Our technical product information has been expanded to now include both Geometric and Diffraction MTF charts for new Sigma lenses. You can take a look at the technical information about the new Sigma 18-200mm F3.5-6.3 DC OS HSM | Contemporary lens on the Sigma Global Vision website to see these graphs plotted as part of the total package of information we share to help photographers understand the performance of our lenses.
Many times I’ve been asked on Facebook and elsewhere if it is possible for a photographer to keep their favorite Sigma lens and get a lens mount swap after making the decision to switch from one camera to the next, and now, finally, I can answer them with the answer they (and I) want to hear! As of September 2, 2013, owners of lenses in Sigma’s line of the Sigma Global Vision lenses: Art, Sports, and Contemporary, can now send their lenses in for a mount swap. This is a paid service, and lenses will be shipped to our Aizu, Japan factory for the mount conversion
Originally released to announce the Sigma Global Vision at Photokina 2012, this artful view into our factory in Aizu, Japan, has been getting a lot of views lately as more and more photographers are discovering how Sigma is revolutionizing the world of photography.