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Message: <blockquote data-quote="Roy C" data-source="post: 1629892" data-attributes="member: 18798">I also think the 40D focuses virtually instantaneous with my birding lens but this has more to do with the lens than the camera. I must have read thousands of post with regards to the 50D v 40D and cannot remember seeing another single post where anyone regarded the AF on the 50D as been so much better than the 40D. As far as I know the AF systems are virtually the same so there is no reason why the 50D should be vastly superior . I have read where some people claim the AF is a little better on the 50D and more still that claim there is virtually no difference between them as far as AF is concerned.I have, of course, read lots of post where people prefer the 50D because of more pixels, better monitor, Live View AF and MFA and that's fair enough if those things matter to you. I would say that the 50D is a better camera than the 40D but like Peter many of the improvements are of no real interest to me.  I have also read countless post's where people claim that the high ISO noise on the 50D is inferior to the 40D and yet you claim you like the way you can use a much higher ISO! most people slate the 50D high ISO performance when compared to the 40D so this I do not understand at all.As long as you are happy with your camera, then that is great Kim but to give the impression that the 50D AF is vastly superior to the 40D is not a widely held view you must admit.</blockquote>