why is my Sigma 70-300mm f4-5.6 Macro DG Lens not focusing

have you dropped it or knocked it?
my guess is that something has come loose inside, at 70mm its at its shortest if I remember right so maybe its squashing a part of the focus cabling inside the lens????
other obvious one, the internal lens element is also closest to the camera at that point, does it need a clean?
good luck
my guess is that something has come loose inside, at 70mm its at its shortest if I remember right so maybe its squashing a part of the focus cabling inside the lens????
other obvious one, the internal lens element is also closest to the camera at that point, does it need a clean?
good luck