Camera Adapter Ring Tube with Af Confirm Chip Metal Electronic for Pk P K (Pentax & Ricoh) Lens to Canon EOS Ef Dslr Cameras Such As: Canon EOS 1d, 1ds, 1d Mark Ii, 1ds Mark Ii, 1d Mark Ii N, 1d Mark Iii, 1ds Mark III Canon EOS 50d, 40d 30d, 20d, 10d, 5d, 5d Mark Ii, 7d Canon EOS 500d, 450d, 400d, 350d, 300d Etc. And Other Canon Film EOS Cameras