Like, for instance, I’ve seen photos of the night sky with crazy details of the stars and they say that this picture was taken with “12 hours exposure”. What does that mean exactly and what does it do?
In: Technology
See it as a sponge in a bucket of water and compare it to light.
If you have a bucket with water and you dip in the sponge like that, the sponge is immediately wet. If you take a camera and point it immediately at the sun, you’ll have a white picture.
If you dip it in really slowly, the sponge will gradually become wetter, until your sponge is sufficiently wet for you to use. If you lower the light intake by the camera, or exposure, you’ll get a picture of the sky with a white/yellow dot on it.
If you have a very dry sponge and a bottom of water, the sponge won’t become fully wet immediately but will take some time to get fully saturated when it has finally absorbed all of the water. This is the same as shooting a picture of the stars. The light of the stars is super dim, so your camera needs more time to absorb the light to show a proper picture.
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