First of all, we need to understand what is a fixed focal length lens and zoom lens in, what does focal mean?

Focus refers to the focal length of the lens, which is a measure of the gathering or dispersion of light in the optical system, and refers to the distance from the optical center of the lens to the focal point of the gathering of light when parallel light is incident. Based on the criterion of whether the focal length can be changed or not, lenses can be categorized into fixed-focus lenses and zoom lenses.

Definition of Fixed Focus Lens

A lens with a fixed focal length that cannot be adjusted. The lens is labeled with only a number, such as a 50mm lens, indicating that the focal length is fixed at 50mm.

Fixed Focus Lens Features

1、Often with a larger aperture and higher optical quality, it can provide better picture quality, greater light passage and better background bokeh.

2、The structure is relatively simple, small and lightweight.

3、It is suitable for use under the condition of sufficient light, the pursuit of high image quality and the shooting subject is relatively stable.

Fixed-focus lens applications

Suitable for assembly line production observation, fixed workpiece appearance scanning and other small changes in the field of view of the situation, such as crimp wire terminal detection, instrument panel appearance detection.

Definition of zoom lens

Focal length can be changed within a certain range, so as to obtain different widths of the field of view angle, different sizes of the image and different scope of the scene of the lens. The lens is labeled with two numbers, such as 24-70mm lens, indicating that the focal length can be adjusted at will between 24-70mm.

Zoom lens features

1, variable focal length, high flexibility, you can adjust the focal length without changing the shooting position.

2, the structure is relatively complex, composed of many lenses, larger and heavier.

3, optical performance may be slightly inferior to fixed-focus lens, but with the development of technology, some high-end zoom lens has reached the level of fixed-focus lens.

Zoom lens applications

Applicable to the field of view distance more open automated inspection scenes, you can get a different range of scenes and imaging effects.

The core difference between fixed-focus lenses and zoom lenses lies in the fixed and variable focal lengths: fixed-focus lenses with fixed focal lengths usually provide higher optical performance and larger aperture, which is suitable for the pursuit of high image quality and stable shooting scenarios; whereas zoom lenses with variable focal lengths are flexible and suitable for scenarios that require flexible adjustments to the shooting range, but may sacrifice part of the optical performance.