One of the most confusing settings is ISO, which is one of the three factors of exposure, along with shutter speed and aperture.
In Digital Photography ISO measures the sensitivity of the image sensor. The same principles apply as in film Photography – the lower the number the less sensitive your camera is to light and the finer the grain. ... By choosing a higher ISO you can use a faster shutter speed to freeze the movement.When you change the ISO on a digital camera, you’re rendering the sensor more or less sensitive to light. Digital cameras typically have ISO settings that range between 100 (low sensitivity) to 12,800 or greater (high sensitivity). Compact cameras and camera phones may top out below that, however, and some interchangeable lens cameras with larger sensors go even higher, reaching ISO levels in the hundreds of thousands.
Beyond simply changing the exposure, ISO also affects image quality. A higher ISO typically translates to a noisy or “grainy” image, just as a higher ISO film has more grain than one with a lower ISO. The picture below showcases how ISO can directly impact image quality, though, keep in mind that the particular noise levels depend on the camera. A lower ISO won’t just make less noise, however. It will produce better color and dynamic range, which is the ability of the camera to capture detail in both highlights and shadows. Therefore, it is generally recommended to keep ISO as low as possible in order to get the highest quality output from your camera. High ISO allows you to shoot at faster shutter speeds, smaller apertures, or in darker conditions. This results in increased noise, however, and a general loss of detail.
How much light is needed is determined by the sensitivity of the medium used. That was as true for glass plates as it is for film, and now digital sensors.
Found this on the internet.
ISO Photos:
Best Photo:
Worst Photo:
I chose these photos for my best and worst photo's as, the worst photo Is white as it was on 1600 on the ISO. However, I chose this as my best photo as It shows the difference from 1600 to auto/100 ISO.