The YN2.0X II is the updated version of YN2.0X. The optical design and glass coating have raised the level of the teleconverter. In addition, the redesign of the upgraded electronic aspect make the auto-focusing function of teleconverter able to adapt to more lens. Such as the EF70-200MM F/2.8 L IS II, the EF70-200MM F/2.8 L IS II USM and most of the lens can achieve automatic focusing.