FED 5B Instructions for Use, 1992
– 5 –
When photographing the remote subjects or if
the distance to the subject to be photographed is
known the lens may be focused by the distance
scale.
In case of photographing the objects having a
considerable extension to the depth or when
shooting a series of subjects located at different
distances from the camera, determine the value
of the necessary diaphragm with the aid of the
depth-of-field scale and diaphragm the lens by
setting diaphragm scale
21
in the required
position relative to the index.
Depth-of-field scale
22
consists of two rows
of numbers corresponding to the lens diaphragm
scale and disposed symmetrically relative to
distance scale index
24
.
When the lens is being focused, the depth-of-
field scale shows on the distance scale the
shortest and longest distances from the camera
within which the image sharpness will be
satisfactory for each diaphragm value chosen in
shooting.
For example, in Fig. 10 you can see that
when the lens is focused at a distance of 3 m, the
diaphragm being 5.6, all the subjects located at a
distance of 2.5 to 4 m from the camera will be
sharply photographed. When the diaphragm is
equal to 8 the subjects located from 2.2 to 5 m
from the camera are sharply photographed on
the picture and so on.
Determine the shutter speed required for
shooting. You can easily do it with the aid of a
pocket exposure meter or exposure metering
tables.
To protect the lens from the overhead-and
-
side light it is good practice to put a sunshade
on the lens in shooting.
Having determined the value of the required
exposure, raise slightly exposure head
11
(Fig.
11), turn it till the index registers with the
chosen value on exposure scale
12
and lower it,
in this case the head should be fixed in the set
position.
In Fig. 11 the head is set at the exposure
(shutter speed) of 1/30 s.
The exposure can be set only with the shutter
cocked. Do not turn the exposure head in the
interval between “30” and “1”.
Digits on scale 12 correspond to shutter
speeds of 1, 1/2, 1/4, 1/8, 1/15, 1/30, 1/60,
1/125, 1/250 and 1/500 s.
The dot between digits “1” and “4” on the
exposure limb corresponds to the shutter speed
Fig. 8
Fig. 9
Fig. 10
21 — diphragm scale;
22 — depth-of-field scale;
23 — distance scale;
24 — distance scale index.
