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9
IR-cut or AR filter
All camera models have by default either an IR-cut filter (color camera) or an AR (anti-reflective) filter
(BW/IR camera) mounted on top of the sensor.
Taverage ≥ 92% 420nm 620nm
Tmin
≥ 88% 420nm 620nm
T
= 50% 650nm ± 10nm
Taverage ≤ 5%
690nm 1100nm
Figure 8:
IR cut filter characteristics for color cameras
Tave.
≥ 97% 420nm 680nm
Tabsn ≥ 92% 420nm 680nm
Figure 9:
AR filter characteristics for BW/IR cameras
Removing the filter
The C-mount flange distance from the sensor is adjusted for the use of either filter. Removing the filter
will decrease the length of the optical path and changed the optical properties. This will make a
readjustment necessary and in some cases it might become impossible to focus properly.