Monitor video of the lens classification? These scenes are used in what the environment

Answer:

Standard lens: viewing angle of about 50 degrees, but also human monocular in the head and eyes do not turn the case can see the perspective, it is also known as the standard lens. 5mm camera standard lens focal length of 40mm, 50mm or 55mm. 120 camera standard lens focal length of 80mm or 75mm. The larger the CCD chip, the longer the focal length of the standard lens.

Monitor the lens has 2mm, 3.6mm, 4mm, 6mm, 8mm, 12mm, 16mm, 25mm .... that focal length, the greater the number of focal lengths, see farther, but the perspective is relatively small, such as 2mm surveillance near Monitoring the area near the relatively large, 25mm to see the distance is far, but look at the near not.

Long focal length lens: suitable for shooting distance from the scene, depth of field is easy to make the background blur the main body prominent, but bulky and difficult to focus on the dynamic subject. 35mm camera long focal length lens is usually divided into three, 135mm the following said in the focal length, 135-500mm said long focal length, 500mm

Wide-angle lens: 90 degrees above the viewing angle, suitable for shooting distance and range of large scenery, but also deliberately exaggerated prospects of the performance of strong sense of perspective that perspective. 35mm camera is a typical wide-angle lens is the focal length of 28mm, viewing angle of 72 degrees. 120 camera 50,40mm lens will be equivalent to 35mm camera 35,28mm lens.