What is a standard lens? What should its focal length be?

Standard lens, a general term for lenses with a viewing angle of about 50 degrees, and a photographic lens with a focal length approximately equal to the diagonal length of the photographed picture. Its viewing angle is generally 45 ~ 50. The lens with a focal length of 40-60 mm is 35 mm, the lens with a focal length of 6*6 cm is 75-80 mm, and the lens with a focal length of 4*5 inches is120-150 mm. ..

The standard lens is located between the wide-angle lens and the telephoto lens. The angle of view of the standard lens is similar to that of the human naked eye, so the picture taken is very similar to what the naked eye sees. Wide-angle lens exaggerates the distance between the front and rear objects, and telephoto lens compresses the distance. The standard lens is more "normal".

Extended data

The standard lens gives people a vivid visual effect picture, so it is often used in actual shooting. On the other hand, because the picture effect of the standard lens is very similar to the visual effect of the human eye, the picture effect taken with the standard lens is very ordinary, and even can be said to be "plain".

It is difficult to get the dramatic effect of the rendered picture like a wide-angle lens or a telephoto lens. So it is not easy to take vivid photos with standard lenses. Even experienced photographers think it is not easy to use standard lenses well.

However, the visual effect of the standard lens has a natural sense of closeness. When shooting with the standard lens, the distance from the subject is moderate, so it is widely used in ordinary landscapes, ordinary portraits, snapshots and other photography occasions, and it is also the most common commemorative photo.

More is shooting with a standard lens. In addition, it is easy for photographers to overlook that the standard lens is also a lens with good imaging quality, which is very effective for showing the details of the subject.

Baidu encyclopedia-standard lens