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For a camera illuminated by a monochromatic lambertian source (that can be a secondary light source as for instance an object diffusing the light emitted by a primary light source) through an optical system, calculates the optical power on a pixel and various related signal over noise ratios as functions of the wavelength, the position and radiance of the light source, the aperture diameter and magnification of the optical system, the quantum efficiency, dark current, readout noise, full well capacity, maximum exposure time and pixel size of the camera. The sensitive area of the camera is conjugated with the light source. It is supposed that there is no aberration : the optical system is considered to be perfect (working as a paraxial optical system). Also, the pixel is considered to be sufficiently small. This means that the element of light source conjugated with the pixel has negligeable dimensions regarding its distance to the aperture