We test the camera’s focusing speed at various light levels to show how it slows as the light level dims. Specifically, we test at EV 12, 10, 8 , 6, 4, 2, 1, 0, –1, and –2. At all those light levels in which a camera can reliably and consistently focus, we calculate the average focusing times to plot them on a graph in the test results. Sometimes a camera will become less consistent in dim light—if it does, we mention it in the text. We perform the AF speed test at least 20 times for each light level in the test, though often many more times than that. Once a camera fails to focus at particular light level, we end the test and tabulate the results.