One of the problems of using manual focus lenses on Canon EOS bodies is that focus confirmation is disabled. When AF lenses are used - even in manual focus mode - all Canon EOS bodies confirm focus with a green dot in the viewfinder and an (optional) audible beep.

However when non-EF compatible lenses are used via an adapter, the focus conformation is disabled. Canon didn't have to do this, but they chose to. Unless the camera thinks that an EF compatible lens is attached to it, it switches off both visual and audible focus indication.

If the camera could somehow be tricked into thinking an EF lens was attached, then the focus confirmation indicators should work with any lens attached. Well, this is just what the developer of this special AF adapter has done.

Detailed programming instructions in English, other English, German, French, Portugal, Russian.

How to Detect back-focus in your Lens.

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