Meaning of numerical size of camera wide-angle lens

The numerical value of the wide-angle lens indicates the focal length. Simply put, the smaller the camera value, the smaller the focal length and the better the wide-angle effect.

0.43 times and 0.45 times represent the magnification. The smaller the number, the wider the angle, but not the smaller the better. The smaller the number, the greater the image distortion (manifested as the building becoming inclined and the edge becoming straight and curved), the greater the decline of edge imaging, and the more serious the edge dispersion. The fisheye of 14 belongs to the fixed focus value and does not involve zoom multiple. But if the lens is a zoom lens of 18-70mm, it is a zoom of 3.8 times.

Extended data:

The basic characteristics of a wide-angle lens are its large viewing angle and 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.

You can emphasize the prospect and highlight the contrast between far and near. This is an important performance of wide-angle lens. The so-called emphasis on foreground and far-near contrast means that wide-angle lens can emphasize far-near contrast more than other lenses.

In other words, the photos taken with wide-angle lens are closer and farther, which makes people feel that the distance has been widened and has a strong perspective effect in the depth direction. Especially when shooting with a super wide-angle lens with short focal length, the effect of being near big and far small is particularly remarkable.

Generally speaking, it is taboo to use a wide-angle lens when the subject is exaggerated and deformed. In fact, it is not necessarily undesirable for the subject to exaggerate and deform appropriately. Experienced photographers often add content, use wide-angle lenses to moderately deform the subject, and take some very inconspicuous scenes that people turn a blind eye to.

Of course, using a wide-angle lens to express exaggeration and distortion should be based on the needs of the subject matter, and the second should be few and precise. No matter whether the theme is necessary or not, it is not worthwhile to abuse the exaggerated deformation of wide-angle lens and blindly pursue the bizarre effect in form.