The Zeiss Sonnar T F/1.8 Wide Angle Fixed/Prime lens has 24 mm focal length. The lens features seven aperture blades that form a near circle. The extremely wide maximum aperture of f/1.8, is ideal for shooting under low-light conditions and with the seven blades that form a near-circular aperture, it can also create photos with lovely shallow depth of field. Direct Manual Focus (DMF) allows you to manually focus after autofocus, so you can easily fine-focus without switching modes. The large f/1.8 aperture is an ideal choice for shooting interiors in low light, as well as for superb background defocusing.