Ld meets lab
We combine rigorous lab tests with real-world shooting for the most accurate results possible
To test real-world performance, we use lenses in wide-ranging lighting conditions on a variety of different camera bodies. We check for good build quality and handling, smooth and precise operation of zoom and focus rings, and test the speed and accuracy of autofocus, and the effectiveness of optical stabilisation (where fitted).
We also run a full range of lab tests under controlled conditions, using the Imatest Master suite. Photos of test charts are taken across the range of apertures and focal lengths and analysed for sharpness, distortion and chromatic aberrations (colour fringing). A summary of these results is shown towards the end of the group test, but we also take data from a wider range of apertures and zoom settings into consideration. We combine the lab tests and real-world shooting results to give overall ratings.