Features: 100% brand new and high quality M42 to all for Canon for EOS mount adapter ring Make M42 mount lenses (for Zeiss for Pentax for Prakticafor Mamiya for Zenit) can be used on for Canon for EOS cameras There is no ROM connection on the ring so diaphragm control of the lens is set manually It is possible to use Macro rings and other accessories Specifications: Color:Black Size:65*7.2mm(D*H) Net weight:19g Packaging weight:29g Packing Content: 1 x M42 Lens to for Canon for EOS EF Mount Adapter Ring