>The first AI lenses have the prong for older meter systems.
>All of my manual focus lenses are AI with the prong and work
>on my D7000 in A or M mode. iTTL flash also works.

All manual focus lenses whether they are pre-AI or AI have the metering prong. That's not what makes them AI. Also AIS lenses except for the Series-E and the later AIS 50mm f1.8 had prongs. The difference is the addition of the cutouts in the bottom of the aperture ring.

Len

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