How do novices set ISO parameters in different situations?

If you want to know what kind of ISO value is needed under what circumstances, you must first know its influence on shooting.

First, what is the sensitivity (ISO)ISO controls the brightness of photos. Unlike aperture and shutter, shutter and aperture both control the amount of light entering, and the sensitivity is to improve the sensitivity of camera photosensitive elements. The lower the sensitivity, the darker the photo; The higher the sensitivity, the brighter the photo. However, with the increase of sensitivity, the more noise there will be in the photo, and the image quality will decline.

Second, the influence of sensitivity on shooting. Improving ISO can improve the brightness of the picture.

The larger the ISO number, the more sensitive it is to light and the higher the exposure of photos. In order to get the best imaging quality, we should use low ISO shooting as much as possible. However, if the light is not good, using low ISO will lead to slow shutter speed, and if there is no tripod, it will easily lead to blur. In order to avoid this situation, we can use high ISO shooting when necessary to make the photos clear.

high sensitivity

Low sensitivity

2. High sensitivity will bring noise problems.

The noise is mainly due to the tiny particles produced by the electronic image sensor in the process of receiving light and converting it into electrical signals, and these particles are usually caused by electronic interference, but the main body does not.

Generally speaking, the amount of noise is also related to the length of exposure time. The longer the exposure time, the more noise. When using high sensitivity, if the exposure time is reduced accordingly, the noise will not be too serious, and many cameras have automatic noise reduction function.

Three. ISO setting of portrait shooting in common shooting scenes

It is best to adjust the aperture to f5.6 or more, with a small depth of field and a prominent subject. The distance should be adjusted according to the needs of bust, whole body or local close-up. In the case of sufficient light during the day, the sensitivity should be set at around 100, and the maximum should not exceed 400.

Night scene shooting

Use a tripod or put it on a fixed object (steps, stools, etc.). ). The camera uses gear (aperture priority), the white balance is set to automatic or incandescent mode, and the aperture is set to f8 or even number. ISO should be controlled within 200, and the shutter speed should be slowed down to extend the exposure time appropriately to prevent passers-by from entering the screen.

Night character shooting

Use tripod, set automatic white balance, ISO is within 100-400, gear A and aperture are around f8. Use slow synchronous flash. When the shutter is pressed, the flash flashes once and flashes again before the end of exposure. During shooting, the subject does not leave the line of sight.