Autofocus with extenders attached

[jjkriel]

I frequently see posts where people talk about taping over pins on extenders to fool the camera into autofocusing. Can someone tell me which pins to tape over on canon extenders?

[DuQues]

With the converter in hand:

Looking at the end of the converter that attaches to the lens.
Rotate it so the contacts are at the top.
The leftmost 3 contacts are the ones to tape over.
For reference, the rightmost 3 contacts are on a raised area.

Good luck, I tested it two years ago, and it works. But do not expect AF to be fast...