How does Sony SLR A350 measure light? Besides, what is metering for? Xiaobai asks for a detailed answer ... if you answer carefully, you will adopt it.

Photometry, as its name implies, is to measure the intensity of light, that is, the light environment. This function is to measure the light intensity of the subject before taking pictures. With the right metering, you can get the right exposure.

SLR: Single lens reflex imaging, that is, the subject is reflected into your eyes. The biggest advantage of SLR is that what you see is what you get, that is, what you see from the eyepiece is the same feeling, so it is very popular with photographers.

Regarding the correct exposure, there are three parameters to control the exposure, namely the characteristics of SLR, aperture, shutter and sensitivity.

Let me give you a metaphor, which is my understanding of the three.

1. In a closed room without windows, there is a light collector. This collector is the cmos photosensitive chip of SLR camera, which is used for imaging. The color of the photo is collected through this chip. This photosensitive chip can adjust the sensitivity of the chip to light, and the light can be strong or weak.

There is a hole in the wall opposite the photosensitive chip, which can be made bigger and smaller. This is the aperture.

There is a gate on the hole, which can be opened and closed to control the time when the light enters the room, which is equivalent to the shutter of the camera.

The process of getting a photo is that light enters the room from the hole, hits the photosensitive chip on the wall, and then forms a photo. The chip will be exposed for a period of time, and the light will be collected and input into the memory card of the camera. You get a picture. However, the intensity of light hitting the chip must be controlled, otherwise the chip may have insufficient exposure time, or excessive exposure time, the photo will become dark or bright, and many details will be lost. To control exposure, it is necessary to control the size of the camera aperture, the speed of the shutter and the sensitivity of the chip.

1, aperture: from F 1 to F22F 1, the largest F22 is the smallest, which is the hole I mentioned above. The bigger the hole, the more light comes in, and the smaller the hole, the less light comes in.

2. Shutter: Shutter speed, in seconds. There are many gears in your camera. You can set the shutter speed at will from door B, and then set the camera to1101/20 ~1/6000. The last time was six thousandths of a second. The shutter here is above.

3, sensitivity: is to adjust the sensitivity of your chip to light, that is, stimulants, make the chip more excited, feel weaker light, collect, stimulants have side effects, as we all know, so too high sensitivity will also have side effects, the higher the sensitivity, the less clear the photo, and there will be noise (noise is that the photo will have particles visible to the naked eye. ) photos will lose their beauty and can't reflect the details, so don't adjust the sensitivity too high unless you have to, because this will affect the quality of photos.

To sum up, you can understand the function of photometry. The camera measures the light before taking pictures, and then adjusts the aperture size and shutter speed of the camera after measuring the light intensity of the subject, so as to get the appropriate exposure time and aperture size (aperture), so that your photos can be collected on the photosensitive chip normally. To take a good photo, the sensitivity of sensitivity is set according to the shooting environment. 100~ 12800 has the weakest sensitivity, and 100 has the highest sensitivity, but it also has the largest noise.

You don't need to set metering. Just press the shutter half way, but you need to set the metering mode. At present, SLR generally has several metering types, including central key evaluation metering, partial metering and uniform metering. Look at the general knowledge of photography, which is introduced above. Baidu will understand the metering mode. Ask me if you don't understand.