A photograph's exposure determines how light or dark an picture will appear when it is been captured by your camera. Think it or not, this is determined by camera settings: aperture, ISO & shutter speed (the "exposure triangle"). Mastering their use is an essential part of developing an intuition for photography.

In photography, the exposure settings of aperture, shutter speed & ISO speed are analogous to the width, time & quantity discussed above. Furthermore, as the rate of rainfall was beyond your control above, so is natural light for a photographer.

Achieving the correct exposure is a lot like collecting rain in a bucket. While the rate of rainfall is uncontrollable, factors stay under your control: the bucket's width, the period you leave it in the rain, & the quantity of rain you need to collect. You need to make positive you don't collect small ("underexposed"), but that you also don't collect much ("overexposed"). The key is that there is lots of different combinations of width, time & quantity that will accomplish this. For example, for the same amount of water, you can get away with less time in the rain in the event you pick a bucket that is wide. Alternatively, for the same period left in the rain, a very narrow bucket can be used as long as you plan on getting by with less water.
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