The manufacturer replace focusing ring into something like switch (or variable resistor) to detect turn left or right (and also how much you turn it, for slow focusing or fast focusing). Then the signal will go to the auto-focus motor to set the lens focus distance.
Some may feel "loose the touch" when using focus by wire.
The manufacturer replace focusing ring into something like switch (or variable resistor) to detect turn left or right (and also how much you turn it, for slow focusing or fast focusing). Then the signal will go to the auto-focus motor to set the lens focus distance.
Some may feel "loose the touch" when using focus by wire.