The 80-400VR Nikkor is not the best 'ED' lens although VR does work very well. It has quite a narrow band of good sharpness approx f8-f11 but fairly acceptable depending on body and application outside this region. 80-400 is a variable aperture lens from f4.5 to 5.6 and will not accomodate a TC unless you are prepared to manual focus.
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