Sigma 20mm F1.4 DG HSM | Art

The full frame SIGMA 20mm f/1.4 lens was designed to bring out the full potential of high megapixel DSLRs. It incorporates two FLD (“F” Low Dispersion) glass elements and five SLD (Special Low Dispersion) glass elements (15 elements in 11 groups). The design minimizes transverse and axial chromatic aberration and, with Super Multi-Layer Coating, diminishes the effect of strong backlighting. It has an optimized AF algorithm for accurate and smooth AF functioning, and incorporates Thermally Stable Composite compound material that adds to its extreme temperature performance. The lens has a 9-blade, rounded diaphragm, and a brass bayonet mount for long term performance.