When it is possible to photograph objects of considerable depth or a
number of objects at different distances, reference to the depth of field
scale which will cover objects at both positions. After focusing, this scale
shows the limits of the depth of field for the diaphragm scale setting
used. The depth field ranges from the diaphragm scale figure on one side
of the indicator to the same on the other. For instance, suppose the lens is
focused for a distance of 4 m with a diaphragm setting of 16. Then the
image will be sufficiently sharp between 2 m and infinity. With the same
focus setting for distance of 4 m but with a diaphragm figure of 5.6, the
image will be sufficiently sharp between 3 and 7 m.
The flash synchronizing mechanism with its scale, having a range of 0 to
25 millisec., permits photographing with flash bulbs of any type. The
bulb is connected to the camera by means of the socket 14. An
illuminating single-flash bulb device is fixed to the bottom cover of the
camera by means of the bracket and the tripod screw. Flash bulbs of
different types differ in the flash duration necessary to produce light
approximately to one half of the bulb peak after the switch closes. This
value (in millisec.), usually determined from the bulb certificate, should
be set on the synchronization scale 17 by turning the lever 16 until the
lever index is opposite the corresponding division of the scale.
Fig. 4.
18 -- objective fastening ring; 25 -- camera tripod nut; 26 -- latch; 27 --
eyelets; 28 -- latch ring
When photographing with a multi-flash impulse bulb it must be
remembered that its lag equals practically zero. Therefore, when using a
bulb on this kind, the lever 16 should be set at "0". The illuminator of a
multi-flash impulse bulb is usually fastened to the tripod nut of the
camera, but may also set up at same distance, depending on the length of
the conductor connecting the impulse device with socket 14 on the
camera.
The use of the flash bulbs is possible only with exposure speeds of 1/25
sec. and "B". "B" exposure are usually undesirable when using flash
bulbs, as during long exposures a large amount of light enters the camera,
which may result in a double image.
The camera is fixed in its case or on a tripod without its case by means of
nut 25 (
Fig. 4) in the bottom cover, having a standard 3/8" thread.
The bottom cover is also provided with latch 26 for locking the cover and
(14 pages)
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