I have learned that camera exposure is similar to a water bucket. If you add to much water, you’re overexposing it, if you add you little water you under exposing it. It depends on the shot and if you need to under or overexpose the shot to get the perfect picture. Apture is important when taking pictures, it controls how much light you need. There are different sizes for them, when they need to be wide for a very dark area or when the lens is small for an area that is already bright. Shutter speed controls the durability of the shot when something is too fast to catch with a normal lens. Depending how fast the shutter speed is you can get different effects when you take a picture with it, it also depends on the area because when you use shutter speed it will give you light for your picture. If you are not in the right area for it will be overexposed and ruin the pictures. Lastly iOS speed controls the sensitivity of the camera to adjust to the light that you are trying to take the shot at. iOS speed is basically like the quality of the photo the commonly used iOS speed is 100, 200, 400 and 800. For low noise when using iOS speed, it ranges through 200-50 and for Digital SLR cameras range through 50-800 sometimes it can even go higher if you buy the right camera.