What are the main functions of wide-angle lens and telephoto lens?

The main functions of wide-angle lens and telephoto lens are:

Wide angle lens:

The role of wide-angle lens is that the lens has a large viewing angle and a wide field of vision. The range of scenery observed from a certain viewpoint is much larger than that seen by human eyes at the same viewpoint; The depth of field is long, which can show a fairly clear range; It can emphasize the perspective effect of the picture, be good at exaggerating the foreground and express the sense of distance of the scene, which is conducive to enhancing the appeal of the picture.

Telephoto lens:

The function of telephoto lens is to obviously compress the depth distance of space and exaggerate the background. When using a long focal length lens, it is usually used to shoot distant scenes. Due to the absorption of air and the influence of diffuse light, the contrast of the captured image is small, and the dust particle extinction is serious, so it is not easy to achieve very accurate focusing.

When shooting with a telephoto lens over 300mm, it is difficult to focus all colors of light on one point, resulting in sub-spectral problems. Based on the above situation, sometimes the image quality of the shot works is not high.

Extended data:

A photo taken with a wide-angle lens. It can not only highlight the central theme and prospect, but also have a wide background. You can shoot more scenes in a smaller environment, and at the same shooting distance, you get smaller scenes than those shot with a standard lens. When shooting close-range, perspective deformation will occur, which will increase the sense of distance between the front and back scenes.

Because of its long depth of field, it is easy to take clear photos of distant and far scenes. Generally speaking, lenses with focal lengths of 24 mm and 28 mm are ordinary wide-angle lenses. When shooting with them, if you use a flash, you need to pay attention to the lighting angle of the flash must be greater than the viewing angle of the lens. Otherwise, the four corners of the photo will be darkened. At this time, the flash diffuser is applied, but the effective light efficiency of the flash will be reduced.

Baidu encyclopedia-wide-angle lens

Baidu encyclopedia-telephoto lens