When we talk about exposure, really all we’re asking is how bright or dark a photo is. Too bright and we say that it’s over exposed - it’ll have lots of white patches in the photograph which are lacking in detail. If, on the other hand, the picture is too dark with lots of dark patches similarly lacking in detail we say the photograph is under exposed.
So our challenge as photographers is making sure that we take correctly exposed photos every time. Cameras have three settings that affect the exposure of a photograph: Aperture, Shutter Speed and ISO.
They are all linked through the Exposure Triangle:
Keep scrolling down for information about Aperture, Shutter Speed, ISO and more!