Infrared Cut-Off Filters
Color camera cased models are equipped with an additional infrared (IR) cut-off filter. This filter can reduce sensitivity in the near infrared spectrum and help prevent smearing. The properties of this filter are illustrated in the results below.
IR filter transmittance graph
|T=50%||680 nm ±10 nm|
|T>80%||400 nm - 420 nm|
|T>85%||420 nm - 650 nm|
|T average 1%||750 nm - 1100 nm|
|T<3%||750 nm - 1100 nm|
In monochrome cased models, the IR filter is replaced with a transparent piece of glass.
The following are the properties of the IR filter/protective glass:
|1" and 1/1.2" Sensors||All Other Sensors|
|Material||Schott B270||Schott B270|
|Dimensions||15.5 ±0.08 x 18 ±0.08 mm
||14 ±0.08 x 14 ±0.08 mm
|Thickness||1 ±0.07 mm||1 ±0.07 mm|
For more information, see Dust Protection.
|Removing the IR filter from a color camera|