Aperture has a couple of different meanings depending on the context, but it is most commonly associated with photography and optics. Here are the main definitions: 1. **Photography**: In photography, aperture refers to the size of the opening in a lens through which light passes. It is one of the three critical elements of exposure, alongside shutter speed and ISO. Aperture is usually measured in f-stops (f/numbers), where a lower f-stop (e.g., f/1.
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