SIGMA has successfully developed the world's first full-frame zoom lens with a maximum aperture of f/1.8. The SIGMA 28-45mm f/1.8 DG DN | Art incorporates an inner zoom mechanism, a minimum focusing distance of 30cm across the entire zoom range, and a filter size of 82mm. Despite its advanced feature-set, the lens weighs less than 1kg, making it a portable and versatile option for either hand-held shooting or a gimbal setup. Constant maximum aperture of f/1.8 Once a privilege reserved only for prime lenses, the maximum F1.8 aperture allows full-frame camera users to expose hand-held in low light and produce beautiful bokeh, while enjoying the flexibility of a zoom. This unique optical achievement has been created through SIGMA's accumulated optical design experience and advanced production technology at the company's sole production base in Aizu, Japan. Practical and stable inner zoom Employing an inner zoom mechanism, the overall length of the lens remains constant when the focal length or focus distance changes. This means the lens is easy to use when shooting hand-held, highly stable when mounted on a tripod or gimbal, and more resistant to dust and water contamination. Consistent close focus The minimum focusing distance is a constant 30cm across the entire zoom range, with a maximum magnification ratio of 1:4 at the telephoto end, providing excellent close-up shooting capabilities. As well as offering precise focus in confined spaces, the lens can therefore be used close to a subject without affecting sharpness when using the zoom. Premium build at a lighter weight By rights, such a fast zoom should be big and heavy, but while the lens's rigidity and durability protect its sophisticated optical design, this is achieved at a weight of less than 1kg. What's more, this reliable photographic tool uses a versatile filter size of φ82mm, meaning no compromise in portability or convenience.