Problems with shutter and aperture device.

1, shutter position: door b, 30s, 15s, 8s, 4s, 2s, 1s, 1/2s, 1/4s, 1/5s,/kloc. 1/250, 1/500,11000, 1/2000, 1/4000, 1/8000 and so on 2. Please look at answer 3 first. Other conditions being the same, if the shutter is raised by one step, the luminous flux will be halved. Other things being equal, if the aperture value is one step ahead (that is, the aperture is reduced), the luminous flux will be halved. It can be seen that when other conditions remain unchanged, when the exposure is correct, the shutter is raised by one step and the aperture value is lowered by one step (that is, the aperture is enlarged) to ensure correct exposure. For example, in the same environment, F2.8,111000s is correctly exposed. Now, if you want to reduce the aperture to F4 and halve the light intake, you have to slow down the shutter speed by one step and increase the light intake to 1/500s. 3. The relationship between two adjacent aperture stops is that the light input is doubled, that is, the light input of the former, such as F2, is twice that of the latter, F2.8.4.. ISO is related to shutter and aperture. Every time the sensitivity is doubled, the sensitivity of the photosensitive element to light will be doubled, and the shutter speed will be doubled or the aperture will be reduced by one step. For example, F4 ISO 100 and 1/30s are correct exposures for the same environment. Now I have raised the ISO value to 200 and doubled the sensitivity. If I want to expose correctly, in the first case, when the aperture is constant, the corresponding shutter speed will be accelerated to reduce the amount of light entering, so I will adjust it to 1/60s. In the second case, if the shutter is unchanged, the corresponding aperture will be reduced by one step, that is, the aperture value will be increased by one step to reduce the amount of light entering, so it is necessary to adjust it to F5.6. If you feel dizzy, make the light clear. The larger the aperture (the smaller the aperture value), the more light will enter. The faster the shutter speed, the smaller the light input, which is inevitable; The slower you are, the more light you get. Both of them are easy to understand, aren't they? The higher the ISO value, the more sensitive it is to light, which can be roughly understood as an increase in the amount of light entering. Although this understanding is not accurate, it is a simple way to remember the relationship between values.