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Message: <blockquote data-quote="Adey Baker" data-source="post: 1166492" data-attributes="member: 1805">My mate bought a 40D the other week which he uses with a 400mm F5.6L and he reckons it focusses faster than his 20D and he gets more shots in focus as 'keepers' - early days, yet, but he's obviously impressed. It also works well with one of the off-centre focus points when used with his Canon 1.4x with taped pins (though it doesn't work with my Kenko 1.4x Pro without tape which now doesn't show the lens as still being F5.6 - it gives the 'correct' F8 and won't focus, unlike on my 20D where it works OK)I had a quick go with it and it certainly seemed to focus quicker and more positively with my Sigma 400mm - I shall buy from a shop when I get one in order to make sure that I get one that performs with my kit.</blockquote>