What is “exposure”?

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Bob Senior Member • Posts: 1,240
What is “exposure”?
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I’m picking up on the other thread about shutter speed for landscape photos.  There were some interesting comments regarding “exposure” vs “lightness/darkess”.

I do get the fact that there are two separate phenomena.  One, is the amount of light hitting the sensor (or film).   The other is the resulting lightness or darkness of the image.

So, theoretically, “exposure” can’t be changed in post processing, because the shot was already taken and the photos have already been recorded.  But one could certainly change the lightness - obviously.

So, would it be fair to say that aperture and shutter speed affect exposure, whereas simply changing ISO (holding other factors constant) does not change exposure (only changes lightness)?

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