Help with ISO

Started May 15, 2013 | Discussions thread
gwlaw99 Senior Member • Posts: 1,113
Re: Help with ISO

TheVyper06 wrote:

I'm sure this has been ask before but I can't find a thread on it, so can someone help explain to me what ISO does?

I haven't really experimented with it much and from what I have researched I still don't understand it well. So if anyone has some insight I would appreciate it.

ISO is the amount of analog gain applied to the data captured by the sensor after exposure.  In other words, the higher the ISO the more brightness.  Think of it as a form of analog post processing.  ISO does not cause noise as much as it reveals noise by making an underexposed image brighter.

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