Depth Of Field Scale - Leica SUMMARIT-M 1:2,4/75mm Instructions Manual

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), a fixed ring (6) with index for focusing
(6a), a depth of field scale (6b), and a red alignment button for lens change (6c).
In addition, the front mount of the Leica Summarit-M 75mm f/2.4 has an
external thread (2c) for attaching the lens hood.
A 6-bit lens identification bar code (7) is located on the bayonet flange. It relays
lens data to the camera body for calibration of the exposure metering system of
digital Leica M models and for lens type-specific optimization of the image data.
FOCUSING
The lens is focused by rotating the distance-setting ring (5).

DEPTH OF FIELD SCALE

The scale (6b) on the fixed ring (6) shows the range of the depth of field for the
set distance. The ranges are indicated by the sections of the lines marked with
the f stops.
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