Lens testing is the process of evaluating the optical performance of camera lenses. This involves assessing various factors such as sharpness, distortion, color accuracy, and bokeh. By using standardized charts and controlled lighting conditions, photographers and manufacturers can determine how well a lens performs in different situations. During lens testing, professionals often compare results against established benchmarks or other lenses. This helps identify strengths and weaknesses, guiding consumers in their purchasing decisions. Additionally, lens testing can reveal how a lens interacts with different camera bodies, such as those from Canon, Nikon, or Sony.