Wide-angle 28mm lens is designed for FX-format F-mount cameras, however can also be used with DX models where it provides a 42mm equivalent focal length.. Bright f/1.8 maximum aperture benefits working in low-light conditions and also affords control over depth of field for working with selective focus techniques.. Two aspherical elements are used to reduce spherical aberrations and distortion in order to realize sharp imagery with accurate rendering.. Both a Nano Crystal Coat and a Super Integrated Coating have been applied to individual elements to suppress internal reflections, flare, and ghosting for improved contrast and color accuracy when working in strong lighting conditions.. Rounded seven-blade diaphragm promotes a pleasing out of focus quality that benefits the use of shallow depth of field and selective focus techniques.