In a blog entry today, top-notch U.S. sports photographer Brad Mangin has written an enthusiastic assessment of the EOS-1D Mark IV's AF system, based on his use of a preproduction body at an NFL football game this past weekend. Mangin, who refers to the EOS-1D Mark III and its AF system as "a complete disaster," says the EOS-1D Mark IV, by comparison, "performed flawlessly" as it captured many more properly focused frames than its predecessor.

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