From the course: Photography Foundations: Mobile Photography

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Exposure basics: Aperture

Exposure basics: Aperture

From the course: Photography Foundations: Mobile Photography

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Exposure basics: Aperture

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- The human eye doesn't have a shutter but most people can detect individual flashes of light as short as 1/100 of a second. In some situations, that can go as fast as 1/250 of a second, but you can make a reasonable argument that the human eye can perceive slices of time as short as 1/100 of a second, which is kind of like havin' a shutter speed. But your eye does have another mechanism for controlling exposure. In the center of each of your eyes is the pupil, or iris, which gets bigger or smaller, depending on how much light your eyes are exposed to. In low light, your pupils will get very large to allow more light to enter. In bright light, they will get very small. Now when we say that we're giving our eyes time to adjust when we step inside a dark building from a brightly lit sidewalk in the afternoon, what we mean is that we're waiting for our irises to get to an appropriate size. Now there's some other stuff…

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