Sigma gives us another behind the scenes look at their Aizu, Japan lens factory in a video released during the CP+ trade show. It's an artsy factory tour highlighting the craftsmanship and the process of how their lenses are assembled. They released a similar video during Photokina 2012 and have since gained some popularity with their higher end 35mm F1.4 DG HSM and the 120-300mm F2.8 DG OS HSM lenses.  

What do you think of Sigma's factory tour video?