ISO

In the flash photo you have a normal outcome. Its not to bright and not to light, it looks like any other picture you would take. In the ISO 50, the subject is really dark but you kind of see the background lights pretty good. So it would be best used if you are taking pictures of some kind of background that has lights. And in the ISO 5000, the background and subject is extremely bright and pixilated. you would use this one if it was extremely dark and you were going to be able to still have a nice picture, so that it won't be really bright.