My Zeiss 24-70 has performed flawlessly until a week ago, when it suddenly decided not to focus at infinity - AF or MF.
The index mark turns to the infinity mark, but the far-off images are very blurred - although closer subjects are rendered sharp. I guess that somehow the lens elements have shifted inside the barrel.
Focusing on subjects close by, say 1-10 metres, is fine. And infinity is fine if one stops down to f16. It's as if the lens just cannot retract enough to reach infinity.
The lens is under warranty and is on its way back to Sony, but I wondered if anyone else has had a similar problem with this or any other lens.
Incidentally, all my other lenses are working perfectly, so it's not the camera.