ISO aperture; What does the shutter speed matter? What effect will it have on the photos?

ISO is sensitivity. When the ISO is high, photos need less exposure.

Aperture controls depth of field. The larger the aperture, the shallower the depth of field and the greater the luminous flux.

The faster the shutter, the clearer the image, but the smaller the luminous flux, the slower the shutter and the larger the luminous flux, but it is easy to produce noise.

The combination of aperture shutter ISO depends on the subject you want to shoot. For example, if you want to take a close-up of a person and blur the surrounding objects that affect the composition, you should open a large aperture to achieve a shallow shadow depth (telephoto also has a shallow shadow depth effect). For example, if you want to shoot a landscape, you need most of the details in the picture to be clear, so you need to use a small aperture to get a greater depth of field. Large aperture is also commonly used in low light environment. When the shutter matches the aperture, it should be noted that when shooting manually, the focal length of 50mm is not less than 1/60, which is a safe shutter. If it is lower than 1/60, the picture is easily burnt out due to jitter. Under 1/60, you need tools such as tripod to help. Of course, when shooting dynamic ideas, it is another matter. When the exposure combination you want cannot be photographed by hand, you can raise the ISO value. Generally, a higher ISO is needed in low light environment, but if possible, the ISO should be adjusted to 100, because the higher the ISO, the more serious the noise. Generally speaking, in order to obtain good image quality, you should try to choose the lowest ISO allowed.