What is Aperture and How it works ????????

Aperture:

    In optics, an aperture is a hole or an opening through which light travels. More specifically, the aperture and focal length of an optical system determine the cone angle of a bundle of rays that come to a focus in the image plane.

Maximum and minimum apertures

    The specifications for a given lens typically include the maximum and minimum aperture sizes, for example, f/1.4–f/22. In this case, f/1.4 is the maximum aperture (the widest opening), and f/22 is the minimum aperture (the smallest opening)


Most important Factor in PRO  Photography:

    The size of the stop is one factor that affects depth of field. Smaller stops (larger f numbers) produce a longer depth of field, allowing objects at a wide range of distances from the viewer to all be in focus at the same time.
For example

this picture clearly shows how lower or higher F numbers affects the Depth of field.



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