What is 50 mm 1.4?

The 50mm 1.4 lens is a popular lens among photographers for its versatility and ability to produce shallow depth of field. The 1.4 refers to the maximum aperture of the lens, which allows for more light to enter the camera and produces a shallower depth of field than lenses with smaller maximum apertures. This makes it ideal for portrait photography, as it can blur the background and highlight the subject. It is also commonly used for street photography, low light photography, and general purpose photography. The 50mm focal length is considered close to what the human eye sees, making it a natural choice for many photographers.