The focus mode seems simple, but there are many choices. For the choice of focus area and focus, the more the better, because if you need to choose focus, it is more convenient to focus less.

The accuracy of different focus points is different. Generally, cameras have cross focus and universal focus. Therefore, focusing on the focus with the cross of your camera as much as possible is helpful to improve the focusing accuracy.

Under normal circumstances, the single focus of the camera is more accurate, but the pursuit of continuous focus is the problem. You can adjust the value of locked tracking focus to optimize focus tracking performance.

Manual focusing:

Manual focusing is a way to adjust the camera lens by manually turning the focusing ring, so as to make the photos taken clear. This way largely depends on the human eye's judgment of the image on the focusing screen, the photographer's proficiency and even the photographer's field of vision. Early SLR cameras and paraxial cameras basically used manual focusing to complete the focusing operation.

Quasi-professional and professional digital cameras, as well as SLR digital cameras, are equipped with manual focusing function to meet different shooting needs. Focusing is equivalent to focusing, that is, changing the image distance v and satisfying the imaging formula1/u+1/v =1/f, thus forming a clear image on the negative.