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Limiting aperture.
The actual size of the aperture formed by the iris diaphragm at any setting. Determines, but usually differs from, the eflfective aperture.
Long-focus. ...
Entrance Pupil The apparent size of the limiting aperture of a lens or lens system (properly that of the diaphram), as seen from the object plane. This can shift and become a complex matter in some circumstances.
 See also: F-number, Focus, Iris diaphragm, Shape, Flash
  
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