A truly long-reaching lens designed for Sigma SA-mount cameras, the APO 500mm f/4.5 EX DG HSM from Sigma is a super telephoto characterized by its apochromatic optical design. Employing a pair of extra-low dispersion glass elements, chromatic aberrations and color fringing is virtually eliminated for notable clarity and color accuracy. A multi-layer coating has also been applied to realize greater contrast when working in backlit or difficult lighting conditions.
Benefitting the optical attributes is a Hyper Sonic Motor, which provides quick, smooth, and quiet autofocus performance with full-time manual focus override. The physical design also incorporates a fixed, rotating tripod collar for easy attachment to a tripod or monopod, and a drop-in filter slot permits working with rear 46mm filters, such as the included circular polarizer filter.