As has been mentioned by others, the F3 and FE2 require AI lenses for open aperture metering in both manual and autoexposure modes. AIs lenses also work (they're a newer version of the AI designed for Nikon bodies that offer program auto modes), as do the AF-Nikkor lenses and AF-D Nikkor lenses, except the G and DX series lenses (G lack an aperture ring, needed by older Nikons, and DX are for crop-sensor digital cameras and won't cover the full 35mm frame). The regular AF and AF-D lenses work as AIs lenses on manual focus Nikons.
AI'd lenses are older non-AI lenses that have had their aperture ring replaced with an AI aperture ring, making them compatible with bodies that need AI lenses....so AI'd lenses also work on the F3 and FE2. Non-AI lenses require stop-down metering on the F3, I don't think they can be mounted at all on the FE2.
Confused yet? Nikon has too many lens types that use the basic F-Mount but with different methods of interfacing with the exposure meter in the camera depending on the age of the camera it was made for. On top of that are lenses made for the last film Nikons like the F5 and F6 that control the aperture setting from a wheel on the body instead of using the aperture control on the lens...that's why G-series Nikkors lack an aperture ring! Then there's digital lenses (DX) made for Nikon's crop-sensor cameras like the D70 and D300. Ughhh!
