The Zeiss 85mm f/1.4 lens for the Canon EF mount is a manual focus lens with electronic control for the aperture within the camera. Buttery smooth focusing is probably the number one highlight of the lens. The Zeiss signature contrast and sharpness is ever present. An excellent portrait or fashion lens. Shallow depth of field. Beautiful bokeh created by the circular aperture blade. The entire area of the lens are quite sharp with a bit of drop off in brightness in the corner when shot wide open at f/1.4. It's like a bit of natural vignetting built in the lens that can help isolate your subject.