> A while back, someone had written how the MZ-S AF sensors were each
> sensitive to both horizontal and vertical lines, because of (I think)
> some software design.  Can someone point me to where that information
> is explained?  And why doesn't Pentax market it?   
> 
> Thanks,
> Ed

In addition to my previous reply, what I think you are looking for is Us 
patent No. 6.128.444 with the title "Multipoint focus detecting 
apparatus" in which 6-point AF is described. Unfortunately, I don't have 
the link to it anymore.

Matjaz
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