Sigma as a 300mm f/2.8 DG DN coming that will support ta 1.4x TC. You can read about the patent below. [Publication number: publication number] Japanese Patent Application Laid-Open No. 2020-170066 (P2020-170066A) [Release date release date October 15, 2020 oct 15 2020 [Name of the Invention] Rear conversion lens [Application date] April 2, 2019 Apr … Continue reading Sigma 300mm f/2.8 DG DN, Sigma 200mm f/1.8, and Sigma 250mm f/2 Patents Found