Suitable for various photographic environments with sensitive values.

It should be said that the choice of sensitivity is a more flexible function of digital camera in controlling ev value than film machine, which makes it easier for DC to choose exposure combination in more occasions and obtain high-quality photos. In places with poor light, such as indoors, you can take pictures with a safe shutter speed (reciprocal x focal length coefficient of lens focal length) without worrying about image jitter.

Only applicable to ordinary dc:

Generally, the O50 is only used when facing a strong light source, or when the light source is enough to obtain an ideal exposure combination (for example, if you want to blur the background and reflect the dragging motion when shooting a windmill on a sunny day, choose the lowest sensitivity+large aperture+lower shutter speed).

и and1000 are mainly used outdoors in sunny days, which is the standard setting.

Generally, O200 is used outdoors on cloudy days, outdoors in dark places and indoors with sufficient light. If you use automatic or A-file shooting, choosing ISO200 is equivalent to increasing the shutter speed by (ISO 100) 1 times, which allows you to get clear images in most occasions. And if you use T file, you can also greatly reduce the concern of underexposure. Outdoor snapshot, sports photography, telephoto lens (due to the increase of safety shutter speed) are all used.

If you have a tripod, most people will still choose ISO 100 and 200 to shoot, but the shutter speed is limited, so it depends on what exposure combination you choose, such as shooting indoor games or using ISO400 or even higher sensitivity.

Above ISO400, it is generally limited to nighttime and indoors without obvious light sources. Professional SLR can get acceptable quality photos in ISO 1600 or even higher sensitivity range, but ordinary cameras are unable to do so.

The above is just the usual situation, and you should use it flexibly when you need to obtain different effects. It is recommended to shoot in A file (aperture first) at ordinary times, which makes it easier to establish an understanding of exposure combination.