CUSTOMISE AF SENSITIVITY
For photographing fast-moving subjects, continuous autofocus can be used to track it, maintaining a focus lock. however, a potential downside to using this mode is that objects within the frame can confuse the AF system into re-adjusting focus incorrectly. use the custom Function menu to reduce its sensitivity to novel objects entering the scene, to limit the risk of losing focus on your intended subject. This is especially applicable in low-light or low-contrast lighting conditions.