Aperture, Light, and Depth of Field

Front

Aperture size

Back

Diameter of the lens opening

Front

Large aperture

Back

More light enters, smaller f-number

Front

Small aperture

Back

Less light enters, larger f-number

Front

f-stop

Back

Unit to measure aperture size

Front

Full stop

Back

Doubling or halving light transmission

Front

f/2.8 to f/4

Back

One full stop, half the light

Front

f/8 to f/5.6

Back

One full stop, double the light

Front

Depth of Field (DOF)

Back

Zone of sharp focus in an image

Front

Large aperture effect on DOF

Back

Shallow depth of field

Front

Small aperture effect on DOF

Back

Greater depth of field