Zenit PhotoSniper User Manual - page 11
Zenit PhotoSniper User manual, 1992 year
– 11 –
6.2. Accessories
6.2.1. Light filters
The complete photogun set includes five light filters:
Yellow filter Y-2
x
is widely used in landscape photography;improves right colour condition of blue,
green and yellow objects; emphasizes clouds and increases contrast of shadows and remote objects;
eliminates the effect of atmospheric haze.
Colourless filter UV-1
x
eliminates the influence of ultraviolet rays (for instance, in high-mountain
conditions) in black-and-white and especially in colour photography.
Light yellow filter Y-1.4
x
improves rendition of visual brightness correlations of blue, green and
yellow objects in portraiture with natural illumination, in photographing landscapes under clouded
blue sky and the evening illumination when operating at brief exposure times.
Orange filter O-2.8
x
is used in taking pictures of remote objects when it is necessary to reduce the
effect of atmospheric haze; it increases the contrast of such objects. In usual photography the sky in the
photograph is very dark and clouds are bold.
Yellow-green filter YG-2
x
is of especial value for correct colour rendition (in particular, of red and
green colours) on panchromatic films. The filter is used in portraiture both by day and artificial light,
in artistic and technical photography of paintings and colour pictures.
FILTER FACTOR TABLE
(by day light)
Films
Light filters
UV-1
x
Y-1.4
x
Y-2
x
O-2.8
x
YG-2
x
Filter factor
Isopanchromatic
1
1.5
1.5-2
2.5
1.5
Panchromatic
1
1.5
1.5-2
2.5
4
Note.
Filter factor is the ratio of the exposure time used when photographing with a light filter to the
one required when photographing without a light filter (illuminating conditions are the same).
6.2.2. Cassettes
The camera set comprises three film cassettes. One cassette is placed in the camera and two
others are fastened on the case cover.
6.2.3. Screw-drivers
Sometimes, when “hunting” with the photogun, simple adjustment can be needed. To this end
the camera set comprises two screw-drivers (4 mm and 1.7 mm) attached to the case cover.
7. Care of the Camera
The photogun should be handled carefully, should be kept clean and protect from mechanical damages,
moisture and sharp temperature fluctuations.
Keep the photogun in a closed case. In such cases the diaphragm of the TAIR-3-PhS lens should be
set at “22”, the diaphragm setting knob, the shutter and the self-timer be released.
Never remove the lens from the camera (unless you need it) to prevent dust and dirt from getting
on the surface of optical parts.
Clean the optical coated lens surfaces only from outside with a clean soft piece of fabric or cotton,
slightly moistened with rectified alcohol, ether (petroleum or sulfuric) or, if these means are absent,
with toilet eau-de-Cologne.
As the photogun is a complex optical mechanical device, any repair of the camera and its
adjustment should be performed by a highly qualified specialist.
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