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Mark, I don't remember which pins are the ones to tape off, but from what I've heard, it may not be worth it as the AF becomes extremely slow and misses target a lot. I would stick with manual focus unless you have lots of time to wait with patients.
I believe blocking the pins stops the lens from communicating fully what aperture it is at allowing the camera to keep focusing. Don't quote me on that, I read about it a very long time ago, and I might be miss-quoting as a result. But it can be done.
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