Fringer Smart Adapters have been around for a while and are usually first to market with a lot of great features, but there is a lot of competition today. While the Sigma 18-35mm f/1.8 DC HSM Art’s performance looks very good in the above video, Techart and Steelsring aren’t far behind Fringer. I have only personally used Techart AF adapters … Continue reading Fringer Smart Adapter Sigma 18-35mm f/1.8 DC HSM Art PDAF Demo