Each of our rangefinder cameras has a prime lens. A prime lens is a photographic lens with a fixed focal length, as opposed to a zoom lens which has a variable focal length. Prime lenses are generally simpler lenses in terms of construction and have less moving parts making them smaller and lighter than zoom lenses. The simpler construction also allows them to have a large maximum aperture making them faster than zoom lenses. Most importantly, prime lenses are optimised for their one focal length thus rendering superior quality images and suffering fewer problems with regard to aberrations.