Nikon 28-70mm 2.8D ED

Lens seems to have some aperture problems. From 28-50mm works great, its smooth, it focuses nicely and the aperture works just fine. But when shooting between 50mm-70mm seems the aperture doesn’t change, it stays at F2.8 all the time. Otherwise it focuses and takes sharp pictures.

P.s It might need aperture adjustment . Otherwise in good condition, comes with original box.

selling because I moved to Z camera and the lens is not in use anymore.