prime lens

This term refers to a lens with a single, fixed focal length, contrasting with zoom lenses that allow the user to change the magnification. Because they are optimized for one specific focal length, these lenses typically offer higher image quality, less distortion, and larger maximum apertures, making them ideal for low-light photography and shallow depth-of-field effects.

In professional photography, the choice of a prime lens often dictates the photographer's physical relationship with the subject, as they must move their body to reframe the shot rather than relying on a zoom ring. This is frequently described as "zooming with your feet."