Originally posted by lol101 If you can feel the difference, it's what matters.
Right.
I have now word from three owners of the lens who confirm that it is slower than the FA50.
Here's my test procedure anyway:
I put the camera on a tripod.
Distance to target about 50 cm.
I turned the focus ring to infinity.
I attached a microphon to the lens.
I pressed the shutter.
I measured the duration of focussing using AUDACITY.
I did this in low light.
The time was about 1.5-2 s for the DA and 0.5-0.6 s for the FA.
I even had a 3 s DA focus. It depends, I don't know on what.
In brighter conditions the values are shorter.