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"RE: Quality of glass"
I think you may be confusing some terms... The 80-200mm f/2.8 and 70-200mm f/4 Nikkors are both "FX". Nikon's newer lenses tend to lack aperture rings, whether they are FX or DX. The "G" designation denotes the absence of a ring.In general, there is no relationship between FX/DX and quality - there are lower-end "consumer" lenses in both DX and FX lines - though it is true that most of the top-end lenses tend to be FX.