Less than f/2

The optical structure of the LEICA SUMMILUX-M 50mm f/1.4 ASPH. consists of eight lens in 5 groups. Glass with anomalous partial dispersion (elements 2/3) was used to ensure correct color rendition. Lens element 2 is made of a fluorite-type glass while lens element 3 is made from glass originating from the former Leitz glass laboratory. Lens element 4 has an aspherical surface. Lens elements 1, 6 and 7 are made of glass with a very high refractive index to minimize monochromatic aberrations. In all every innovation currently available in lens technology - aspherical lenses, glass with anomalous partial dispersion (APO), glass with a high refraction index and a floating element - has been combined to create a lens that will set new imaging standards. This is the first Leica M lens with a... Less

The optical structure of the LEICA SUMMILUX-M 50mm f/1.4 ASPH. consists of eight lenses in 5 groups. Glass with anomalous partial dispersion (elements 2/3) was used to ensure correct color rendition. Lens element 2 is made of a fluorite-type glass while lens element 3 is made from glass originating from the former Leitz glass laboratory. Lens element 4 has an aspherical surface. Lens elements 1, 6 and 7 are made of glass with a very high refractive index to minimize monochromatic aberrations. In all every innovation currently available in lens technology - aspherical lenses, glass with anomalous partial dispersion (APO), glass with a high refraction index and a floating element - has been combined to create a lens that will set new imaging standards. This is the first Leica M lens with a... Less

The Bell and Howell 85mm F1.4 Aspherical Lens is razor sharp and crystal clear for photo and video. It is widely used as a portrait lens to shoot ultra-bright and vivid portrait pictures. Bell and Howell s 85mm lens stacks up extremely well against the Canon EF 85mm f/1.2 and against the Nikon 85mm f/1.4. The lens is manual focus and the aperture needs to be controlled directly from the lens, but at a cost of less than $300. The Bell and Howell 85mm lens is made with mostly glass and aluminum components and the build quality is superb. Its focusing is silky smooth with an internal focusing (IF) mechanism so that the physical size remains constant during focusing. There are little or no chromatic aberrations and Bokeh is just about perfect. The lens comes complete with a removable lens... Less