Has anyone else had sudden, uncontrollable background blur at the maximum focal length? We need a compatibility chart to see if our old camera supports this zoom. Unfortunately, we’ve misplaced the original product manual. Does anyone have a digital copy of the manual listing all the button combinations for quick lens diagnostics?

Hi everyone, Does anyone know how to switch this lens's focus ring to manual mode without damaging the internal drive gears? I'm afraid of applying too much force, and unfortunately, there are no instructions on the lens body.