HOW We test

We combine real-world shooting results with rigorous lab testing to arrive at our overall ratings

to test real-world performance, we use lenses in all sorts of lighting conditions, both indoors and outdoors. We check for good build quality and handling, smooth and precise operation of all controls, and we test the speed and accuracy of autofocus. We typically test full-frame compatible lenses on a range of full-frame and APS-C format bodies, whereas lenses that are designed specifically for APS-C format bodies are only tested on cameras like the 80D and 7D Mark II.

In-camera corrections for chromatic aberrations and peripheral illumination (where available) are disabled, to better reveal the true performance of each lens. We also run a full range of lab tests under controlled conditions, using the Imatest Master and DXO Analyzer suites. Photos of test charts are taken across the range of apertures, then analysed for sharpness, distortion and chromatic aberrations (colour fringing).