The Planar T 1.4/85 ZF-lens is a short, high speed telelens for the exacting SLR photographer. It provides an unusually bright and clear image in the finder. Even at full aperture, it delivers top image quality. Its angle of view and exceptional performance make the Planar T 1.4/85 ZF the lens of choice for portraiture on location or in the studio. Its shallow depth of field at wide apertures allows the use of selective focus to emphasize the primary subject by defocusing the background. The lens's bokeh (the imaging of out-of-focus zones), resulting from optical design and the 9-blade iris, is outstanding. Geometrical distortion is imperceptibly low, allowing high quality documentation photographs, both analog and digital.