I've read the same thing somewhere but don't seem to be able to find it
now. While searching I was reading Canyon's white paper on the 5D and
discovered that, in addition to the 9 visible auto focus points there
are another 6 that are hidden but these are only used in tracking moving
objects. An interesting comment was: "Predictive AF can focus track a
subject approaching at 186 mph up to 66 feet away with an EF 300mm
f/2.8L IS USM lens."
Chuck Norcutt
Johnny Johnson wrote:
>
> On a related note - have you ever seen any info as to the
> relationship between the focusing area shown by the rectangle/square
> in the viewfinder as compared to the actual area covered by the
> focusing sensors? I've read that on some Canon bodies the focusing
> sensor covers a larger area than the indicator in the view finder
> which, of course, could lead to unexpected results.
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