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Message: <blockquote data-quote="CAU" data-source="post: 1331188" data-attributes="member: 55324">I was mainly referring to the ability to focus on moving subjects in the AI servo mode.You might want to read Rob Galbraith's opinion on the difference between the autofocus on the 1D series and on the 40D (scroll down to the question regarding the 40D):<a href="http://www.robgalbraith.com/bins/multi_page.asp?cid=7-8740-9068-9537" target="_blank">http://www.robgalbraith.com/bins/multi_page.asp?cid=7-8740-9068-9537</a>Some excerpts:"With an EF 300mm f/2.8L IS or EF 500mm f/4L IS lens attached, the EOS 40D produces an unacceptably low percentage of properly focused or even usably focused frames of track events, soccer, rugby, football and basketball in our testing." "A midrange digital SLR with a midrange price tag probably can't be expected to offer the same autofocus performance as the company's best. Even taking that into account, though, the 40D doesn't fare well. It's not that it can't do the job at the level of a more expensive camera, it's that it can't do the job really at all."Rob Galbraith isn't just the average photographer, for example he was one of the first ones to note the AF issues on the Mk III, which then prompted new firmware releases from Canon:<a href="http://www.dpreview.com/news/0707/07072101canon1dmkiiifirmware.asp" target="_blank">http://www.dpreview.com/news/0707/07072101canon1dmkiiifirmware.asp</a>People who have changed from the XXD series to the 1D series say the same (at least those that I personally know), the autofocus of the midrange cameras isn't comparable to the performance of the 1D cameras. Certainly you can get some good flight shots with the cheaper cameras, too, especially if you photograph easy subjects, but the 40D just isn't an alternative to serious flight photography.</blockquote>

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