DSLR Camera Controls
ISO- The relative speed of sensitivity that we set to the camera- can tell the camera to respond to lower light levels when the ISO is higher, which allows more light in. This isn't always a good thing as the higher the ISO is, the more 'noisy' or grainy the picture is, which can significantly make the image worse quality.
Shutter speed- This is used to control movement, as it is the amount of time you give the camera to see the scene you are trying to capture. Shutter speed is measured in fractions of a second and typically 1/60th of a second is used as faster speeds will result in a blurred result if your camera moves.
High shutter speeds can be useful when trying to take pictures of things that slow shutter speeds wouldn't capture; such as bubbles.
Aperture- Simply known as 'The opening of the lense'- the size of the aperture can let more or less light in. Aperture is measured in 'F- Stops' and the larger the amount of light, the smaller the number (e.g. F/1.4) and the smaller the amount of light, the larger the number (e.g. F/22)
The other thing aperture impacts on is depth of field, as a large aperture such as 1.4 will have the front subject in focus but the background blurred, and a small aperture such as 22 will have everything in focus.
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