The tests explained!
We test lenses to their limits in three key areas of optical performance – sharpness, colour fringing and distortion
Sigma AP O 300-800mm f/5.6 EX DG HSM
Sigma 120-300mm f/2.8 DG OS HSM S
Nikon AF-S 200-400mm f/4G ED VR II
Nikon AF-S 80-400mm f/4.5-5.6G ED VR