Photokina 2018: Sigma interview - 'There's no magic to it, we just try to be unique'

Katuto Yamaki, CEO of Sigma, pictured at this year's Photokina trade show in Cologne Germany, last month. We spoke to several senior executives last month in Germany at the Photokina trade show. Among them was Sigma CEO Kazuto Yamaki, who shared his thoughts on the photography marketplace in general, and the just-announced L-mount alliance. The following interview has been edited for clarity and flow. How did the L-mount alliance come about? I don't remember exactly when but I think it was two o...