HOW WE TEST
We combine real-world shooting results with rigorous lab testing to arrive at our overall ratings
T o test performance, we use lenses in all sorts of lighting conditions, indoors and outdoors. We check build quality and handling, smooth and precise operation of all controls, the speed and accuracy of AF, and the effectiveness of IS, where fitted. We typically test full-frame lenses on a range of full-frame and APS-C bodies, whereas lenses that are designed specifically for APS-C format bodies are only tested on the latter.