With an overall DxOMark score of 25 points, the Nikon AF-S 200-400mm f4G ED VR II is the best-performing long telephoto zoom lens on the Nikon D750. Notching up the best results for Sharpness, Transmission, and Distortion, the Nikon 200-400mm is best at 350mm f/4, where it resolves its greatest levels of sharpness.