The Sony E-mount Sigma 40mm f/1.4 DG HSM Art Lens is a wide normal-length lens distinguished by a dazzling design and complex optical layout. It was created with the exacting tolerances of a cine lens. The quick f/1.4 maximum aperture is ideal for working in challenging lighting circumstances and contributes to effects like selective focus and short depth of field. Several aspherical and low-dispersion elements are used in the optical design to reduce chromatic and spherical aberrations and increase sharpness and clarity. A Super Multi-Layer Coating is also present, which reduces flare and ghosting for improved contrast and colour accuracy when working in bright lighting.