Why is it that when you make the aperture on a camera lower, the people’s movements are frozen?

Question by MK: Why is it that when you make the aperture on a camera lower, the people’s movements are frozen?
I thought that when you make the aperture lower the lens opens less wide, restricting the amount of light. I am confused as to why the movements are also ‘frozen’.

Best answer:

Answer by mywaphel
Aperture doesn’t directly affect movement. Shutter speed does. If you stop down (higher aperture number, ex. 32) then you have to use a slower shutter speed. If you open up (lower aperture number, ex. 2.8) then you can use a faster shutter speed.

The faster the shutter, the less motion blur.

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