I gave this lens a bad rating and I am now exchanging it. I sent the lens back thinking it was out of focus. I was stupid and didn't read the instructions for the lens. Now that I figured it out (by calling up the really great Olympus tech help) it has a clutch that I had to use to switch from manual to auto focus. The technician sounded like he had told many buyers of this lens about the clutch. I hope this helps others who are too lazy to read their manuals. The lens is really amazing.
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