Sigma 16-28mm f/2.8 DG DN Contemporary - Sony E, L-Mount

The Sigma 16-28mm f/2.8 DG DN Contemporary is an ultra-wide-angle zoom lens for mirrorless systems, offering a constant f/2.8 aperture. It features an internal zoom mechanism, meaning the physical length of the lens does not change during use, which is beneficial for gimbal balance. The optical construction includes five FLD elements and four aspherical elements to maintain edge-to-edge clarity. Check for any grit or resistance in the internal zoom mechanism. As a wide-angle lens, it is important to inspect the front element for marks that might affect image quality at small apertures. SDS verifies that the AF motor is silent and responsive. The lens should fit tightly to the mount without any lateral movement.