The Sony E-mount AF 18mm f/2.8 FE from Samyang is also distinguished by its especially compact and lightweight design. Its optical design includes a series of aspherical, high refractive index, and extra-low dispersion elements, which reduce a variety of aberrations in order to produce well-controlled, sharp, and clear imagery. Additionally, the lens's linear STM autofocus motor works in conjunction with Sony cameras' AF systems for quick, quiet, and precise focusing performance, and manual focus override is also available for more refined control. The compact ultra-wide-angle prime is designed for full-frame Sony E-mount mirrorless cameras, however, it can also be used with APS-C models where it provides a 27mm equivalent focal length. The f/2.8 maximum aperture helps to achieve a compact, lightweight design while remaining suitable fast enough for working in available light conditions. Three aspherical elements and two high refractive index elements control spherical aberrations and distortions for improved sharpness and resolution. The integrated linear STM autofocus motor works in conjunction with Sony cameras' focusing systems for quick, quiet, and precise AF control. Manual focus override is also available for refining your focus position.