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FED 4
The camera exposure meter allows to quickly
and faithlessly find the exposure and diaphragm
values which are most favourable for taking
pictures under the given conditions.
The basic components of the exposure meter
are: a photocell, the galvanometer and a
calculator.
The necessary exposure is found with the
help of the calculator,
The calculator consists of three disks the first
of which represents a drive of fixing pointer and
has a shutter speed scale from
Black figures stand for parts of the second, red
ones — for whole seconds.
Dial 3 is fitted with a diaphragm scale and a
scale of film sensitivity represented in GOST
units. The central stationary disk is equipped
with an indicator.
Nearby in the aperture the fixing pointer and
the galvanometer pointer are seen.
Prior to setting the necessary shutter speed
place the sensitivity value of the film loaded in
the camera on the scale opposite to the index.
Then aim the camera at the object to be
photographed and by turning the shutter speed
dial clockwise or counterclockwise make fixing
pointer 5 coincide with galvanometer pointer 4
as it is shown in the Fig. Then find the reading
of the calculator which is at the point of
intersection of the strokes of the shutter speed
scale and that of the diaphragm scale within the
interval from 2.8 to 16.
It should be noticed that any of these
combinations gives the same exposure and is
used
according
to
conditions.
In the adjacent picture such
combinations are:
shutter speed 1/125 sec — diaphragm 2.8
1
correspondingly
/
60
1
— 11; ¼ — 16.
/
8
It should be kept in mind that the exposure
meter is affected by the mean brightness of the
objects to be photographed. In case the area of
the object which is important from the point of
view of the plot occupies a small part of the
frame and its brightness considerably differs,
you should better find the exposure value
standing in the immediate vicinity of the object
to be photographed, i. e. at a distance of 30—40
cm.
Protect the aperture of the photoelectric
exposure meter from immediate rays of
powerful light sources, otherwise it may result
1
/
to 8 sec.
500
concrete
photography
— 4;
1
— 5.6;
1
/
/
30
15
— 8;
– 6 –
User Manual
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