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Location Lighting for Television by Alan Bermingham

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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.

image

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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