Is a prime lens better or a zoom lens better?Specific situation specific analysis.

The so-called fixed focus lens is a lens with a fixed focal length. Fixed focus lenses include wide-angle fixed focus lenses, standard fixed focus lenses, telephoto fixed focus lenses and special function fixed focus lenses.

Performance pros and cons: The number of lens sets of the fixed focus lens is relatively small, and the non-imaging stray light generated by the refraction and reflection of the lens is less. The biggest advantage is the small aberration, and the biggest disadvantage is that the focal length cannot be changed. To change the screen size, you can only move the camera back and forth, which is not convenient for composition. The image quality of the fixed focus lens is better than that of the zoom lens. If you can shoot with a fixed focus lens, you don't need a zoom lens.

A zoom lens is a lens that can change the focal length. In 1959, American Frank Back developed the 36-82mm zoom lens for the first 135 camera. In terms of angle of view, focal length and function, there are wide-angle zoom lenses, standard zoom lenses, telephoto zoom lenses, and special function zoom lenses. There are two types of lens length change and unchanged: external focus lens, the lens barrel expands and rotates when zooming. Internal focusing lens, the internal lens of the lens moves when zooming, and the lens barrel does not stretch.

The structure of the zoom lens is complicated, and it is generally composed of a focusing group, a compensation group and a fixed group. The advantage is that the zoom lens can continuously change the focal length within the design allowable range, and its angle of view also changes accordingly. The disadvantage is that due to the large number of lens sets of the zoom lens, the non-imaging stray light formed by the reflected light generated inside the lens is relatively large, which affects the image clarity.

In summary, fixed focus lens and zoom lens have their own advantages and disadvantages, and the choice of lens depends on your actual situation.