Canon EF-EOS R Adapter – Timeless Connections. The Canon EF-EOS R Mount Adapter bridges the gap between your Canon EOS R system and the legendary EF lens world, which has been captivating photographers since 1987 and continues to stand for quality. Weighing just 110 g and with compact dimensions (71.2 x 24 mm), it allows seamless use of EF and EF-S lenses without compromising autofocus, image stabilization, or image quality. The robust metal bayonet mount and dust- and splash-proof construction make it a reliable companion. A touch of nostalgia meets modern precision – your treasured lenses find a new home.