Photography

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A place to politely discuss the tools, technique and culture of photography.

This is not a good place to simply share cool photos/videos or promote your own work and projects, but rather a place to discuss photography as an art and post things that would be of interest to other photographers.

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Where does noise really come from? (alien.top)

submitted 10 months ago by VexTheMaster@alien.top to c/photography@viewfinder.pro

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I know, I know, it can be caused by various factors, like high ISO, poor lighting conditions, long exposure time, heat. (not that I know why the last two cause noise)

But where does noise REALLY come from? What is noise? What does it have to do with photons and photosites?

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[–] MyTVC_16@alien.top 1 points 10 months ago

One source: There is always noise from the electrons in the wires, moving about because they have thermal energy. If your signal is weak and you turn up the gain (aka ISO in a digital camera) then it can amplify this noise up along with the signal. The thermal noise can be reduced by cooling the electronics. At absolute zero there would be no thermal noise..