Digital SLR camera problems, camera focus points, such as 5 1 focus, 6 1 focus, what's the use of taking pictures?

Simply put, focusing is used to facilitate composition, so that the main body of the picture can be accurately focused at any position.

For example, you are photographing a butterfly flying among flowers. From the viewfinder, the butterfly flies from the lower left to the upper right; You use the continuous shooting model; A * * * took five photos, and the butterfly wings in each photo were clearly taken; That's why multifocus can work.

That is to say, when the scene (flower) is still, when the subject (butterfly) moves to any position on the screen, the multi-point focusing function makes the focus move with the subject, and it will always focus on the subject no matter how the subject moves in the screen.

Multi-focus system is particularly important when shooting moving objects.