How to use lock focus?

Auto focus, like auto exposure, is usually completed when the shutter is half pressed. However, autofocus needs a good reference for focus coincidence comparison, otherwise autofocus will be slow or fail. We often encounter situations where the camera can't focus on monochrome or flat objects, or the slow focus leads to many wonderful pictures being missed. At this time, if the focus lock function is adopted, this phenomenon can be avoided. The specific usage of locking focus is that when shooting can't complete autofocus, you can focus on the object at the same distance, then press the focus lock key to lock the focus value, then aim the lens at the picture to be shot, measure the light according to the picture, and then finish shooting. In addition, when shooting sports themes, if the camera can't quickly complete autofocus when facing a fast oncoming object, it can wait to focus on the motion trajectory of the object in advance, and when the object moves to the reference position, press the shutter decisively to complete shooting. I hope the above information can help you. For more photography skills and camera product Q&A, please pay attention to Zhongguancun Online-Camera Q&A Hall. For more questions about digital influence, you can go to Zhongguancun Online-Digital Photography Forum to share.