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
In the older film type cameras, exposure is the time that the film is exposed to the scene that it is supposed to capture. The same concept is used for digital photography. In older cameras the shutter on the camera opens then quickly shuts (results in the distinctive sound of cameras). If a high speed event is captured, this exposure time is very low to avoid blurring.
Sometimes, to capture stars or low light events a long exposure is needed although the subject and camera must be still – pre digital age. This can be used to make special effects like the stars making an arc through the night sky. Or a longer exposure to deliberately have a “motion blurring” effect
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