Fotodiox Pro B4 Magic Adapter - B4 (2/3") Lenses to Black Magic MFT Cinema Cameras Offers the creative flexibility of a powered zoom lens for a fraction of the price of similar options Fotodiox Pro Premium Grade "No Play" Adapter, Infinity Focus Guaranteed Premium quality brass construction with a smooth surface for effortless mounting Take advantage of the typical 15x and 20x zoom lengths to be even more flexible with camera placement 24-Month Fotodiox warranty