A few days ago I purchased this strange new adapter on ebay from a vendor named "muh_select" and expected an awful chinese rip-off adapter because I only paid ca. $65.
In fact, it's pretty good.
So, today, I put a Canon 1.4/50mm ( a nice 1.4 portrait lens for a Pen), 4/24-105, 4/300 plus the 1.4x extender, e.g. a massive 5.6/420mm that dwarfs my Pen FT.
All works fine... well, except the autofocus, stabilizer and, of course, there is no way to stop down an EOS lens without all the electronics that are built into an EOS camera.
Useless? No, in my Pen FT I use 100 ASA films like the Ektar or Tmax 100, f4 or 5.6 and short exposure times, that's okay for me in the winter, and I own a 4x neutral density filter in case I need it.
But, much more important:
The EOS lens mount has a very short flange and allows to adapt many different lenses: Leica R, Leica Visoflex, Nikon F, Pentax Screw, Contax/Yashica, Olympus OM and probably many more (not Leica M, unfortunately).
I have a variety of very good lenses from various manufacturers and some adapters, this will be fun
My mind whirls! So much information and so little mind to absorb.
wonder of Canon