It was pretty exciting to borrow my dad's old Nikon 55mm f/2.8 AI-s and try it on my Nikon D3200. I have to use it in full manual mode, but it gets great results! Amazing how a lens designed in 1979 still works on the new cameras.
However, I was wondering why the camera does not allow me to control the aperture from the camera itself. I can see that the lens has an aperture control ring, which looks similar to the modern lenses I have. I also notice that there is a pin around 8 o'clock on the mount that gets depressed with the AI-s lens but stays free when using a modern lens.
It feels as if Nikon intentionally designed the D3200 to not do aperture control on this camera for AI-s lenses even though it may have the capability to do so. Is that a correct assumption? If yes, then I was just curious, why would they want to do that?