(just a quick'n'dirty triage scan in the film holder, haven't wet-scanned or processed or printed yet, it probably won't need much work by the looks)
As for the Tak, mine works fine. Specifically, my Super-Takumar 1:1.4/50 3527xxx works fine, to infinity and all. Focusses to infinity, mirror doesn't hit the lens on the return. There's multiple versions of this lens so maybe others have problems.
The adapter and chip that I've got are the good ones, from ml-gvalt on fleabay, specifically this one. I paid $25 in 2011 but the price seems to have gone up since. But they're the best.
(also, I do have other lenses that hit the mirror, but only on the return path, the mirror must be travelling fast enough on the upswing to inertia-past the elements. Good news is, the photo still gets taken, just focus closer to release the mirror and turn off/on each time. Annoying but works.)
Another thing is that the EOS 3 has a little quirk. I'm not sure on what bodies exactly, my 3 has it but my 7D doesn't, I don't have any others.
When you look at the body-mount, in the top-left corner there is a little switch, activated by turning the lens as you mount. From my own research (which may be wrong, I'd love to hear from others):
- If your adapter activates this switch, you must have an AF chip, or you get a 'BC' error when you take a photo. (you can test this with a toothpick pushing the switch and no lens)
- If you have an AF chip, your adapter must activate this switch, or you get a 'BC' error.
- If you don't activate the switch, and don't have a chip, then you're fine.
That's my experience anyway.
Also, someone mentioned focussing screens. I've got an EC-Civ (stock screen from the 1Dmk4), it's brighter and focusses a lot better than the stock screen that came with the 3.