I have seen a photographic work, and the objects to be expressed in the vicinity are very clear. Besides, all the scenery is very blurred. What kind of photography technology is this?

I have answered a question before, just copy it directly, just like yours ~

This effect is called background blurring, that is, the subject is clear and prominent, but the unnecessary background will be blurred, so that the theme to be expressed can be highlighted.

background blur is very simple, and the aperture f value is reduced, that is, the aperture is adjusted to the maximum (the aperture f value is inversely related to the aperture size). Then use the long focal length, that is, the lens is stretched to the longest. In this way, the photos taken will have a blurred effect. The general machine can be photographed well, and the blur effect is good. The obvious degree of blur depends on how wide your aperture can be and how long your focal length can be ~