M42-EOS Camera Lens Mount Adpter Ring

Features:
A great solution to unify your camera parts. Made of durable aluminum alloy material and built to last.
Makes M42 mount lenses (for Zeiss, Pentax, Praktica, Mamiya, Zenit) can be used for Canon EOS cameras, such as 5D, 5D2, 5D3, 7D, 60D, 450D, 550D, 600D, 750D, 760D and so on.
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.
With AF-Confirm chip.
Support focus infinity.