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Message: <blockquote data-quote="postcardcv" data-source="post: 1295954" data-attributes="member: 3294"><p>I've been using a 40D for almost a year now, my first body was front focusing so I got it replaced by the seller (WHE), the replacement is spot on and has work flawlessly since. Soon afterwards I added a second body which is also spot on. I use AI servo a lot of the time and don't have any issues with it, though one shot can be handy in some situations. I had a busy week last week and took 1000+ bird shots of these less than 20 were OOF and all of these were down to subject movement or pilot error. It sounds to me like you may have been unlcky and got a dud camera, personally I try and get it replaced/repaired, when working properly it's a great camera.</p></blockquote><p></p>