A compact high-resolution 20 mm F1.8 prime lens Sony's latest optical technology achieves impressive corner-to-corner resolution from maximum F1.8 aperture in a large-aperture wide-angle prime lens. It is also remarkably compact, and matched with an E-mount body, makes up a versatile mobile system with outstanding Af performance, control, and reliability for a wide variety of shooting needs. Ultra-wide 20 mm perspectives, superb resolution from F1.8 Two Aa (advanced aspherical) elements in an innovative optical design minimize aberration for outstanding corner-to-corner resolution right from the lens's widest F1.8 aperture. Compact and lightweight for enhanced mobility and handling An advanced optical design that includes two Aa elements is supported by a refined mechanical system in a G Lens that weighs just 13.2 oz (373 g).