Sigma 20mm f/1.4 DG HSM | Art - unknown Mount

The Sigma 20mm f/1.4 DG HSM Art was the first lens of its kind to offer an f/1.4 aperture at this focal length for full-frame sensors. It is constructed with a fixed petal-type lens hood to protect the prominent, convex front element. This lens is highly regarded for landscape, interior, and night sky photography due to its ability to resolve fine detail even at wide apertures. Because of the protruding front element, it is vital to check for scratches or scuffs, as standard screw-in filters cannot be used. SDS inspects the internal barrel for any signs of misalignment that could affect edge-to-edge sharpness. The focus ring should operate smoothly across the entire range. Ensure the rear mount is clean and free from burrs, and verify that the autofocus is hitting consistently on the intended plane.