What is the difference between fixed-point focusing and single-point focusing of Canon 5D3? Which focus is it in general?

1 and AF-ON are often called thumb focusing. Thumb focusing is to separate the focus from the shutter, so that focusing with the thumb and pressing the shutter with the index finger can improve the shooting speed and facilitate continuous shooting such as snapshot and snapshot.

2. Press the "autofocus point selection key" (the rightmost key among the three keys on the upper right behind the fuselage), then press the M-Fn key next to the shutter button to make a selection until a focus figure (four braces, up, down, left and right, forming a circle) appears in the middle of the screen, and then press the shutter button to switch to your so-called "automatic follow-up focus mode".

Canon 5D3 focusing system has 6 1 autofocus points, and the camera provides 6 autofocus area modes.

1, fixed-point autofocus.

2. Single point autofocus.

3. Single-point cross extended autofocus.

4. Expand autofocus around a single point.

5, 9 o'clock area autofocus.

6, 6 1 point full area autofocus.

Extended data:

Canon 5D3 shooting suggestion:

When shooting a still life, you can choose a single point or a fixed point to focus, and you can choose a single autofocus mode.

When shooting a fast moving object, the focus can be set to 6 1 point for automatic selection, the autofocus mode can be set to artificial intelligence servo autofocus, and the shooting mode can be set to continuous shooting.

In general shooting, if you use the lens of a ring ultrasonic motor with real-time focusing function, you can set the focal length to 6 1 and the autofocus mode to artificial intelligence autofocus. When shooting, first press the shutter to focus once. If the lit focus is not what you want, you can gently turn the focus ring until the selected focus is lit, and then press the shutter.