Research compares the triangle spread function from square and circular apertures, suggesting implications for optical performance.
In this research: the triangle spread function (concluded from pupil function technique) has been regarded, to find image intensity from triangle object in optical system includes square aperture to compare with concluded values from (2.). The results shown that the square aperture contributes little Improvement on resolving power, and increases the depth of focus.
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A.B. Hassan (2005) studied this question.
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