#3. "RE: Ai Nikkor lens compatibility" In response to In response to 0 Sun 30-Jun-13 08:18 PM by Leonard62
Another consideration when using AI lenses with the D5100 is you can't use the built in flash or external flash in TTL mode. But you can use manual flash mode or if you have an external flash which can operate in non-TTL Auto mode you can use that.
I use my D5100 and D3200 with AI and even non-AI lenses all the time. The reason you can use non-AI lenses is the D5100 doesn't have the AI meter coupling lever which interferes on the more advanced bodies that accept AI lenses.