My lovely bride, of 40 years, bought me a new Nikon D3500 bundle. Loves me. I own a Nikkor AF d 50mm 1.8. Think it is about 13 years old. I have used it about 200 shots with the D3500 and worked great. Went to use it today and my D3500 says it is not recognized and the screen shows a blinking f_ _ _ in the aperture set area. The 50mm still works great on my D40. I reset my D3500 settings back to default. Any thoughts about what happened to my beautiful 50mm? I love it more than any other of my 8 lenses.