum 180°).
6. To readjust the polarization filter, rotate it back
to the right
until you feel a stop and
repeat step 4.
7. If required, clean the outside of the filter using a clean, lint-free cotton cloth.
Note
Note that using the
polarization filter
reduces the amount of light that enters the lens
by approximately 50%.
M.7
