What am I? Enlarger lens?

1, i.Zoom literally means fast rising, which means "I can quickly change the focal length of the lens", and i.Zoom 23X means "I am a machine that can quickly zoom by 23 times". Here 23x refers to optical zoom. 50X and 1200X are multiples of digital zoom. The zoom ability of a machine is mainly measured by its optical zoom multiple, not digital zoom (because it is of little significance).

2. In focus mode, point focus means focusing on a point in the center of the picture, center focus means focusing on a surface in the picture locally, and multi-point focus means focusing on several different points in the whole picture evenly.

3. The camera often loses focus because you don't have a fixed subject and keep moving or inching the lens, which causes the machine to keep focusing with the jitter of the machine. When the focus is not completed or just completed, you move the lens again, and the machine will refocus again, thus causing the phenomenon of "frequent out of focus".