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Brief facts about aperature:

In optics, the aperture of an optical system is a hole or an opening that primarily limits light propagated through the system. More specifically, the entrance pupil as the front side image of the aperture and focal length of an optical system determine the cone angle of a bundle of rays that comes to a focus in the image plane. An optical system typically has many openings or structures that limit ray bundles. These structures may be the edge of a lens or mirror, or a ring or other fixture that holds an optical element in place or may be a special element such as a diaphragm placed in the optical path to limit the light admitted by the system. In general, these structures are called stops, and the aperture stop is the stop that primarily determines the cone of rays that an optical system accepts. As a result, it also determines the ray cone angle and brightness at the image point.

Numerical aperture - In optics, the numerical aperture of an optical system is a dimensionless number that characterizes the range of angles over which the system can accept or emit light.

Antenna aperture - In electromagnetics and antenna theory, antenna aperture, effective area, or receiving cross section, is a measure of how effective an antenna is at receiving the power of electromagnetic radiation.

Angular resolution - Angular resolution describes the ability of any image-forming device such as an optical or radio telescope, a microscope, a camera, or an eye, to distinguish small details of an object, thereby making it a major determinant of image resolution.

Diaphragm (optics) - In optics, a diaphragm is a thin opaque structure with an opening at its center. The role of the diaphragm is to stop the passage of light, except for the light passing through the aperture. Thus it is also called a stop.

Waterhouse stop - The Waterhouse stop or Waterhouse diaphragm is an interchangeable diaphragm with an aperture for controlling the entry of light into a camera.

Bokeh - In photography, bokeh is the aesthetic quality of the blur produced in out-of-focus parts of an image, caused by circles of confusion. Bokeh has also been defined as "the way the lens renders out-of-focus points of light".

Physical optics

Geometrical optics

Science of photography

Observational astronomy