Normal Lens

For cameras that use 35mm film (or an equivalent digital sensor), a focal length between 35mm and 50mm is considered “normal.” As indicated by its name, this kind of lens is the prime choice for cinematographers. That is because it produces the least distortion of any type.

The normal lens best approximates the way the human visual system experiences a scene since lenses in the normal range reproduce the depth relationships of objects in a way close to human vision. Lenses with longer focal lengths are called telephoto lenses. Whereas, lenses with shorter focal lengths are designated as wide-angle lenses.

Both types of lenses have certain characteristics regarding depth relationships, perspective distortions, depth of field, and angle of view. These set them apart from normal lenses.