any info on the AF confirmation chip? does it has to be retrofit, as in taking the lens apart?
stuck on the back apparently, you could use the same chips edmika puts on his FD-EF adaptors
you have to program the info into them so they report lens focal length and aperture correctly to the camera
I have and did.
It's easiest to line the chip up in the correct posistion either by pulling the rear mount off the lens (4 screws, not a big deal), or by lining up the pins on an extension tube (kenko or canon, as long as it's an extension tube with pins). Being able to see where the pins line up makes it so much easier, if you're trying to line up the pins on the chip using the lens on a camera, you won't be able to see anything and it's almost impossible.
The chips edMika uses come from ml-gvalt on ebay (in lithuania or something). Same as the chips from peleng8.com
They're a bit weird to program, have to half-unmount the lens and whatnot, but after installing 3 chips i'm getting better at it...