Photography shutter speed and aperture

1, the aperture size is directly proportional to the shutter speed, and the larger the aperture, the faster the shutter speed;

2. Under the premise of maintaining normal exposure (or constant luminous flux), the aperture is increased by one gear, and the shutter is also accelerated by one gear, and so on;

3, "lens speed" does not have this name, it should be autofocus speed;

4. The larger the aperture, the slower the autofocus speed. Because the larger the aperture, the shallower the depth of field and the higher the focusing accuracy, the higher the lens displacement accuracy automatically driven by the body motor (or mirror motor) and the more time it takes;

5. In general, the larger the aperture, the slower the autofocus speed. However, due to the different research and development technologies and motor types of lenses, it is impossible to measure or convert by how much the aperture increases or how much the focusing speed slows down. Except some large-aperture lenses have obvious slow-focus shooting experience (such as 85mmF 1.4/F 1.8 fixed-focus lenses), the focusing speed of most large-aperture lenses is only reflected in laboratory data, which is difficult to perceive in real shooting.