The Sigma 30mm f/1.4 Contemporary DC DN Lens is a high performance prime with a large aperture of f/1.4 designed for APS-C mirrorless cameras. Sigmas aspherical lens technology contributes to outstanding optical performance and compact dimensions. The Super Multi-Layer Coating suppresses flare and ghosting. The large aperture is great for low light and for creating depth of field. A stepping motor provides fast and accurate autofocus and is highly useful for video work.