Fotodiox Pro New Lens Mount Adapter, Black (EOS-EOS-MCR-Helicoil) Variable focus helicoil enables multiple levels of macro Enhanced Craftsmanship and high-tolerance construction for demanding professionals Precise fit and solid connection; Lens has no Play, gap or wiggling when mounted on Adapter and no adjustments required Precision all-metal construction with chrome Plated Brass mounts for secure and solid fit Limited 2-year Manufacturer Warranty