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Which cup will fill faster?
full!
full!
small opening
big opening
think f/22
think f/2.8
Think about filling a cup with water from your kitchen faucet.
Bigger opening? Less time to fill. Smaller opening? More time to fill.
Light works the same way. A big aperture fills the picture with light fast. A small one takes longer.
How much comes out is aperture. How long you leave it running is shutter speed. How much you need in the cup is ISO.
Previous lesson: ← What Does Aperture Do? ↑ Back to Understanding Exposure Next lesson: What Is Depth of Field? →
