Thank you for your purchasing and using our products.
We are pleased to announce the availability of the update of SIGMA Optimization Pro and it is now available for download. Since the version under SIGMA Optimization Pro 1.2.0 does not recognize 50mm F1.4 DG HSM | Art, we have upgraded it to adapt the new 50mm F1.4 DG HSM | Art.
Please update your SIGMA Optimization Pro 1.2.0 to latest version. http://www.sigma-global.com/download/en/
We appreciate your continuing support for our company and products. B&H
carries the Sigma 50mm f/1.4 DG HSM Art lens