The aperture (or F stop) effects the amount of light let in and it also effects the depth of field. By changing the aperture you can get a number of effects.
In this image we can see a large amount of distance is in focus, this is because of the aperture being small, in this particular image it was F22.
Whereas in this image there is a large aperture, this leaves us with only a very small distance in focus. This leaves us with a very clear indication where the main focus of the image is. This image was taken at F 4.5 but i love taking photographs with wider apertures.
Next up is the shutter speed, shutter speed also affects how much light enters the sensor however the main difference is it affects how much blurring there is. In this first photo i had a very fast shutter speed in order to catch Lewis in mid air and freeze him there.
Whereas a slow shutter speed lets more light in as things move and you often get some fun effects for example it can capture the light trails of cars and if moved correctly you can make one part of the image. In this image i used a slow shutter speed in order to catch Lewis moving down the corridor and it looks pretty damn swag.
The ISO is also a key part of a DSLR, the ISO affects how much light is digitally added in the camera itself. The higher the ISO the lighter the image will be without a flash or altering the shutter speed and aperture but it will also make the image grainier.
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