A voyeur may observe others without them being aware of it by a number of strategies. The voyeur may observe the subject from a distance, or use … Read More
A voyeur may observe others without them being aware of it by a number of strategies. The voyeur may observe the subject from a distance, or use stealth to observe the subject with the use of peep-holes, two-way mirrors, hidden cameras,secret photography and other devices and strategies. Secret photography may involve the use of normal cameras, but with the photographer being concealed. Sometimes the camera itself is disguised or concealed. The use of telephoto lensenables the distance from the subject to provide concealment.
Although spy cameras small enough to fit inside a pocket-watch had existed since the 1880s, advances in miniaturization and electronics since the 1950s have greatly aided the ability to conceal miniature cameras, and the quality and affordability of tiny cameras (often called "spy cameras" or subminiature cameras) has now greatly increased. Some consumer digital cameras are now so small that in previous decades they would have qualified as "spy cameras", and digital cameras of eight megapixels or more are now being embedded in some mobile camera phones. The majority of mobile phones in use are camera phones.
Certain image capturing devices are capable of producing images through materials that are opaque to visible light, including clothing. These devices form images by using electromagnetic radiation outside the visible range. Infrared and terahertz-wave cameras are capable of creating images through clothing, though these images differ from what would be created with visible light. Read Less