aperture stop


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aperture stop

[′ap·ə‚chər ‚stäp]
(optics)
That opening in an optical system that determines the size of the bundle of rays which traverse the system from a given point of the object to the corresponding point of the image.
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In this case part of the aperture is wasted, exactly as if you put aperture stops over the front lenses.
The power of binoculars

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