![Permalink to Sigma 13mm F2 DC DN and Sigma 18mm F2 DG DN Patents Found](https://sonyaddict.com/wp-content/uploads/2017/10/Sigma-lenses-logo-144x144.jpg)
Patents were found for a Sigma 13mm f/2 APS-C and Sigma 18mm f/2 Full Frame lens. Sigma has a lot of patents for lenses that they haven’t brought to market, but these sound like they could be useful designs. Sigma 13mm F2 DC DN (APS-C) Sigma 18mm F2 DG DN (Full Frame) Example 2 (for […]