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effective aperture

    0.01 sec.
effective aperture [ə¦fek·tiv ′ap·ə·chər]
(optics)
The diameter of the image of the aperture stop of an optical system, as viewed from the object.


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however the point must be made that by doing so, the effective aperture of the reducing lens is increased, as the ray cone from the primary lens is converging and so by projecting the aperture of the reducing lens onto the primary lens, it will have increased.
The end of the cavity-heating region is considered as the blackbody effective aperture for referencing distances.
The depth of field gained is not related to the relative or effective aperture, but is more a function of the smaller size of the image.
 
 
 
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