Quote Originally Posted by Tabazan
But ... thinking of it maybe I make a mistake in using the spot AF for action/sport pictures ...

Canon thinks so, at any rate. Here's something [url="http://www.learn.usa.canon.com/resources/articles/2011/whats_news_eos7d_article.shtml]they say[/url] about Spot AF: "[i]By forcing AF upon only a tiny area of your subject, if that happens to fall upon a part of your subject that’s relatively plain, solid and lacking detail, the AF system may have trouble focusing upon it. [/i][i]This can be a real problem with fast moving subjects, especially if they’re moving erratically. [/i][i]At times like these, actually having a larger area can be a more effective way to shoot.[/i]"


For action pictures, you might consider AI Servo mode with AF Point Expansion or Automatic AF point selection.
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