Handling: How to choose the right ISO for SLR photography?

The choice of ISO for digital cameras is the same as that for film sensitivity. As long as the light conditions permit, try to shoot with low sensitivity, because the photos taken with low sensitivity are fine and noiseless (film photos are fine), with high color purity, and sharpness, resolution and contrast are the best performances. High ISO is a compromise choice. Although the current technology is advancing by leaps and bounds, the availability of high sensitivity is getting higher and higher, but strict advertising photographers or photographers who have high requirements for pictures rarely use high sensitivity.

Of course, words can't be so absolute. Although there is still a smear phenomenon in high sense, it is of great positive significance to record breaking news and time when it is used for online communication or in complex environment and light.