Leica R6 Instructions Manual page 18

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Full-field integral mode
Most photographic subjects contain details
of varied brightness. The light reflection of
this type of subject corresponds to a mean
grey value of 18 0/0. This is the calibration
value for all exposure meters.
The full-field integral mode is suitable for
all subjects in normal light, when there are
no extremes of light or colour, and where
the light and dark areas are fairly evenly
distributed over the entire field.
Selective mode
This is the method of choice if the bright-
ness range of the subject is very large.
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 should determine the
exposure. 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.
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