A
The adapter should fit. The lens guarantees the infinity setting
A
If by non-AI you mean Nikon G or P class lenses (those that don't have aperture rings) then it won't work with those. This is for older lenses where you also have an aperture ring.
A
Hello - I use the adapter to adapt a non AI lens to my Sony with another adapter (Canon to e-mount) - this way the focus works on infinity. I hope that answers your question.