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1)is the 70-200/2.8VR lens compatible w/ full frame cameras like the D3?
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Yes, it doesn't say "DX" in the name.
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2) Isn't there something like 4 stops difference between the f2.8 lenses and the f1.8 lenses? I'm thinking that 4 stops in low light makes a big difference. Would that thought be on the right track or am I way off base?
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It's 1 1/3 stop. f/2.8 to f/2.0 is one full stop, and then f/2.0 to f/1.8 is one-third.