Fyi, MF doesn't work worth a shit with these lenses. The VF isn't designed to allow MF. I've tried it, thought I was getting close, and the final images sucked.
Have you tried taping off the pins on the TCs, so it can't report to the camera? I did that once, but don't remember which pins.
Is the camera in Manual mode when you try to MF and push the shutter. You want to stop all reporting from the lens to the camera, so you tape the pins and put the camera in Manual mode so it's not looking for an aperture reading.
Dave
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