Upload & Sell: On
I tried taping the pins on mine, and it was hit and miss, mostly miss. It was a waste of time. Iy might AF fine on some lenses in very good light, but at best it will be slow, and will likely hunt a lot. I also found that it did not focus accurately with some lenses.
Is this your own experience on a 5D Mark III? Or on a different camera, like the 5D Mark II?