The following is a review of the Sigma 100-400mm F/5-6.3 DG OS HSM Contemporary lens which was released in February of 2017 as part of Sigma’s affordable “Contemporary” lens lineup. The introduction of the Sigma 100-400mm F/5-6.3 DG OS HSM C lens is a logical one for the company as it competes in a market segment that remains unexploited by the likes of Canon and Nikon.
