The Ai and AiS lenses fit most AF bodies, but with some bodies(N80, etc) you get no metering. The F100 allows manual and aperture priority with spot or centre-weighted, but not matrix. The aperture in use doesn't appear in the viewfinder with MF lenses. If you are likely to interchange with digital, get the F100 and AF-D lenses. My only gripe with it is the electric cable release which has a plug that can be tricky to fit( but that's probably just me!). Otherwise, it's a great 35mm camera. Alex