Pyramid Imaging EXO Series, Manual

Page: 95 / 135

SVS-VISTEK
Feature-Set 95
Image Impact of IR Cut Filter
As a reason of chromatic aberration limiting the spectral bandwidth of the
light always results in sharper images.
Without an IR cut filter:
>
Monochrome sensor images get muddy.
> Chroma sensor images get influenced by a greater amount of red
than you would see with your eyes. White balance gets much more
difficult. Contrasts get lost because of IR light influencing also blue
and green pixels.
SVS-VISTEK recommends IR cut filter for high demands on color or
sharpness whether monochrome or color sensors.
Spectral Impact of IR Cut Filters
IR cut filter do influence the spectral sensitivity of the sensor. The spectral
graph below shows the wavelength relative impact of the SVS-VISTEK
standard filter.
Figure 61: IR cut filter light transmission
Focal Impact of Filters
As an IR cut filter mainly consist of a small layer of glass (1 mm thick)
there is an impact on the flange focal distance. Refraction within the layer
cause shortening this distance.
When ordering a standard camera with an extra IR cut filter you might
have to compensate the focal length with an extra ring. Please refer to
Pyramid Imaging for more detailed information on your camera
behaving on C-Mount integrated filters.
As BlackLine models have an IR cut filter by default, the focal distance is
compensated by default too.
NOTICE
Removing the IR cut filter lengthen the focal distance and
will invalidate the warranty of your camera.