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Could anyone tell me which one would be better, a Nikon 300mm f/4 (not the PF one) or a Nikon 70-200mm f/2.8 VR I + TC-14E II. I'd be using it with a D810 or D4, mostly for sports and wildlife. I already own the 70-200 but I'm unsure if a teleconverter will hamper sharpness and AF speed enough to warrant buying a whole new lens.