What do EV, s, WB, s, b, v and a mean?

1. EV means exposure compensation.

during exposure, it is usually represented by the combination of shutter speed (t) and aperture value (f). For simplicity, it was once represented by Light Value (LV) and uniformly represented by EV. EV is the abbreviation of English Exposure Values, and it is a quantity that reflects the exposure.

it was originally defined as: when the sensitivity is ISO 1, the aperture coefficient is F1, and the exposure time is 1 second, the exposure amount is defined as , the exposure amount is reduced by one step (the shutter time is reduced by half or the aperture is reduced by one step), and the EV value is increased by 1.

2. ISO is the sensitivity of CCD.

sensitivity, also known as ISO value, is a measure of the sensitivity of negative film to light, which is determined by sensitivity measurement and several measured values, and has recently been standardized by the international organization for standardization. For less sensitive negatives, it takes longer exposure time to achieve the same imaging as more sensitive negatives, so it is usually called slow negatives.

highly sensitive negatives are therefore called fast negatives. Whether it is digital or negative photography, in order to reduce the exposure time, the relative use of higher sensitivity usually leads to the degradation of image quality (due to thicker negative particles or higher image noise or other factors).

3 and s refer to the shutter, that is, the speed.

the shutter is the mechanism used by the camera to control the effective exposure time of the photographic plate. It is an important part of the camera, and its structure, form and function are an important factor to measure the grade of the camera. Generally speaking, the larger the time range of the shutter, the better. Low seconds is suitable for shooting moving objects, and a camera emphasizes that the shutter can reach 1/16 second at the earliest, which can easily catch fast moving targets.

However, when you want to shoot the traffic at night, the shutter time will be lengthened, and the silky water flow effect in common photos can only be taken with a slow shutter.

4. WB refers to white balance.

white balance, literally, is white balance. White balance is an index to describe the white accuracy of the mixed red, green and blue primary colors in the display. White balance is a very important concept in the field of TV camera shooting, through which a series of problems of color reproduction and tone processing can be solved. White balance is produced with the true color reproduction of electronic images, and it was applied earlier in the field of professional photography. Extended information

As we all know, professional SLR cameras have a large phase background, and the photos they take can be enlarged to dozens or even hundreds of times, while mobile phone cameras have a small phase background, so the photos they take are easily blurred when they are enlarged several times, especially when the light is poor, when shooting night scenes or backlighting, the problems such as underexposure or overexposure, heavy smearing and loss of details are even more troublesome.

1. Reduce ISO and use longer shutter time to get more light.

2. A camera with a large pixel photosensitive element (large phase bottom) can get more light.

In fact, both methods are aimed at getting more light into the camera and shooting more details in the same light. However, it is very difficult to maintain stability when shooting with a slow shutter, so a mobile phone camera with a larger pixel sensor is a better choice.

Baidu encyclopedia -ISO

Baidu encyclopedia -EV value

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Baidu encyclopedia-white balance.