If your lens is AF, you have nothing to worry about. If it's manual focus and built after 1978, you have nothing to worry about. If it was built in 1977, you MAY have to worry about it. If it was built before 1977, don't try to mount it.
>Hi, > >How can I tell if a nikon lens is ai. I have a d200 and a >d7100. I'm using a dx 12-24, and non dx nikon 35 - 70 and 80 - >200. I also have an older 200 - 400 that I've used >successfully on my d200 and a 24mm prime non dx. I originally >bought those lenses for my now almost worthless N90s cameras. >Would they (the 200 - 400 and the 24prime) work on my D7100? > >Thanks, Mike