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• Controls amount of light
• Controls depth-of-field

The diagram above shows the relationship between aperture/f stop and how wide the aperture opens up.As you can see the numbers correspond inversely to the opening of the aperture.

Four simple things to remember:

1. F/1.8 equals to more light and less depth-of-field> coz the aperture of the lens opens really wide, thus a lot of light enters the lens. Less depth of field as only a small section is in focus.
2. F/22.0 equals to less light and more depth-of-field> small aperture lets less light through the lens.
3. 2 second equals to more light and blurs action> the shutter opens for 2 seconds, letting more light through while making a moving object appear a blur as it moves pass the shutter.
4. 1/1000 of a second equals to less light and freezes action> quickly freezes motion and lets a small amount of light through.

How do you pronounce 1/1000 of a second? its pronounced as -one one thousandth of a second, so it just means that its 0.001 sec, which is really fast! So keep that simple maths of fraction you learnt in primary school and sooner or later you’ll get it. happy trying it out guys.