Camera model
A model of pointed cameras supplied with a video surveillance kit. Knowing this data, you can find detailed information on the cameras and clarify their characteristics. Also, if you buy additional cameras of the same model, you don't have to worry about compatibility.
Matrix size
The physical size of the sensor in the pointed cameras is diagonally, in inches (fractions of an inch).
The larger the sensor, the less prone it is to noise, the better image quality it can provide, and the better it is suited to low light conditions. This is due to the fact that each individual pixel gets more light, because. on a large matrix and individual dots are larger. On the other hand, large matrices are more expensive.
Focal length
Focal length of the lens of pointed cameras included in the set.
The focal length is the distance between the lens and the matrix, at which the image on the sensor is as clear as possible (when the lens is focused to infinity). This indicator directly affects the viewing angles and the degree of magnification: the larger the focal length, the narrower the viewing angle and the more the camera "brings" the object. At the same time, it should be noted that the actual viewing angle is determined not only by the focal length, but also by the size of the matrix (see above). In fact, this means that with different sizes of matrices, lenses with the same focal length will have different working angles. Therefore, only cameras with the same matrix size can be compared with each other according to this indicator.
Horizontal viewing angle
The viewing angle of the directional cameras supplied as standard is horizontal.
Wide viewing angles allow you to cover a large area; this is especially important given that directional cameras are often made stationary. On the other hand, all other things being equal, a larger viewing angle will mean a lower degree of magnification - objects will look smaller, detail will be worse. Therefore, when choosing according to this parameter, you should proceed from what is more important - a wide field of view or “range”.
Illumination range
The range of infrared illumination provided in the standard pointed cameras of the kit.
IR illumination allows the camera to shoot in low light conditions (up to complete darkness); at the same time, for a number of reasons, it is preferable to classical backlighting in the visible range. The backlight range is the approximate distance from the camera to the object at which it (in total darkness) will be normally visible in the frame. Note that actual visibility may vary greatly depending on the size, colour and reflectivity of specific items; Nevertheless, the claimed backlight range allows you to fairly accurately assess the "night" characteristics of the camera.
Water resistance
The degree of protection of the camera from moisture and foreign objects according to the IP standard. Thanks to it, it is possible to select
waterproof models available for full outdoor use.
This protection describes how much the camera body protects sensitive internal components from these impacts. Standardly, it is denoted by the letters IP followed by two numbers. The first digit means protection against penetration of solid objects and dust; its individual values correspond to the following levels of protection:
1 - protection from objects with a diameter of more than 50 mm (large body surfaces)
2 - from objects with a diameter of more than 12.5 mm (fingers, etc.)
3 - from objects larger than 2.5 mm (most instruments)
4 - from objects more than 1 mm (almost all tools, most wires)
5 - dust protection (complete protection from contact; dust can penetrate inside, but does not affect the operation of the device)
6 - dust-tight (case with complete protection from dust and contact).
The second number characterizes protection against moisture, here the values can be as follows:
1 — protection from vertically falling drops of water;
2 - from water drops with a deviation of up to 15° from the vertical axis of the device;
3 - from water drops with a deviation of up to 60° from the vertical axis of the device (the minimum level that allows you to operate th
...e camera in the rain);
4 - from splashes from any direction;
5 - from jets from any direction;
6 - from sea waves or strong water jets;
7 - possibility of short-term immersion to a depth of up to 1 m (without the possibility of constant operation in submerged mode);
8 - possibility of long-term immersion to a depth of more than 1 m (with the possibility of constant operation in submerged mode).
Of course, surveillance cameras are usually not designed to be submerged under water - the last two options only characterize a high degree of moisture resistance.
In some models, one of the numbers may be replaced by the letter X - for example, IPX7. This does not mean that there is no protection, but that the corresponding parameter is not certified to the IP standard. At the same time, the degree of uncertified protection can be quite high - for example, the example above corresponds to the possibility of complete immersion under water, which requires a high degree of closure (at least dust resistance level 5). We also note that the complete absence of IP marking also does not mean that the camera is absolutely not protected from negative influences - again, the point is that the body simply did not undergo official certification. However, if dust and moisture protection are critical, you should choose among IP-certified models.BNC video input
The number of
BNC video inputs provided in the design of the complete registrar.
BNC is a standard coaxial cable interface used to transmit analogue video signal in video surveillance systems; accordingly, it is found only in analogue and hybrid sets (see "Type"). The number of BNC connectors usually corresponds to the number of analogue video channels supported by the DVR.
VGA
The number of
VGA connectors provided in the design of the complete registrar.
The VGA output (also known as 15 pin D-Sub) is for analogue video output (audio must be transmitted separately). Some time ago, this interface was quite common, but with the development of more advanced digital standards, it has lost its popularity, and today it is relatively rare (in particular, in some TVs and monitors).
