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bugrimmar said:

now i understand! what about depth of field?


Aperture is how much light you let hit the iris of the camera.   Think of it like your pupil in your eye.  The larger the your pupil the more light will be let in, same with the Aperture setting.  But since its a ratio the numbers are flipped, the bigger the number the smaller amount of light that is let in to the iris.  An aperture of 1 is considered a wide open lens, and all light from the shot will hit the iris of the camera.   If a picture is to bright,  you will need to raise the aperture setting to let in less light so its not too bright.  And vice versa if the picture is too dark