AF compatible at f/8

Started Nov 4, 2013 | Questions thread
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philippe trougouboff
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AF compatible at f/8
Nov 4, 2013

Can someone explains the meaning of "The center focus point is compatible with AF at f/8" ? Why f/8 only (and not f/5.6, f/11, etc)?  And what is the technical consequence of it? Sorry if my question looks dumb... Thanks a lot.

 philippe trougouboff's gear list:philippe trougouboff's gear list
Nikon D7100 Nikon AF-S Micro-Nikkor 60mm f/2.8G ED Nikon AF-S Nikkor 70-300mm f/4.5-5.6G VR Tamron SP AF 17-50mm F/2.8 XR Di II VC LD Aspherical (IF) +2 more
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