My father was a photographer and used a Nikon F2 SLR for many years. He left me lots of equipment, but when I try to use equipment from the film based era, I have a big problem. Specifically, I can attach a lenses to my Nikon D3200 dslr. I set the camera to manual but the camera does not recognize the lenses. I know there is a way of programming the camera with the lenses specification but I am not sure how to do this. Actually I do not even know how to recognize the lenses spec i.e. focal length etc., simply by looking at it. How do you do these things? Also do you return all settings to default if I make a mess of this? Thanks in advance.