Exposure Triangle
Aperture
The aperture is the size of the camera lenses hole. This controls the depth of field. The smaller the aperture, the larger the number.
This set of photos is an example of aperture and the depth of field. You can see the higher the aperture number, the more in focus the entire shot is (bottom right). Then the top left corner with an aperture of 1.8, only the rose - being the main focus - is focused. This creates a more centred shot and draws the attention to the flower. If you wish to take a photo and do not want any distracting image in the background then the perfect way to take any unwanted attention off the background would be to blur it.
Shutter Speed
The shutter speed is the speed at which the shutter closes. Longer shutter speed will allow more light in, this is good in dark scenes; however long shutter time in light scenes will cause the photo to be overexposed.
These photos are examples of different shutter speeds. From right to left, it shows fast to slow shutter speeds. As you can see the images go from clear to blurry, this is because the slow shutter speed (at the end) taking longer to capture the image, allowing the windmill to move.The problem occurring when taking a photo with a fast shutter speed is that the camera will let in very little light and you will have a dark photo, using flash will help solve this problem. A slow shutter speed will allow more light in. however, the camera will need to be kept very still.
ISO
The ISO controls the quality of the photograph. A ISO of 100 will produce a clear - noiseless image, whereas a higher ISO will make the photo grainy and lower quality.
The ISO is the component of the camera that allows you to control the amount of light you let into the photo. These two photographs are examples of high and low quality photos. The quality of the photos depends on the ISO of the camera. A lower numbered ISO gives a cleaner, better quality photo. If you use a higher ISO it means it will let more light into the photograph but the quality of the image will be a lot worse, the image will be full of noise/film grain.