The E 75mm F1.8 PORTRAIT HELIAR is unique to the Voigtlander lens lineup. A SPHERICAL ABERRATION PORTRAIT CONTROL RING is calibrated from 4 OVER to 6 UNDER for a new portrait experience which varies with the aperture used. Manual focus for precise focus control. Test at different apertures and different control ring settings to discover which setting YOU prefer for YOUR photos! The lens aperture controls the aperture. The control ring controls the amount of softness. The PORTRAIT HELIAR offers photographer controlled soft focus bokeh. The lens communicates with the E body by electronic contacts for Exif data. 5 axis image stabilization with comptatible bodies. Filter size 62mm. Close focus 27.5" or .7m. Weight 19.75oz or 560g. Fstop range F1.8 to F9.