A camera lens also known as photographic lens or photographic objective is an optical lens or assembly of lenses used in conjunction with a camera body and mechanism to make images of objects either on photographic film or on other media capable of storing an image chemically or electronically. Numerical aperture is not typically used in photographyInstead the angular aperture of a lens or an imaging mirror is expressed by the f-number written f or N which is defined as the ratio of the focal length f to the diameter of the entrance pupil D.
The Importance Of A Focal Point
There is no major difference in principle between a lens used for a still camera.
. This ratio is related to the image-space numerical aperture when the lens is focused at infinity.
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