The Aperture Ring - Leica M7 Bedienungsanleitung

The aperture ring

The aperture values are standarised world-wide.
They are selected such that the amount of light
reaching the film is always halved when the lens is
stopped down between two successive apertures
(stops) One stop corresponds to one value on the
shutter speed dial (11).
As for the shutter speeds for manual setting, the
aperture ring (19) engages perceptibly at each full
stop (and on most lenses also at half stops). With
a little practice, you will also be able to set the
apertures in the dark.
The direction in which the aperture ring turns
(like that of the shutter speed dial) corresponds to
the exposure meter displays in the viewfinder for
manual setting.
For example, if the left-hand triangular LED lights
up, turning the dial in the direction of the arrow,
i.e. to the right, leads to the slower shutter speed
required.
For more details on setting the correct exposure,
see the section: "Exposure metering" on page 96.
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