[toni-a]

You can't just take any MF design and add an AF motor. AF lenses tend to have a more lightweight focus group. And QC has to be MUCH better because the focus group isn't quite as "tight".

Actually if silent and fast autofocus aren't priorities, and the customer is happy with a crappy autofocus, adding a micromotor that does nothing but move the focus ring can make any lens autofocus, it has its many drawbacks but  it's surely feasible