Wide F1.4 50mm prime ZEISS lens High-performance 50mm prime lens featuring a large F1.4 maximum aperture with outstanding contrast and resolution that are hallmarks of the ZEISS brand. The bright F1.4 maximum aperture offers excellent low light performance and adds to the 11-blade aperture and aspheric elements for gorgeous bokeh. 12 Elements in 9 Groups with two aspherical elements, including a high-precision AA (advanced aspherical) type and ED (Extra-low Dispersion) glass element, help maintain outstanding contrast and resolution right out to the image periphery. ZEISS T* coating delivers superior contrast and resolution. 50mm wide aperture Prime lens with ZEISS Planar design High-performance ‚Äònormal‚Äô 50mm prime lens is the ideal focal length for most photographers. The bright F1.4 maximum aperture delivers excellent low-light performance and control over defocussed backgrounds. A state-of-the-art optical design includes 12 Elements in 9 Groups with Advanced Aspheric and ED glass - reducing spherical aberration and distortion to an absolute minimum for a flat image plane that is consistent with the Planar name. 11-blade circular aperture for gorgeous bokeh When changing your aperture to defocus the background, the light sources appear blurred. This ‚Äòbokeh‚Äô effect of the blurred background can be enhanced with circular aperture blades used in this lens. Conventional aperture blades have flat sides creating unappealing polygonal shaped defocussed points of light. Œ± lenses overcome this problem through a unique design that keeps the aperture almost perfectly circular from its wide-open setting to when it is closed by 2 stops. Smoother, more natural defocusing can be obtained as a result.