Resolution of shape of self-radiant line elements by objectives of Sonine types Sν is stated quantitatively as the ratio Rs of length to width of a uniquely chosen contour of constant irradiance in the diffraction image. This contour passes through the point xs of steepest slope of the irradiance H(x) along the length x of the geometrical image. Computations are included of the resolution factor Rs as a function of the half-length K (in Airy units) of line elements imaged by objectives of types S0, S1, and S2. Type S0 excels type S1 (identical with the Airy type) for resolving shape. In turn, the apodized type S2 is inferior to type S1.
© 1964 Optical Society of America
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