What is a fixed focus lens?

As the name suggests, a fixed focus lens is a photographic lens with a fixed focal length. The focal length cannot be adjusted, corresponding to a zoom lens.

Relatively speaking, prime lenses usually have larger apertures and higher optical quality, which are suitable for taking high-quality photos.

The difference between fixed focus lens and zoom lens

Fixed focus lenses and zoom lenses are two common types of camera lenses. The main difference between them is whether the focal length is adjustable. They have their own advantages when used in different application scenarios.

For example, fixed-focus lenses are suitable for use under sufficient light conditions, when high image quality is pursued and the subject is relatively stable. Zoom lenses are more suitable for use in scenes such as sports photography that require flexible zoom.

The fixed focus lens

Focal length

The focal length of a fixed focus lens is fixed, such as 50mm, 85mm, etc., and cannot be adjusted. Zoom lenses allow you to adjust the focal length by rotating or pushing and pulling the lens barrel, allowing you to flexibly choose between wide-angle and telephoto.

Weight and volume

The structure of fixed-focus lenses is relatively simple, and they are generally smaller and lighter. The structure of a zoom lens is relatively complex and consists of many lenses, so it is usually heavier and bulkier, and may be less convenient for photographers to use.

Optical properties

Generally speaking, fixed-focus lenses have better optical quality than zoom lenses because fixed-focus lenses are simpler in design and do not need to consider lens movement and complex optical structures.

Relatively speaking, fixed-focus lenses usually have a higher aperture (smaller F number), which can provide better image quality, greater light transmission, and better background blur. But now with the development of technology, some high-end zoom lenses can also reach the level of fixed-focus lenses in terms of optical performance.

Shooting method

Fixed focus lenses are suitable for shooting some specific scenes or subjects, because the focal length cannot be adjusted, so you need to choose the appropriate lens based on the shooting distance.

Zoom lenses are relatively flexible and can adjust the focal length according to shooting needs without changing the shooting position. They are suitable for scenes that require flexible changes in shooting distance and angle.