Videoglazok as a specialized camera, which has an outer appearance of a typical door peephole and located in the door instead of him, in essence, is a purely Russian invention. His appearance in this country is due, we think, apparent socio-economic and historical factors prevailing in Russia in the last decade. First of all - this camera for covert installation and concealed installation of equipment is widespread in Russia, not from all-embracing "spy mania", as a result of the desire to maintain equipment and shield it from the sophisticated domestic vandalism. In the West, the population is satisfied with entryphone. In developed countries, law-abiding citizen should have an intercom entryphone and freely gives herself to consider. Therefore, the angle of the horizontal camera video intercom at 70-90 degrees with infrared illumination center of the visual field in the near zone is sufficient. In our conditions, with the bell on the door you can feel relatively calm, if watching from a distant room apartments all landing on the floor to the ceiling, and it is desirable and stairs. With the fragmentation and episodic coverage of our entrances and invisible infrared light is required with a range of not less than 3-4 m around the corner of videoglazka.
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