Zeiss 35mm 1.4 Distagon T ZM Lens for Zeiss Ikon and Leica M Mount Rangefinder Cameras - Black Fast f/1.4 maximum aperture for shallow depth of field and low-light performance Optimized for digital sensors, and produces an excellent flat image field Zeiss T* anti-reflective coated lens system enhances image contrast and clarity Ergonomic finger rest on focusing ring for increased speed and precision Aperture range: f/1.4 f/16; Focal length: 35mm