How to calculate aperture and shutter speed in photography

Simple calculation formula: exposure = aperture * shutter time.

It can be seen from the formula that the larger the aperture, the shorter the shutter time under the condition of constant exposure. For example, the aperture is 5.6 and the shutter speed is 1/60. When the aperture becomes 8, the shutter speed should be 1/30 seconds.

Shutter speed is an important parameter of digital camera shutter, and the shutter speed of different models of digital cameras is completely different.

Therefore, when shooting a scene with a certain type of digital camera, we must first know the shutter speed, because only by considering the start time of the shutter and grasping the release time of the shutter can we capture a vivid picture.

Extended data

Aperture is a device used to control the amount of light entering the photosensitive surface of the fuselage through the lens. Usually in the camera. The expression pore size is expressed by F/ value.

Aperture f value = lens focal length/lens effective aperture diameter. As can be seen from the above formula, to achieve the same aperture f value, the aperture of a long focal length lens is larger than that of a short focal length lens.

The complete series of aperture values is as follows:

f/ 1.0，f/ 1.4，f/2.0，f/2.8，f/4.0，f/5.6，f/8.0，f/ 1，f/ 16，f/22，f/32，f/44，f/64 .

Baidu encyclopedia-aperture

Baidu encyclopedia-shutter

Baidu encyclopedia-shutter speed