Quote Originally Posted by summicron1 View Post
uh, so far as I know the meter on an F2 doesn't use AI, but am happy to be proven wrong. If the "A" type does, and works on an F2, consider myself corrected.
I suppose it's a matter of definition.

The AI coupling system relied on a partial cutout of the aperture ring to convey the maximum lens aperture to the meter.
What it did in reality was change the aperture setting value that was conveyed to the meter to a "standardized" value that was uniform for all lenses.

All AI lenses had the meter coupling shoe that all F2 metering prisms require, so all AI lenses would work with all F2 metering prisms.

- Leigh