How to use the ISO value of the camera?

ISO means the speed of film exposure in traditional cameras. Usually we can clearly see the ISO value on the used film packaging, such as ISO 100, ISO 200, ISO 400 and so on. , extended to digital cameras, equivalent to CCD photosensitive speed. By adjusting the ISO value, the photosensitive sensitivity of CCD can be changed. The higher the ISO, the faster the photosensitive speed of CCD. In other words, under certain exposure conditions, the higher the ISO, the shorter the exposure time.

The higher the ISO, the more obvious the graininess of photos. For film, graininess is caused by the chemical changes of silver halide during rapid exposure, while for digital cameras, noise is caused by uneven pixel exposure caused by CCD rapid exposure. In this way, a higher ISO setting is not suitable for pictures with higher quality requirements, especially portrait photography, still life shooting, close-up and so on.

Therefore, when setting ISO, we should use it flexibly, which is also a big advantage of digital cameras. Free play, even a small entertainment digital camera, I believe it will certainly give full play to its maximum performance and take excellent photos.