Shutter speed, Aperture and ISO
Three pillars of photography
• Shutter speed
Balance of all three
The shutter blocks all light from exposing the image sensor (or film) until you
press the button. Then it quickly opens and closes, exposing the image
sensor with a flash of light.
You can control the length of time the shutter remains open by setting the
• Longer the shutter speed = more light (brighter image) and more
• Smaller the shutter speed = less light (darker image) less motion blur
Before the light reaches the image sensor it passes through an opening
called an aperture.
The Aperture is like a pupil.
You control the aperture by adjust the opening also called the f-stop
• Smaller F-stop number = larger opening for more light (brighter image) and
shallower depth of field
• Larger F-stop number = smaller opening for less light (darker image) and
greater depth of field.
ISO is the level of sensitivity that your
camera (image sensor) to available
The lower the number the less
sensitive to light it will be.
Always try to stick with your cameras
base ISO level for better quality