Fixed focal length surveillance cameras

Fixed

— fixed focal length lenses have a fixed angle of view — in other words, they work at a constant zoom level and are not able to change it (the only option available for such cameras is electronic zoom). The advantages of such optics are simplicity, reliability, almost zero power consumption, small size and low cost. The main disadvantage is the inability to work with optical zoom; and said electronic magnification is less advanced, since when approaching, the clarity of the “picture” decreases.