How the camera lens size is divided
???Each focal length of the lens how to use it? Wide angle lens wide viewing angle, so suitable for shooting scenery, especially ultra wide-angle lens, wide field of vision, shooting out of the scenery is particularly imposing. The angle of the standard lens is close to the angle of view of the human eye and hence the name. Standard lens application is very extensive, landscape, portrait can be competent, but also very difficult to control. Ordinary people with standard lenses to take out the photos may be stereotyped, but experienced photographers can use the standard lens with the human eye perspective similar to this feature, shooting a lot of photos with a sense of the scene. 85mm ~ 135mm in the telephoto lens is generally used to shoot half-length portrait, the use of this lens is easy to shoot out the background of the photo, looks more artistic sense. More than 200mm telephoto lens is usually used to shoot insects, ecology, stage and sports. Because the focal length is long, you can put the object far away to the eyes of the photographer, so do not have to be close to the subject can shoot out a clear picture. In the shooting of insects, ecology, stage and sports time, obviously need such a capacity.
?First lens focal length. We know or choose to buy a lens when the first factor should be considered the lens of the focal length, this parameter directly affects the shooting angle, but also directly affect the subject matter we shot. The focal length of the lens is usually expressed in millimeters, such as 35mm, 85mm, 105mm and so on. The shorter the focal length (the smaller the number), the wider the viewing angle; the longer the focal length (the larger the number), the narrower the viewing angle. In addition to the width of the angle of view, the focal length changes with our another intuitive feeling: the shorter the focal length, the subject is farther away from the photographer; the longer the focal length, the subject is closer to the photographer. Therefore, the consumption of digital cameras on the zoom function has been able to bring "pull away from the" feeling, in fact, by changing the focal length of the lens to achieve.
The division of the lens can be divided into many categories. For example, can be divided by focal lengths, in accordance with the fixed focus and zoom, according to the recent focus distance division, can also be divided in accordance with the brand and bayonet, or in accordance with the level of division. Sounds more complicated, but it is not difficult to explain.
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???For the 135 specifications of the digital SLR, usually the focal length of 24mm below the lens called ultra wide-angle lens, 24mm ~ 35mm lens called wide-angle lens, 50mm ~ 85mm lens called the standard lens, 85mm ~ 135mm lens called medium Focus lens, more than 200mm lens we call telephoto lens, if the focal length reached more than 400mm, it is super telephoto lens.
