Despite its compact dimensions, the super wide-angle Zeiss 21mm f2.8 Loxia lens offers exceptional image quality across the entire image field of a full-frame sensor. The lens' wide focal length and bright f/2.8 aperture make it a great tool for capturing a wide range of subjects in a variety of conditions, such as architecture, landscapes and travel. The optical design has been specially developed for high-resolution, full-frame sensors such as the mirrorless Sony a series.