T3i-how to choose AF 9 points?

Started Dec 24, 2012 | Discussions thread
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T3i-how to choose AF 9 points?
Dec 24, 2012

I read some posts below and made me think AF that i have never thought about.  If i choose 9 AF points all lite up; does it mean the camera will automaticllay choose the best "ONE" point as a main focus point?

If i choose 9 AF points with a nifty fifty; sometimes focus is good and sometimes is no good?  Would this explain the why?  If so, would choose center focus with nifty fifty be better?

If i choose center focus and say F4 and up, would the close subjects surround center be out of focus?

Last, how wide is the center focus parameter?

Thanks and much appreciated for some Christmas family photos.

 todaymarksix's gear list:todaymarksix's gear list
Canon EF 50mm f/1.8 II Canon EF-S 18-55mm f/3.5-5.6
Canon EOS 600D (EOS Rebel T3i / EOS Kiss X5)
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