How does Canon's old SLR camera adjust brightness to make photos brighter?

You can adjust the brightness by adjusting the sensitivity, shutter time and aperture size.

1, the sensitivity can be adjusted, and the influence of sensitivity on photography can be manifested in two aspects. One is speed. Higher sensitivity can get faster shutter speed and be easier to understand. The second is image quality. The lower the sensitivity, the finer the image quality, the higher the sensitivity and the higher the noise. Generally speaking, it is appropriate to keep the sensitivity below 800.

2. Adjust the shutter time, and the shutter speed is in seconds. Common shutter speeds are:11/21/41/811/301/65438+. The longer the shutter time, the more light will enter, but if the shutter time is too long, the jitter will blur the photo.

3. Adjust the aperture size. The smaller the value behind f, the larger the aperture, the more light entering, the brighter the picture, the narrower the focal plane and the greater the blur of the subject background. The larger the value behind f, the smaller the aperture, the less light entering, the darker the picture, the wider the focal plane, and the clearer the front and back of the subject.

Extended data:

1. Under normal circumstances, the larger the aperture, the more light enters, and vice versa. The blade+light hole forms the aperture. The size of the aperture is the size of the aperture, and the movement of the blade will control the size of the aperture, thus controlling the amount of light entering. Water valve = diaphragm blade; Water pipe = smooth hole (maximum aperture); Water flow = light, the amount of light entering the sink.

Tighten the water valve slightly = the lens aperture becomes smaller and the lens aperture becomes smaller; Then the water flow becomes smaller = less light enters the camera. All open water valves = maximum aperture, the largest aperture of the lens; Then the water flow will get bigger = more light will enter the camera. By adjusting the aperture in this way, the amount of light entering the SLR camera can be controlled.

The aperture value is usually expressed by F. In SLR cameras, the larger the number after F, the smaller the aperture, and the smaller the number, the larger the aperture. The size of the aperture is compared with the lens aperture. For example, the middle aperture F8 means that the aperture size of the aperture is 65438+ 0/8 of the lens aperture size, which is simplified and written as F8.

Therefore, the aperture of F2.8 is 1/2.8, which means that the light-passing aperture is the lens aperture, which is definitely larger than the aperture of F22, and is 1/22. So the smaller the aperture number, the larger the aperture.

2. The longer the shutter is opened, the longer the light enters the SLR camera and the more light it enters; On the other hand, the shorter the turn-on time, the shorter the time for light to enter the SLR camera and the less light to enter.

When shooting, the time that the shutter remains open is also the shutter speed. In SLR cameras, the shutter speed is expressed as1100,1125, 1/500, etc.

That is, in 1,100 second shutter = one hundredth of a second shutter speed, that is, the time that the shutter remains open. The longer the shutter stays open, the slower the shutter speed; The shorter the shutter duration, the faster the shutter speed. Because the slower the shutter speed, the more light enters, so1100 shutter is slower than 1/500 shutter. The amount of light will exceed 1/500 shutter.

3. Sensitivity refers to the sensitivity of the photosensitive element of a SLR camera to light. The higher the sensitivity, the more sensitive the photosensitive element is to the light entering the SLR camera, and the brighter the photo will be. On the contrary, the lower the sensitivity, the less sensitive the photosensitive element is to the light entering the camera, and lowering the sensitivity will darken the photo.

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