Learn how to set up and use Aperture. Find all the topics, resources, and contact options you need for Aperture. Aperture is one of the most fundamental aspects of exposure. It can affect so many different variables of an image, that it is important to know all about it. Read this article to learn about aperture and how to use it. Aperture is one of the three factors which affect exposure, and it's the first step to taking better photos. It's easy to understand, and take advantage of. An opening, or the area of a lens, through which light can pass. Angular aperture Half of the maximum plane subtended by a lens at the axial point of an object or image. (Sometimes the full plane angle is taken as the angular aperture but this is not convenient in optical calculations.) See. Aperture of a lenticular lens That portion of a lenticular lens which has the prescribed power (British Standard). Numerical aperture An expression designating the light-gathering power of microscope objectives. It is equal to the product of the index of refraction n of the object space and the sine of the angle u subtended by a radius of the entrance pupil at the axial point on the object, i.e. Palpebral aperture The gap between the margins of the eyelids when the eye is open. An abnormal increase in the aperture occurs in some conditions, including Graves' disease, buphthalmos, Parinaud's syndrome and retrobulbar tumour. An abnormal decrease in the aperture occurs in some conditions, including ptosis, microphthalmos and ophthalmoplegia (Figs. A15 and A16). Interpalpebral fissure (this term is more accurate although used infrequently); palpebral fissure. Aperture plane See aperture plane. Aperture ratio See. Relative aperture The reciprocal of the f number. It is therefore equal to the ratio of the diameter of the entrance pupil to the primary focal length of an optical system. Aperture ratio. Note: the definition of this term is not universally accepted; some authors define it as the reverse of the above.
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