Aperture

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Behind the lens of your digital camera is a diaphragm that opens and closes to determine the amount of light falling on to the CCD/CMOS sensor or film. By altering the aperture, you can also change the depth of field.

Common f-stops are as follows (all spaced by a full stop):

            f/1,  f/1.4,  f/2,  f/2.8,  f/4,  f/5.6,  f/8,  f/11,  f/16, f/22, etc