LP What kind of sports do you shoot? The sport and shooting location will drive the gear. Example, I did not think of tennis as a LONG lens sport. But I had to resort to a 500mm lens (on a D7200 DX body) to shoot across 5 courts to #6, the 300mm did not have enough reach. And when you NEED to reach, a DX body gives you the 1.5x crop advantage. So that 500mm lens on my DX body is like a 750mm lens on a FX body.