India Point Park

India Point Park
by matt-ball                

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Sep
24
awarded  Autobiographer
Jan
11
awarded  Yearling
May
27
awarded  Supporter
Jan
15
awarded  Nice Answer
Jan
14
comment Why do digital cameras need an exposure time at all?
@BlueRaja-DannyPflughoeft, the fundamental reason is what Phil said --- you have to wait for enough photons to arrive to create a low noise image. It basically comes down to the same thing for electrons. On the electronics side, it's also true that our methods for measuring current generally require converting them to voltage first.
Jan
11
comment Why do digital cameras need an exposure time at all?
@Phil, I think the final para of your answer, where you focus on having to wait for the actual photons to arrive, actually gets to the fundamental limit of why we need non-zero exposure time. I was just trying to hit the key misunderstanding I saw in the OP's premises about the question.
Jan
11
awarded  Teacher
Jan
11
answered Why do digital cameras need an exposure time at all?