How to enlarge and reduce 85 fixed-focus lens

How to zoom in and out of the fixed-focus lens can only change the focusing (shooting) distance.

A fixed-focus lens cannot be lengthened or shortened. A lens that can be lengthened or shortened is called a zoom lens. Fixed focus lens, as the name implies, has a fixed focal length. You need to move the camera or move the subject to realize the change of imaging.

Fixed focus means that the focal length is fixed and the scene in front of you cannot be brought closer or farther away. The advantages of fixed focus compared with zoom are better imaging quality and easier aperture enlargement. The disadvantage is naturally that you can't zoom, and you can only rely on the photographer's actions to compose the picture.