The choice of Canon 5d3 focusing (when is it suitable to use multi-point or single point? )

To put it simply: single-point focusing is to highlight the clarity of the subject; Multi-focus is to ensure that the relative area has certain clarity. The following is a detailed introduction:

Single-point focusing: Single-point focusing is to focus directly on a certain part of the subject to highlight the high definition of this part. For example, when we take close-ups of people, you usually use the single-point focusing mode to focus on the people's eyes, which makes the people's eyes very clear and sharp.

Multi-focus: Multi-focus is to aim the selected focus directly at a certain part of the subject to ensure that all subjects in this area are relatively clear. When shooting multiple subjects, this mode should be adopted to ensure that all subjects in the area have relative clarity.