Leica NOCTILUX-M 1:0,95/50 mm ASPH. Notice D'utilisation page 21

DEsIGN OF LEIca M-LENsEs
All Leica M-lenses are basically of the same design. There are: an aperture setting
ring (4), a distance setting ring (5), and a fixed ring (6) with an index for focusing
(6a), a depth of field scale (6b), and a red alignment button for lens change (6c).
Furthermore, the LEICA NOCTILUX-M 50 mm f/0.95 ASPH. is equipped with a built-
in telescopic lens hood (2).
A 6 bit lens identification bar code (7) is situated on the bayonet flange. It relays
lens data to the camera body so the exposure metering system of digital Leica M
models can be calibrated. The information is also used to custom-optimize image
data according to the respective lens.
FOcusING
The lens is focused by rotating the distance-setting ring (5).
DEpTh OF FIELD scaLE
The scale on the fixed ring (6) shows the range of the depth of field for the set
distance. The ranges are indicated by the correspondingly marked lines.
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