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Most photographic subjects contain details of varied brightness. The light reflected by this type of subject has a mean grey value of 18%, i.e. it is the same as that of a standard grey area that reflects 18% of the light it receives. This is the calibration value for all exposure meters.
The
Selective mode
This is the method of choice with high- contrast subjects that have a wide brightness range and correct exposure of a certain detail is particularly important.
The large central circle in the viewfinder indicates the field covered in this mode, in which the exposure meter measures only the light reflected by the exact area of the subject that you want determine the expo- sure. The field is the same size on all focusing screens and for all lenses, whatever their focal length, and is clearly marked in the viewfinder. For selective mode, choose programs A and m .
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