2021-11-08
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IDS NXT: Technical manual IDS NXT rome
10 Filter glasses
10.1 Filter types
Every camera has a filter glass in the front flange to prevent the entry of dust particles. Color cameras by
default use an IR cut filter (type HQ), which is required to ensure correct color rendering. For monochrome
cameras, the standard filter is a glass filter (type GL). Every camera model is available with different filter
variants such as daylight cut filters (type DL). The filter type is given at the end of the model name.
The following table shows an overview of the different optical filters used in IDS cameras:
Filter type
Name
Refractive
index
(n
Filter
)
Glass type
Thickness
(f)
Cut-on
wavelength
Cut-off
wavelength
Non-
reflective
IR cut filter
HQ
1.53
D263
1 mm
-
650 ±10 nm On one side
Glass
GL
1.53
D263T
1 mm
330 nm
-
On both
sides
Daylight cut
filter
DL
1.53
RG695
1 mm
695 nm
-
-
You can tell the filter type from the outside by its coloration:
·
Reddish glass: HQ filter
·
Plain glass: GL filter
·
Opaque glass: DL filter
All sensors have a cover glass. The transmission of the cover glass is taken into account in
the camera data sheet.
