VOIGTLANDER BESSA-L, Инструкция по эксплуатации

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Depth-of-field
1. When you are focusing on a given subject, objects in the fore-
ground and background will appear acceptably sharp in the pic-
ture. The range in which all objects appear acceptably sharp in
the picture is called "depth-of-field."
2. To obtain the depth-of-field range at different aperture settings,
the depth-of-field scale is used.
The distance covered by the range between pairs of the same
f/stops on the depth-of-field scale as the f/value used is the
depth-of-field. To obtain the actual distance values of the
depth-of-field, read the values within the range of the focusing
scale.
3. For instance, when the lens is focused on a subject at a dis-
tance of 1 m with the aperture set at f/8 the depth-of-field can be
obtained by using the depth-of-field scale as follows: the values
on the distance scale corresponding with the f/values shown on
the depth-of-field scale are approximately 0.5m and infinity
respectively. This means that all objects within the range
between 0.5m and infinity distance can be reproduced accept-
ably sharp in the picture with the aperture set at f/8.