7
Camera Sensitivity – How Much Light do We Need?
7.1 Defining Sensitivity
Camera sensitivity links three interrelated parameters, namely lens aperture (f-number), illuminance (lux) and signal-to-noise ratio (dB). This is illustrated in Figure 7.1.
Figure 7.1 Camera sensitivity ‘triangle’
Camera manufacturers use a standard light source and line-up chart which equates to an illuminance of 2000 lux and a peak white reflectance of 89.9%. The variables in the test are the lens aperture and the signal-to-noise ratio, both of these will depend on the CCD sensitivity and the amount of camera gain required.
A typical CCD camera sensitivity would be: ...
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