Viltrox 2x Teleconverter: B&H Photo / Amazon Sony FE 100mm f/2.8 Macro GM: B&H Photo / Amazon / Adorama The Viltrox 2x Teleconverter now supports the Sony 100mm f/2.8 GM via firmware update 1.03, which can be downloaded here. Follow SonyAddict on Facebook, Twitter, Instagram, and YouTube Plus our owners’ groups Sony a1 Owners Group Sony a9 Owners Group Sony a7 Owners Group