Bright, fast f/1.4 aperture Robust EX Build 2 low-dispersion glass elements The Sigma 30mm f/1.4 EX DC HSM is a prime wide angle lens best suited to landscapes, group portraits and urban photography. The bright f/1.4 aperture produces a shallow depth of field effect, and the robust EX build allows for professional-level usage in varying weather conditions without affecting the inner workings of the lens. The low dispersion glass elements also insure chromatic aberrations are kept to a minimum. The Sigma 30mm f/1.4 EX DC HSM is designed for APS-C DSLR bodies, making it light and simple to transport, allowing for the newcomer to get to grips with a wide array of photographic styles with this bright prime lens.