I love my 50 1.4 USM, problem is though that it no longer will AF. I have tried it on both my 40D and on my 7D. What might the problem be? Is best route to send it into Canon? How much would it cost to fix? Is there anything else I should be trying to do? Any help would be greatly appreciated. I consider it a valued part of my kit.
Image below was taken before the problem started with 20D and EF50 1.4 USM in Av mode, ISO 200, 1/200 sec, f/2.0
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