What is the meaning of monitoring the camera mm?
The focal length is the measure of the aggregation or divergence of the light in the optical system, which refers to the distance from the light of the lens to the focal point of the light gathering. Is also the camera (class camera) system, from the lens center to the film or CCD and other imaging plane distance. Simply say that the focal length is the distance between the focus and the vertex of the mirror.
Just a few mm words of the camera, usually refers to the lens of the focal length of the optical parameters.
10mm or so focal length, is a wide-angle focal lengths. Mainly for landscape photography, documentary photography, according to the angle of view is very large, very shocking about 24mm focal lengths, is a small wide-angle, mainly for landscape photography, documentary photography, travel commemorative photo with this focal length of about 50mm The focal length is about the standard focal length, which is mainly used for landscape photography, portrait photography, documentary photography and so on. It is the focal length. The focal length is mainly used for the portrait, still life and so on. Focal length, the focal length is often used to capture, close-up and so on about the focal length of about 500mm, is a long focal length, the focal length has been able to shoot birds and other superfluous 500mm super telephoto, birds more convenient, Super telephoto is often used in sports photography
