What is the phenomenon of camera out of focus? What is out of focus?

Off-focus refers to the fact that the actual focus point after shooting leaves the original focus point you set, causing the focus to deviate, which makes the place you expected to shoot clearly blurred because of the focus deviation, which looks like the focus point has run away, so it is called off-focus. The defocus is usually not serious, and the running distance is about a few millimeters before and after the preset focus point, causing slight blur.

The phenomenon of out-of-focus actually existed in the film machine era. However, because the photos in the film era are usually not enlarged to a large extent, and the out-of-focus will not run very far, it is not easy to see a slight out-of-focus in small-size photos. In the digital age, anyone can instantly enlarge a photo to 1% on the screen, and a slight out-of-focus can be easily seen.

the fundamental reason for defocusing is that the focusing system of camera and lens is not accurate enough, which usually appears in early entry-level cameras, while high-end cameras have almost no defocusing phenomenon. In addition, the lens of the auxiliary factory with the original fuselage is also prone to defocus.

but now, due to the improvement of technology, the phenomenon of out-of-focus has rarely appeared.

In fact, most of the high-profile out-of-focus photos uploaded on the Internet are due to the photographer's failure to master the correct photography technology, unstable hand-held shooting, composition after focusing, and problems in setting the focus point, so the blurred photos taken in this way are mistaken for out-of-focus. In fact, even in the most lively time of the out-of-focus trend, the real equipment causes out-of-focus or only a small proportion.

As my friend upstairs said, "I focused on the tip of my nose and ended up behind my ears", it wasn't that the focus ran away, but that the photographer's brain ran away. If it really went out of focus to such an extent, Canon would have been smashed.