what does ISO alter on the camera?
ISO is a number that represents how sensitive your camera sensor is to light.
The higher the ISO number, the higher your camera’s sensitivity, and the less light you need to take a picture.
how does a high ISO impact on your photos?
The higher the ISO number, the higher your camera’s sensitivity
higher ISOs can lead to degraded image quality and cause your photos to be grainy or “noisy.”
what’s it meant by visual noise?
everything that is annoying to the eye, from jarring colours to spaces overloaded with home décor objects.
low light situations
in lowlight situations, its often necessary to raise the IISO, so it is able to get a clear photo. however from increasing the ISO, through is that it introduces noise to a image, which makes it appear grainy.
however if you take a photo in ideal light, you can keep the ISO low in order to avoid introducing noise into the images.