The Sigma 85mm f/1.4 DG HSM Art Lens - is a top-end Art lens with one of the most sought-after focal lengths in portrait photography - 85mm. The background behind the subject is effectively blurred by a 9-blade aperture that expands to a maximum of f / 1.4. The minimum aperture of the lens is f / 16. The optical design of this lens includes three elements made of special glass: 2 SLD (low dispersion coefficient) and 1 element with anomalous partial dispersion and high refraction. Autofocus now works about 30% faster than its predecessor, and it also became possible to manually fine-tune focus without switching to manual mode, even in constant focus mode. The lens can also be used on Sony E-mount cameras using the Sigma MC-11 adapter.